RESUME OF PAUL L.G. VLEK PERSONAL DATA NAME: Paul L.G. Vlek BIRTH DATE: January 2l, l948 PLACE OF BIRTH: Amsterdam, The Netherlands CITIZENSHIP: Dutch, Green card holder MARITAL STATUS: Married, two children WIFE: Melissa Ann Vlek-Gentle, RN, American LANGUAGES: Read, Write and Converse in Dutch, English, German, and French EDUCATION DEGREE SCHOOL LOCATION MAJOR Ph.D. (l976) Colorado State Fort Collins, Soil Chemistry University Colorado Plant Nutrition M.S. (l972) State Agric. Wageningen Soil Chemistry University The Netherlands Tropical Soils DISSERTATION Ph.D. "Chemistry, Mobility, and Availability of Molybdenum in Colorado Soils" PUBLICATIONS Over 200 scientific contributions in refereed Journals. See attached list. EMPLOYMENT RECORD March 2015 – September 2015 Interim Deputy Director General- Research. International Center for Agriculture in the Dry Areas (ICARDA), Amman, Jordan. April 2010 to March 2014 Founding Executive Director West African Science Service Center on Climate Change and Adapted Land Use (WASCAL), Accra, Ghana. Established WASCAL as an International Institute of West African States, including programs, staff and infrastructure. (www.wascal.org) April 1998 to April 2015 Full professor and Director, Dept. of Ecology and Natural Resources of the Center for Development Research (ZEF-Bonn) at the University of Bonn, of which 7 years as Executive Director. ZEF-Bonn (established in 1997), is an inter-disciplinary research and teaching institute (Ph. D. level, with 120 students at any one time ranging from social science to economics and environmental sciences) concerned with global change and sustainable development issues. Member of the Faculty of Agriculture as well as the Faculty of Sciences. The Center has an annual budget of $ 10 million, 20% of which is core funding. (www.ZEF.de)

January 1997 to April 1998 Initiator and speaker (PI) of the Special Research Institute (SFB 1687) related to the "stability of the tropical rainforest margin", involving 20 colleagues from University of Göttingen and Kassel and 20 counterpart professors from the University of Bogor and Palu, Indonesia. April 1994 to April 1995 Dean, Faculty of Agriculture, Georg-August-University. Rotational appointment. Responsible for 11 institutes and 4 experiment stations with 47 Full-Professor positions and 300 scientific and support staff members. Ultimate responsibility for research and teaching as well as administrative and financial management. The faculty also maintains a Center for Tropical Agriculture and a Center for Agriculture and the Environment. In charge of developing a strategic plan "2000+" and restructuring of the school of Agriculture including the transition to the B. Sc. /M. Sc. curriculum. June 1990 to April 1998 Full Professor and Director, Institute of Agronomy in the Tropics, Georg-August-University, Goettingen, Germany. Tought courses in Tropical and Subtropical Agroecology and Food and Horticultural Crop Production, and led the institute with six permanent staff members and about 15 Ph.D. students employed in various collaborative projects overseas. The Institute addresses aspects of sustainable agriculture and natural resource management. August 1986 to June 1990 Director, International Fertilizer Development Center, Africa. Established a new center for fertilizer development to serve sub-Saharan Africa with Headquarters in Togo. Responsibilities included program development, fund raising, staffing, governmental liaison, and general administration and management. The Center serves as a branch of IFDC and reached a budget of over US$ 4 million/year from 9 donors and 25 international staff members. Programs involve research, training and technical assistance covering all aspects of the fertilizer sector. December 1976 to August 1986 Soil Scientist, Research Leader and from 1984 Director, Agro-Economic Division. Developed and managed research programs in the areas of soil science, economics, sociology, related to fertilizers and food production. Collaborative projects were developed in Asia, Africa and Latin America, mostly with Centers of the CGIAR. Discovered the benefits of Urea Deep Placement in flooded rice, a technology currently adopted on over 2 million ha in South and Southeast Asia. The Agro-Economic Division comprised a total of 23 Ph.D. staff members, located at various CGIAR centers and at Headquarters. PROFESSIONAL ACTIVITIES & HONORS - Honorary Doctorate of Science. Federal University of Technology, Akure, Nigeria, 2014 - Adjunct Professorship at the National University (NUI) Galway, Ireland, in the Discipline of Botany and Plant Sciences, School of Natural Sciences, College of Science. 2014 - UNESCO Professor for Education in Sustainable Development in Central Asia, El Khoresmy State University of Urgench, Uzbekistan, 2011- 2016 - World Agricultural Prize Laureate 2014 for excellence in engagement in the mission of higher

education institutions relating to the agricultural and life sciences (http://www.gchera.com) The Global Confederation of Higher Education Associations for Agricultural and Life Sciences (GCHERA).

- Recipient of the National Energy Globe Award Uzbekistan 2013 ( http://www.energyglobe.info/) - Breheny Prize co-winner for best paper 2013 in Environment and Planning B: Planning and Design Vol 40: pages 574-575 - Co-recipient of the 1993 prize for international university cooperation between the University of Bogor

and the University of Göttingen. Awarded by the Council of University Presidents, Germany - Fellow, Stellenbosch Institute of Advanced Studies, Stellenbosch, South Africa (2013) - Member of the Northrhine-Westphalian Academie of Art and Sciences (2010) - Fellow, Soil Science Society of America (2008) - Fellow American Society of Agronomy (2004) - Fellow, Indian Academy of Agricultural Sciences (2003)

- Member Selection Committee “Robert Bosch Foundation Junior Professorship: Research into the Sustainable Use of Natural Resources. (2008 - )

- Member Standing Panel for Monitoring and Evaluation of the Science Council, CGIAR. (2006- 2010) - Member Evaluation Committee Helmholtz Scientific Society, Germany (2003) - Chair of the CGIAR External Program Review Committee (EPR) of ICRISAT (2003) - Member of the CGIAR Review Panel for the Sub-Saharan Africa Challenge Program (2006) - Chair Division A6, American Society of Agronomy (2003/2004) - Member/treasurer Scientific Committee, International Human Dimension Program (IHDP). (2002 -

2006) - Member National Committee on Global Change Research, Ministry of Science, Germany (2003 -2008) - Member National Science Advisory Committee, Ministry of Development Cooperation, Germany (2005-

2009) - Member Jury of the Eiselen Foundation Price (Joseph Knoll) (2000-2010) - Member Evaluation Committee of “Plant Science International”, and “Plant Research Institute”

Wageningen, The Netherlands (2001/2006) - Member of selection committee for Ph. D. scholars from Africa. German Exchange Service (DAAD)

(1995 – 2006). - Member Evaluation and Selection Committee 2005 CGIAR Science Awards - Member Advisory Board for International Agricultural Research (BEAF), Ministry of Development

Cooperation, Germany (1995-2003) - Elected member of the University Senate, Georg-August University, Goettingen, Germany (1995-1997) - Member of the Board of Directors (Kuratorium), German Foundation for Development (DSE) (1995 -

2001) - Board member "Centro Internacional de Agricultura Tropical" (CIAT), Cali, Colombia (1992-1997) - Member of the International Advisory Board of the C.T. de Wit Graduate School of Production Ecology.

Wageningen Agricultural University (1994-2004) - Consultant to the World Bank in Rwanda, Madagascar and Burundi (1986/87) - Member evaluation committee of the Science Technology and Development (STD2) program (100

million ECU) of the European Community - Editor in Chief of "Fertilizer Research", now: „Nutrient Cycling in Agroecosystems“ Springer Publ.

(1990- 2013) - Associate Editor of "Agronomy Journal", American Society of Agronomy (l98l-l986) - Editor of Applied Botany (1991-2006 ) - Editor of Basic and Applied Ecology (2000 -2012 ) - Editor of Agronomy and Crop Science (1993 - 2000)

- PUBLICATIONS

1. Vlek, P.L.G., Th.J.M. Blom, J. Beek, and W.L. Lindsay. 1974. Determination of the Solubility Product of Various Iron Hydroxides and Jarosite by the Chelation Method, Soil Science Society of America Proceedings 38 (3): 429-432.

2. Vlek, P.L.G., and W.L. Lindsay. 1977. Thermodynamic Stability and Solubility of Molybdenum Minerals in Soils, Soil Sci. Soc. Am. J. 41: 42-46.

3. Vlek, P.L.G., and W.L. Lindsay. l978. Potential Use of Finely Disintegrated Iron Pyrite in Sodic and Iron-Deficient Soils, Journal of Environmental Quality 7: 111-114.

4. Lindsay, W.L., and P.L.G. Vlek. 1977. Phosphate Minerals, In: Minerals in Soil Environments, p. 639-670, J.B. Dixon and B.S. Weed, Eds., Soil Sci. Soc. Am., Inc., Madison, Wisconsin.

5. Vlek, P.L.G., and J.M. Stumpe. 1978. Effects of Solution Chemistry and Environmental Conditions on Ammonia Volatilization Losses from Aqueous Systems, Soil Sci. Soc. Am. J. 42: 4l6-421.

6. Vlek, P.L.G., and E.T. Craswell. l978. Effect of Nitrogen Source and Management on Ammonia Volatilization Losses from Flooded Rice Soil Systems, Soil Sci. Soc. Am. Proc. 43: 352-358.

7. Vlek, P.L.G., B.H. Byrnes, and E.T. Craswell. l980. Effect of Urea Placement on Leaching Losses of Nitrogen from Flooded Rice Soils. Plant and Soil 54: 441-449.

8. Vlek, P.L.G., C.W. Hong, and L.J. Youngdahl. l979. An Analysis of N Nutrition on Yield and Yield Components for the Improvement of Rice Fertilization in Korea. Agronomy Journal 7l: 829-833.

9. Tejeda, H.R., C.W. Hong, and P.L.G. Vlek. l980. Comparison of Modified Urea Fertilizers and Estimation of their availability Coefficient Using Quadratic Models. Soil Sci. Soc. Am. J. 44: 1256-1262.

10. Vlek, P.L.G., J.M. Stumpe, and B.H. Byrnes. 1980. Urease Activity and Inhibition in Flooded Soil Systems. Fertilizer Research 1: 191-202.

11. Vlek, P.L.G., I.R.P. Fillery, and J.R. Burford. l98l. Accession, Transformation and Loss of Nitrogen in Soils of the Arid Region. Plant and Soil 58: 133-175.

12. Bouwmeester, R.J.B., and P.L.G. Vlek. 198l. Rate Control of Ammonia Volatilization from Rice Paddies. Atmospheric Environment 15: 131-140.

13. Bouwmeester, R.J.B., and P.L.G. Vlek. 1981. Wind-Tunnel Simulation and Assessment of Ammonia Volatilization from Ponded Water. Agronomy Journal 73: 546-552.

14. Moeller, M.B., and P.L.G. Vlek. 1982. The Chemical Dynamics of Ammonia Volatilization from Aqueous Solution. Atmospheric Environment 16: 709-7l8.

15. Fillery, I.R.P., and P.L.G. Vlek. 1982. The Significance of Denitrification of Applied Nitrogen in Fallow and Cropped Rice Soils Under Different Flooding Regimes. Plant and Soil 65: 153-169.

16. Vlek, P.L.G., and E.T. Craswell. 1982. Ammonia Volatilization from Flooded Soils. Fertilizer Research 2: 227-245.

17. Vlek, P.L.G., and M.F. Carter. 1983. The Effect of Soil Environment and Fertilizer Modification on the Kinetics of Hydrolysis of Applied Urea. Soil Science 136: 56-63.

18. Osiname, O., H. van Gijn, and P.L.G. Vlek. 1983. The Effect of Nitrification Inhibitors on the Fate and Efficiency of Nitrogenous Fertilizers under Simulated Humid Tropical Conditions. Tropical Agriculture 60: 211-217.

19. Youngdahl, L.J., R. Pacheco, J.J. Street, and P.L.G. Vlek. 1982. The Kinetics of Ammonium and Nitrate Uptake by Young Rice Plants. Plant and Soil 69: 225-232.

20. El-Zahaby, E.M., S.H. Chien, N.K.Savant, P.L.G. Vlek, and A.U. Mokwunye. 1982. Effect of Pyrophosphate on Phosphate Sorption and Ammonia Volatilization by Calcareous Soils Treated with Ammonium Phosphates. Soil Sci. Soc. Am. J. 46: 733-740.

21. Craswell, E.T. and P.L.G. Vlek. 1983. Fate of Fertilizer Nitrogen in Flooded Systems, In: Gaseous Losses of Nitrogen from Plant Soil Systems. J. Simpson and J.R.Freney, Eds., Martinus Nijhoff Publishers. The Hague, The Netherlands.

22. Stumpe, J.M., P.L.G. Vlek, and W.L. Lindsay. 1984. Ammonia Volatilization from Urea and Urea Phosphates in Calcareous Soils. Soil Sci. Soc. Am. J. 48 (4): 921-927.

23. Bouwmeester, R.J.B., P.L.G. Vlek, and J.M. Stumpe. 1984. Effect of Environmental Factors on NH3 Volatilization from a Urea-Fertilized Soil. Soil Sci. Soc. Am. J. 49 (2): 376-381.

24. Buresh, R.J., P.L.G. Vlek, and J.M. Stumpe. 1984. Labelled Nitrogen Fertilizer Research with urea in the Semi Tropics: I. Greenhouse Studies. Plant and Soil 80: 3-19.

25. Moraghan, J.T., T.J. Rego, R.J. Buresh, P.L.G. Vlek, J.R. Burford, S. Singh and K.L. Sahrawat. 1984. Labelled Nitrogen Fertilizer Research with Urea in the Semi-Arid Tropics: II.Field Studies on a Vertisol. Plant and Soil 80: 21-33.

26. Katyal, J.C., Bijay Singh, P.L.G. Vlek, and E.T. Craswell. 1985. Fate and Efficiency of Nitrogen Fertilizers Applied to Wetland Rice. II. Punjab, India. Fertilizer Research 6 (3): 279-290.

27. Craswell, E.T., S.K. De Datta, C.S. Weeraratne, and P.L.G. Vlek. 1985. Fate and Efficiency of Nitrogen Fertilizers Applied to Wetland Rice. I. The Philippines. Fertilizer Research 6 (1): 49-63.

28. Vlek, P.L.G., and I.R.P. Fillery. 1984. Improving Nitrogen Efficiency in Wetland Rice Soils. The Fertilizer Society Proceedings No. 230.

29. Godwin, D.C., C.A. Jones, J.T. Ritchie, P.L.G. Vlek, and L.J. Youngdahl. 1983. The Water and Nitrogen Components of the CERES Models. In: Minimum Data Sets for Agrotechnology Transfer. IBSNAT/ICRISAT, Hyderabad, India,.

30. Godwin, D.C., and P.L.G. Vlek. 1985. Simulation of Nitrogen Dynamics in Wheat Cropping Systems. In: Wheat Growth and Modeling, Editor, W. Day. NATO Advanced Research Series, pp 311-332.

31. Harmsen, K. and P.L.G. Vlek. 1985. "The Chemistry of Micronutrients in Soil". Fertilizer Research 7: 1-42.

32. Katyal, J.C., and P.L.G. Vlek. 1985. "Micronutrient Problems in Tropical Asia". Fertilizer Research 7: 69-94.

33. Leon, L.A., A.S. Lopez, and P.L.G. Vlek 1985. "Micronutrient Problems in Tropical Latin America". Fertilizer Research 7: 95-130.

34. Sillanpaa, M., and P.L.G. Vlek. 1986. Micronutrients and the Agro-Ecology of Tropical and Mediterranean Regions. Fertilizer Research 7: 131-150.

35. Fillery, I.R.P., and P.L.G. Vlek. 1986. Reappraisal of the Significance of Ammonia Volatilization as an N loss Mechanism in Flooded Rice Fields. In: Nitrogen Economy in Flooded Rice Soils. S.K. DeDatta and W.H. Patrick (Eds.) pp 79-99. Martinus Nijhoff Publishers, Dordrecht, The Netherlands.

36. Vlek, P.L.G., and B.H. Byrnes. 1986. The Efficacy and Loss of Fertilizer N in Lowland Rice. In: Nitrogen Economy in Flooded Rice Soils. S.K. DeDatta and W.H.Patrick, Jr. (Eds) pp 131-148. Martinus Nijhoff Publishers, Dordrecht, The Netherlands.

37. Singh, Bijay; J.C. Katyal, P.K. Malhotra, and P.L.G. Vlek. 1986. Path Coefficient Analysis of N Nutrition on Yield and Yield Components for Rice in a Highly Percolating Soil. Commun. in Soil Sci. Plant Anal. 17: 853-867.

38. Katyal, J.C., Bijay Singh, P.L.G. Vlek, and R.J. Buresh. 1987. Efficient N Use as Affected by Urea Application and Irrigation Sequence. Soil Sci. Soc. Am. J. 51: 366-370.

39. Carter M.F., P.L.G. Vlek, and J.T. Touchton. 1986. Agronomic Evaluation of New Ureaforms for Flooded Rice. Soil Sci. Soc. Am. J. 50: 1055-1060.

40. Katyal, J.C., Bijay Singh, and P.L.G. Vlek. 1988. Effect of Granule Size and the Placement Geometry on the Efficiency of Urea Supergranules for Wetland Rice Grown on a Permeable Soil. Fert. Res. 15: 193-201.

41. Cori, C.E. de, L.S. Holt, and P.L.G. Vlek. 1988. Destino del Nitrógeno Ureico Aplicado a un Tropaquept Arcilloso, bajo Condiciones Similadas de Arroz en Siembra Directa ("Fate of urea nitrogen applied to a clayey Tropaquept, under simulated conditions in direct seeded rice"). Turrialba 38 (4): 294-299.

42. Katyal, J.C., M.F. Carter, and P.L.G. Vlek. 1988. Nitrification Activity in Submerged Soils and Its Relation to Denitrification Loss. Biology and Fertility of Soils 7: 16-22.

43. Stumpe, J.M., P.L.G. Vlek, S.K. Mughogho, and F.Ganry. 1989. Microplot Size Requirements for Measuring Balances of Fertilizer 15N Applied to Maize. Soil Sci. Soc. Am. J. 53: 797-800.

44. Buresh, R.J., P.L.G. Vlek, and K. Harmsen. 1990. "Fate of fertilizer nitrogen applied to wheat under simulated Mediterranean environmental conditions". Fertilizer Research 23: 25-36.

45. Mughogbo, S.K., C.B. Christianson, J.M. Stumpe, and P.L.G. Vlek. 1990. "Nitrogen Efficiency at three sites in Nigeria as affected by N Source and Management". Trop. Agric (Trinidad) Vol.67: 127-132 April.

46. Vlek, P.L.G. 1990. The role of fertilizers in sustaining agriculture in sub-Saharan Africa. Fertilizer Research 26: 327-339.

47. Christianson, C.B., A. Bationo, J. Henao, and P.L.G. Vlek. 1990. Fate and efficiency of N fertilizers applied to pearl millet in Niger. Plant and Soil 125: 221-231.

48. Stumpe, J.M., and P.L.G. Vlek. 1991. Acidification induced by different nitrogen sources in columns of selected tropical soils. Soil Sci. Soc. Am. J. 55: 145-151.

49. Christianson, C.B., and P.L.G. Vlek. 1991. Alleviating soil fertility constraints to food production in West Africa: Efficiency of nitrogen fertilizers applied to food crops. Fertilizer Research 29: 21-33.

50. Hong, C.W., J.C. Katyal and P.L.G. Vlek. 1992. "Losses and Utilization of Nitrogen by Sorghum as Affected by the Depth of a Swelling Clay Soil". J. Agronomy and Crop Science 168: 263-271.

51. Manske G.G.B., A.B. Lüttger, R.K. Behl, and P.L.G. Vlek, 1995. Nutrient Efficiency Based on VA Mycorrhizae (VAM) and Total Root Length of Wheat Cultivars Grown in India. Angew. Bot. 69, 108-110

52. Vlek, P.L.G., M.Y. Diakite, and H. Mueller. 1995. "The Role of Azolla in Curbing Ammonia Volatilization from Flooded Rice Systems". Fertilizer Research 42: 165-174.

53. Vlek, P.L.G. 1993. "Strategies for Sustaining Agriculture in sub-Saharan Africa: The Fertilizer Technology Issue". In: Technologies for Sustainable Agriculture in the Tropics. (Ragland, J. and R. Lal, Eds). ASA Special Publication No 56. pp 265-278. Madison, WI, USA.

54. Vlek, P.L.G. 1995. The soil and its artisans in sub-Saharan African agriculture. Geoderma 67: 165-170.

55. Edi-Premoto M, Moawad AM, Vlek PLG (1996) Effect of phosphate solubilizing Pseudomonas putida on the growth of maize and its survival in the rhizosphere. Ind. JCrop Sci 11: 13 – 23.

56. Vlek, P.L.G., R.F. Kühne, and M. Denich. 1997. Nutrient resources for crop procution in the tropics. Phil. Trans. R. Soc. Lond. B 352: 975-985.

57. Sanetra, C.M., O. Ito, S.M. Virmani, and P.L.G. Vlek. 1998. Remobilization of nitrogen from senescing leaves of pigeonpea (Cajanus cajan (L.) Millsp.): genotypic differences across maturity groups. J. Exp. Bot. 49 (322): 853-862.

58. Wick, B., R.F. Kühne, and P.L.G. Vlek. 1998. Soil microbiological parameters as indicators of soil quality under improved fallow management systems in south-western Nigeria. Plant and Soil 202: 97-107, 1998.

59. Gehring, Chr., M. Denich, M. Kaneshiro and P.L.G. Vlek 1999. Response of secondary vegetation in Eastern Amazonia to relaxed nutrient availability constraints. Biogeochemistry 45:223-241.

60. Kato, M.S.A ., O.R. Kato, M. Denich and P.L.G. Vlek. 1999. Fire-free alternatives to slash-and-burn for shifting cultivation in the eastern Amazon region: the role of fertilizers. Field Crops Research 62:225-237.

61. Egle, K., G. Manske, W. Roemer and P.L.G. Vlek. 1999. Improved phosphorus efficiency of three new wheat genotypes from CIMMYT in comparison with an older Mexican variety. J. Plant Nutr. Soil Sci. 162: 353-358.

62. Mandal, B., P.L.G. Vlek and L.N. Mandal. 1999. Beneficial effects of blue-green algae and Azolla, excluding supplying nitrogen, on wetland rice fields: a review. Biology & Fert. of Soils 28: 329-342.

63. Denich, M., M. Kanashiro and Paul L.G. Vlek. 2000. The potential and dynamics of carbon sequestration in traditional and modified fallow systems of the eastern Amazon region, Brazil. In: Global climate change and tropical ecosystems. R. Lal, H. Eswaran, J.M. Kimble and B. A. Stewart (Eds.) Lewis Publishers CRC press, Boca Raton, Fl. USA.

64. Bationo, A., Wani, S.P., Bielders, C.L., Vlek, P.L.G. and Mokwunye, A.U. 2000. Crop Residue and Fertilizer Management to Improve Soil Organic Carbon Content, Soil Quality and Productivity in the Desert. In: Global climate change and tropical ecosystems. R. Lal, H. Eswaran, J.M. Kimble and B. A. Stewart (Eds.) Lewis Publishers CRC press, Boca Raton, Fl.USA.

65. Sommer, R., M. Denich and P.L.G. Vlek 2000. Carbon storage and root penetration in deep soils under small-farmer land-use systems in the Eastern Amazon region, Brazil. Plant Soil 219: 231-241

66. Lange-Ness, Ricardo and Paul L.G. Vlek. 2000. Mechanism of calcium and phosphate release from Hydroxy-Apatite by mycorrhizal hyphae. Soil Sci. Soc. Amer. J. 64: 949-955

67. Gorfu, Amanuel, R.F. Kuehne, D.G. Tanner and P.L.G. Vlek. 2000. Biological nitrogen fixation in Faba bean (Vicia faba L.) in the Ethiopian highlands as affected by P fertilization and inoculation. Biol. Fert. Soil 32:1-7.

68. Manske, G.G.B., J.I. Ortiz-Monasterio, M. van Ginkel, R.M. González, S. Rajaram, E. Molina and P.L.G. Vlek. 2000. Traits associated with improved P-uptake efficiency in CYMMIT’s semidwarf spring bread wheat grown on an acid Andisol in Mexico. Plant Soil 221(2): 189-204.

69. Brienza Junior, S. M. Denich and P.L.G. Vlek 2001. Enriquecimiento de barbechos con leguminosas arbóreas como alternativa para la tumba y quema en la Amazonía Oriental Brasileña. Fallow enrichment with leguminous trees as an alternative to slash and burn in the Eastern Brazilian Amazon. Agroforestería en las Amérricas (CATIE) 8 (32) 16-19.

70. Chesney, PE; Schlönvoigt, A; Kass, D; Vlek, P; Murach, D. 2001. Respuestas de las raíces finas y la acumulación de nitrógeno en el follaje de Erythrina poeppigiana después depodas parciales o completas. Agroforestería en las Américas 8(30):48-57

71. Manske. G.G.B., J.I. Ortiz-Monasterio, M. van Ginkel, R:M. González, R.A. Fischer, S. Rajaram and P.L.G. Vlek. 2001. Importance of P uptake efficiency versus P utilization for wheat in acid and calcareous soils in Mexico. European J. Agron. 14: 261 – 274.

72. Martius. C., H. Tiessen, and P.L.G. Vlek. 2001. The management of organic matter in tropical soils: what are the priorities? Nutrient Cycl. In Agroecosystems. 61: 1 – 6

73. Gole., T:W., M. Denich, D. Teketay and P.L.G. Vlek. 2002. Human impact on the Coffea arabica genepool in Ethiopia and the need for its in situ conservation. In. (Eds. Engels, Rao, Brown and Jackson). Managing plant genetic diversity. CAB International Ch 23: 237- 247.

74. Van de Giesen, N., Marc Andreini, Anette van Edig and Paul Vlek. 2001. Competition for water resources of the Volta basin. Regional Water Managm. of Water Res. IAHS Publ no 268.

75. Andreini, Mark., Paul Vlek and Nick van de Giesen. 2002. Water sharing in the Volta basin. In: FRIEND 2002 – Regional Hydrology: Bridging the gap between research and practice. IAHS Publ. No 274.

76. Wick, Barbera, Ronald Kuehne, Konrad Vielhauer and Paul L. G. Vlek. 2002. Temporal variability of selected soil microbiological and biochemical indicators under different soil quality conditions in south-western Nigeria. Biology and Fertility of Soils 35, 155-167.

77. Manske, Guenther.G.B. and Paul.L.G. Vlek. 2002. Root architecture – Wheat as a model plant. In: Plant roots, the hidden half. (Eds. Y Waisel, A. Eshel, and U. Kafkafi). Marcel Dekker, Inc. New York-Basel.

78. Giesen, N. van de, H. Kunstmann, G. Jung, J. Liebe, M. Andreini and P.L.G. Vlek, 2002. The GLOWA-Volta project: Integrated assessment of feedback mechanisms between climate, landuse, and hydrology. Advances in Global Change Research, Vol 10: 151-170

79. Park, S.J. and P.L.G. Vlek. 2002. Soil-landscape analysis as a tool for sustainable land management. Geogr. J. Korea. 36: 31-49.

80. Park, S.J. and P.L.G. Vlek. 2002. Environmental correlation of three-dimensional soil spatial variability: a comparison of three adaptive techniques. Geoderma, Vol. 109 (1-2): 117-140.

81. Manske, GGB, Ortiz-Monasterio, JI, van Ginkel, RM, Rajaram, S and Vlek, PLG, 2002. Phosphorus use efficiency in tall, semi-dwarf and dwarf near-isogenic lines of pring wheat. Euphytica 125 (1), pp. 113-119

82. Sommer, R., T.D. de Abreu Sá, K. Vielhauer, A. Carioca de Araújo, H.Foelster, and P.L.G. Vlek. 2002. Transpiration and canopy conductance of secondary vegetation in the Eastern Amazon. Agricult. and Forest Meteorology 112: 103-121

83. Gorfu, A., R.F. Kuehne, D.G. Tanner and P.L.G. Vlek. 2003. Recovery of 15N-labelled urea applied to wheat (Triticum aestivum L.) in the Ethiopian highlands as affected by P fertilization. J. Agronomy & Crop Science 189, 30 – 38.

84. Cissé, M and P.L.G. Vlek. 2003. Conservation of urea-N by immobilization-remobilization in a rice-Azolla intercrop. Plant Soil 250: 95 -104.

85. Cissé, M and P.L.G. Vlek. 2003. Influence of urea on biological N2 fixation and N transfer from Azolla intercropped with rice. Plant Soil 250: 105 – 112.

86. Somado, E. A., M. Becker, R. Kühne, K. L. Sahrawat, P.L.G. Vlek (2003) Combined effects of legumes with phosphate rock on rice in West Africa. Agron. J. 95:1172-1178.

87. Sommer, R., H. Fölster, K. Vielhauer, E.J. Maklouf Carvalho and P.L.G. Vlek. 2003. Deep soil water dynamics and depletion by secondary vegetation in the Eastern Amazon. SSSAJ. 67(6): 1672-1686.

88. Fosu, M., R.F. Kühne and P.L.G. Vlek. 2003. Recovery of cover-crop-N in the soil-plant

system in the Guinea savannah zone of Ghana. Biol Fertil Soils 39: 117 – 122.

89. Brienza Junior, S. M. Denich and P.L.G. Vlek 2001. Enriquecimiento de barbechos con leguminosas arbóreas como alternativa para la tumba y quema en la Amazonía Oriental Brasileña. Fallow enrichment with leguminous trees as an alternative to slash and burn in the Eastern Brazilian Amazon. Agroforestería en las Amérricas (CATIE) 8 (32) 16-19.

90. Wassmann R, and P.L.G. Vlek. 2004. Mitigating greenhouse gas emissions from tropical agriculture: Scope and Research Priorities. Environment, Development and Sustainability 6(1-2): 1-9.

91. Vlek, P.L.G., G. Rodríguez-Kuhl and R. Sommer. 2004. Energy use and CO2 production in tropical agriculture and means and strategies for reduction or mitigation. Environment, Development and Sustainability 6(1-2):213-233.

92. Braimoh, A.K. and P.L.G. Vlek. 2004. Land-cover dynamics in an urban area of Ghana.

Earth Interactions 8 (1): 1- 15

93. Braimoh, A.K. and P.L.G. Vlek. 2004. The impact of land-cover change on soil properties in Northern Ghana. Land Degrad. and Develop. 15: 65-74.

94. Braimoh, A.K. and P.L.G. Vlek. 2004. Scale dependent relationships between land-use change and its determinants in the Volta Basin of Ghana. Earth Interactions: 8 (4): 1-23.

95. Braimoh, A.K., P.L.G. Vlek and A. Stein. 2004. Land evaluation for maize based on fuzzy set and interpolation. Environm- Managem. 33: 226-238.

96. Denich, M., K. Vielhauer, M.S. de A. Kato, A. Block, O.R. Kato, T.D. de Abreu SÃ, W. Lücke, P.L.G. Vlek. 2004. Mechanized land preparation in forest-based fallow systems: The experience from Eastern Amazonia. Agroforestry Systems 61: 91-106

97. Kurzatkowski, D., Chr. Martius, H. Hüfer, M. Garcia, B. Fölster, L. Beck, P. Vlek. 2004. Litter decomposition, microbial biomass and activity of soil organisms in three agroforestry sites in central Amazonia. Nutr. Cycling Agroecosyst. 69: 257-268

98. Macale de, M.A.R. and P.L.G. Vlek. 2004 The role of Azolla cover in improving the nitrogen use efficiency of lowland rice. Pland Soil 263:307-317

99. Brunner, A.C., S. J. Park, G.R. Ruecker, R. Dikau and P.L.G. Vlek. 2004. Catenary soil development influencing erosion susceptability along a hilslope in Uganda. CATENA 58: 1-22.

100. Sommer, R., P.L.G. Vlek, T. D. A de Sá, K. Vielhauer, R. De Fátima Rodrigues Coelho

and H.Foelster. 2004 Nutrient balance of shifting cultivation by burning or mulching in the Eastern Amazon – evidence for subsoil nutrient accumulation. Nutr. Cycling in Agroecosystems. 68: 257 – 271.

101. Fosu, M., R.F. Kühne and P.L.G. Vlek. 2004. Improving maize yield in the Guinea Savannah zone of Ghana with leguminous cover crops and PK fertilization. Journal of Agronomy 3(2): 115-121.

102. Kaizzi, C.K., H. Ssali and P.L.G. Vlek. 2004. The potential of Velvet bean (Mucuna pruriens) and N fertilizers in maize production on contrasting soils and agro-ecological zones of East Uganda. Nutr. Cycling in Agroecosyst. 68: 59-72.

103. Gehring, Chr. And P.L.G. Vlek. 2004. Limitations of the 15N natural abundance method for estimating biological nitrogen fixation in Amazonian forest legumes. Basic and Applied Ecology 5: 567 – 580.

104. Braimoh, A.K. and P.L.G. Vlek. 2004. Land-cover change analyses in the Volta Basin of Ghana. Earth Interactions 8. Paper 21.

105. Oguntunde, P.G., N.C. van de Giesen, P.L.G. Vlek and H. Eggers. 2004. Water flux in a Cashew orchard during a wet-to dry transition period: Analysis of sap flow and eddy correlation measurements. Earth Interactions 8 (15): 1-17.

106. Braimoh, A.K., Stein, A. and Vlek, P.L.G. (2005). Identification and Mapping of Associations among Soil Variables. Soil Science. 170(2):137-148.

107. Mitra, S. R, Wassmann and P.L.G. Vlek. 2005. An appraisal of global wetland and its

organic carbon stock. Current Science: 88 (1): 25-35. 108. Le Phuong, T., M. Denich, P. L. G. Vlek, V. Balasubramanian 2005. Suppressing

weeds in direct-seeded lowland rice: effects of methods and rates of seeding. Journal of Agronomy and Crop Science 191(3), 185-194.

109. Codjoe, S.N.A., E. Ehlers and P.L.G. Vlek. 2005. Effects of change in population,

household conditions and farming practices on agricultural land use in the Volta river basin of Ghana. Erdkunde 59: 126-135.

110. Denich, Manfred, Paul L.G. Vlek, Tatiana D. de Abreu Sá, Konrad Vielhauer and

Wolfgang Lücke. 2005. A concept for the development of fire-free fallow management in the Eastern Amazon, Brazil, Agriculture, Ecosystems & Environment 110, (1-2) , 43-58

111. Denich, Manfred and Paul L. G. Vlek. 2005. Resilience of secondary forest regrowth

after slash-and-burn agriculture in central Amazonia. Journal of Tropical Ecology 21(05):519 – 527.DOI: 10.1017/S0266467405002543

112. Hillel, D. and P. Vlek. 2005. The sustainability of irrigation. Advances in Agronomy 87.

113. Youkhana, E., B. Arendt, H. Kunstmann, N. Martin, C. Rodgers, and P.L.G. Vlek.

2005. The GLOWA-Volta project: Studies on the sustainable use of water resources in the Volta river basin in West Africa. Hydrol. u. Wasserbewirtsch. (HW) 49 (4): 190-200.

114. Braimoh, A.K., and Vlek, P.L.G. (2005). Land cover change trajectories in Northern Ghana Environmental Management 36 (3): 356-373.

115. Park, S.J., N. van de Giesen and P.L.G. Vlek. 2005. Optimal spatial scale for land use

change modelling: A case study in a savanna landscape in Northern Ghana. J. Korean Geogr. Soc. 40: 221-241.

116. Park, S.J., Hwang, C.S., Vlek, P.L.G. 2005. Comparison of adaptive techniques to

predict crop yield response under varying soil and land management conditions, Agricultural Systems. 85(1). 59 – 81.

117. Senbeta, F. Chr. Schmitt, M. Denich, S. Demissew. P.L.G. Vlek, H. Preisinger. T.

Woldemariam and D. Teketay. 2005. The diversity and distribution of lianasa in the Afronmontane rain forest of Ethiopia. Diversity Distrib. 11: 443 – 452.

118. Hendrickx, J.M.H., J.B.J. Harrison, R.L.v. Dam, B. Borchers, D.I. Norman, C.D. Dedzoe, B.O. Antwi, R.D. Asiamah, C. Rodgers, P. Vlek, and J. Friesen. 2005. Magnetic soil properties in Ghana. Proc. International Society for Optical Engineering, SPIE 5794:165-176.

119. Grote, U. E.T. Craswell and P.L.G. Vlek. 2005 Nutrient flows in international trade:

Ecology and policy issues. Environmental Science & Policy Vol. 8, (5): 439-451.

120. Gehring, C., P.L.G. Vlek, L.A.G. de Souza and M. Denich. 2005. Biological nitrogen fixation in secondary regrowth and primary forests of Central Amazonia. Agric. Ecosyst. and Environm. 111: 237 – 252.

121. Gehring, C., M Denich and P.L.G. Vlek. 2005. Resilience of secondary forest regrowth after Slash-and-Burn Agriculture in Central Amazonia. J. Trop. Ecology. 21: 1-9.

122. Khamzina, A., J.P.A. Lamers, M. Worbes, E. Botman and P.L.G. Vlek. 2006.

Assessing the potential of trees for afforestation of degraded landscapes in the Aral Sea Basin of Uzbekistan. Agroforestry Systems. 66 (2): 129-141.

123. Kaizzi, C.K., H. Ssali and P.L.G. Vlek. 2006. Differential use and benefits of Velvet bean (Mucuna pruriens var. utilis) and N fertilizers in maize production in contrasting agro-ecological zones of E. Uganda. Agric. Systems: 88: 44-60.

124. Tamene, L., S.J. Park, R. Dikau and P.L.G. Vlek. 2006. Analysis of factors determining sediment yield variability in the highlands of northern Ethiopia. Geomorphology 76: 76-91.

125. Khamzina, A., J.P.A. Lamers, Chr. Martius, M. Worbes and P.L.G. Vlek. 2006. Potential of nine multipurpose tree species to reduce saline groundwater tables in the lower Amu Darya river region of Uzbekistan. Agroforestry Syst. 68: 151-165.

126. Hendrickx, J.M.H., S.-h. Hong, J. Friesen, H. Compaore, N.C. van de Giesen, C. Rodgers, and P.L.G. Vlek. 2006. Mapping energy balance fluxes and root zone soil moisture in the White Volta Basin using optical imagery. Proc. International Society for Optical Engineering, SPIE 6239:238-249.

127. F Mussgnug, M Becker, TT Son, RJ Buresh, PLG Vlek. 2006 Yield gaps and nutrient balances in intensive, rice-based cropping systems on degraded soils in the Red River Delta of Vietnam. Field Crops Research 98 (2), 127-140.

128. Tamene, L. S.J. Park, R. Dikau, and P.L.G. Vlek. 2006. Reservoir siltation in the semi-arid highlands of northern Ethiopia: sediment yield – catchment area relationship and a semi-quantitive approach for predicting sediment yield. Earth Surf. Process. Landforms: 31: 1364 – 1383.

129. Chhabra, A., H. Geist, R.A. Houghton, H. Haberl, A.K. Braimoh, P.L.G. Vlek, J. Patz, J. Xu, N. Ramankutty, O. Coomes and E. F. Lambin. 2006. Multiple impacts of land-use/cover change. In: Land-Use and Land-Cover Change. Local Processes and Global Impacts, Chapter 4: 71- 116. E.F. Lambim and H. Geist (Eds.). Springer-Verlag, Berlin Heidelberg, Germany.

130. Fatondji, D., C. Martius, C.L. Bielders, P.L.G. Vlek, A. Bationo, B. Gerard. 2006. Effect of planting technique and amendment type on pearl millet yield, nutrient uptake, and water use on degraded land in Niger. Nutr. Cycling Agroecosyst. 76: 203-217.

131. Rodgers, C., N.van de Giesen, W. Laube, P.L.G.Vlek and E.Youkhana. 2007. The GLOWA Volta Project: A framework for water resources decision-making and scientific capacity building in a transnational West African Basin. Water Resources Management. 21: 295-313.

132. Tamene, L., and P.L.G. Vlek. 2007. Assessing the potential of changing land use for reducing soil erosion and sediment yield of catchments: a case study in the highlands of northern Ethiopia. Soil Use and Management. 23: 82-91.

133. Fosu, M., R.F. Kuehne and P.L.G. Vlek. 2007. Mineralization and microbial biomass dynamics during decomposition of four leguminous residues. J. Biol. Sci. 7(4): 632-637

134. Hafeez MM, Bouman BAM, Van De Giesen N., Mushtaq S., Vlek P. and Khan S. 2007. Water re-use and cost-benefit of pumping at different spatial levels in a rice irrigation system in UPRIIS, Philippines. Journal of Physics and Chemistry of the Earth. 33: 115–126.

135. Hafeez MM, Bouman BAS, Van De Giesen N, and Vlek P. 2007. Scale effects on water use and water productivity in a rice-based irrigation system (UPRIIS) in the Philippines. Journal of Agricultural Water Management 92: 81-89.

136. Bharati, L., C. Rodgers, S. Shumilov, M. Plotnikova and P. Vlek. 2007. Integrated modelling of conjunctiv use of surface and groundwater resources in a small scale irrigation system in the Volta Basin, Africa. IAHS Publ. 317.

137. Van de Giesen, N., C. Rodgers and P.L.G. Vlek. 2007. The GLOWA Volta Project: Interdisciplinary analysis oft he impact of global change on a river basin in West Africa. Int. J. of River Basin Management. 5: 3-8.

138. Agyare, W.A., S.J. Park and P.L.G. Vlek. 2007. Artificial neural network estimation of saturated hydraulic conductivity. www.vadosezonejournal.org Vol 6: 423-431.

139. Zhou Shi, G. R. Ruecker, M. Mueller, Chr. Conrad, N. Ibragimov, J. P. A. Lamers, Chr. Martius, G. Strunz, S. Dech and P. L. G. Vlek. 2007 Modeling of Cotton Yields in the Amu Darya River Floodplains of Uzbekistan Integrating Multitemporal Remote Sensing and Minimum Field Data. Agron. J. 99:1317-1326.

140. Van De Giesen, N., Kunstmann, H., Jung, G., Liebe, J., Andreini , M., Vlek, P.L.G. 2008. The GLOWA Volta project: Integrated assessment of feedback mechanisms between climate, landuse, and hydrology. IN: Climatic Change: Implications for the Hydrological Cycle and for Water Management Volume 10 of the series Advances in Global Change Research pp 151-170

141. Bharati L., Rodgers C., Shumilov, S., Plotnikova, M., Vlek, P and Martin, N. 2008. Integration of Economic and Hydrologic Models - An Application to Evaluate Conjunctive Irrigation Water Use Strategies in the Volta Basin. Agricultural Water Management 95: 925-936

142. Khamzina, A. J.P.A. Lamers and P.L.G. Vlek. 2008. Tree establishment under deficit irrigation on degraded agricultural land in the lower Amu Darya river region, Aral Sea basin. Forest Ecology and Management, 255: 168-178.

143. Compaoré, Halidou , Jan M.H. Hendrickx, Sung-ho Hong, Jan Friesen, Nick C. van de Giesen, Charles Rodgers, Joerg Szarzynski, Paul L.G. Vlek. 2008 Evaporation mapping at two scales using optical imagery in the White Volta Basin, Upper East Ghana. Physics and Chemistry of the Earth 33: 127–140.

144. Le Quang Bao, Soo Jin Park, Paul L.G. Vlek, Armin B. Cremers. 2008. Land-Use Dynamic Simulator (LUDAS): A multi-agent system model for simulating spatio-temporal dynamics of coupled human–landscape system. I. Structure and theoretical specification. Ecological Informatics 3: 135 – 153.

145. Vlek, P.L.G. 2008. The incipient threat of land degradation. J. Indian Soc. Soil Sci. 56:1-13.

146. Cattanio, J.H., R. Kuehne and P.L.G. Vlek. 2008. Organic material decomposition and nutrient dynamics in a mulch system enriched with leguminous trees in the Amazon. R. Bras. Ci. Solo, 32:1073-1086.

147. Ruecker, G., Brunner, A., Park, S., Vlek, P. 2008. Assessment of soil redistribution on two contrasting hillslopes in Uganda using Caesium-137 modelling. Erdkunde - Archive for scientific geography. Vol. 62, Number 3, 259-272.

148. Mdemu, M.V., C.Rodgers, P.L.G. Vlek and J.J. Bogardi. 2008. Water productivity (WP) in reservoir irrigated schemes in the upper east region (UER) of Ghana. Physics and Chemistry of the Earth, 34: 324-328. http://dx.doi.org/10.1016/j.pce.2008.08.006

149. Brunner A. C., S. J. Park G. R. Ruecker and P. L. G. Vlek. 2008. Erosion modelling approach to simulate the effect of land management options on soil loss by considering catenary soil development and farmers perception. Land Degrad. Develop 19: 623 – 635.

150. Barthlott, W., J. Szarzynski, P. Vlek, W. Lobin and N. Korotkova 2008. A torch in the rainforest: termogenesis oft he Titan arum (Amorphophallus titanum). Plant Biology ISSN 1435-8603 http://www3.interscience.wiley.com/journal/119882628/issue

151. Sommer R., K. Kienzler, C. Conrad, N. Ibragimov, J Lamers, Chr. Martius, P. Vlek.

2008. Evaluation of the CropSyst model for simulating the potential yield of cotton. Agron. Sustain. Dev. 28, 345-354. DOI: 10.1051/agro:2008008

152. Akramkhanov, A., Sommer, R., Martius, C. Hendrickx, J. M. H. and P.L.G.Vlek 2008. Comparison and sensitivity of measurement techniques for spatial distribution of soil salinity. Irrigation and Drainage Systems 22,115-126..DOI 10.1007/s10795-008-9043-9

153. Ajaye, A.E., N. van de Giesen, P.L.G. Vlek. 2008. A numerical method for simulating Hortonian overland flow on tropical hillslopes with vegetation elements. Hydrological Processes, 22:1107-1118.

154. Forkutsa, I., Rolf Sommer, Y. I. Shirokova, J. P. A. Lamers, K. Kienzler, B. Tischbein, C. Martius, P. L. G. Vlek. 2009. Modeling irrigated cotton with shallow groundwater in the Aral Sea Basin of Uzbekistan: I. Water dynamics Irrig Sci. 27 (4), 331-346.

155. Forkutsa, I., Rolf Sommer, Y. I. Shirokova, J. P. A. Lamers, K. Kienzler, B. Tischbein, C. Martius, P. L. G. Vlek. 2009. Modeling irrigated cotton with shallow groundwater in the Aral Sea Basin of Uzbekistan: II. Soil salinity dynamics Irrig Sci 27 (4), 319-330.

156. MacCarthy, D.S., R. Sommer, P. L. G. Vlek. 2009. Modeling the impacts of contrasting nutrient and residue management practices on grain yield of sorghum (Sorghum bicolor (L.) Moench) in a semi-arid region of Ghana using APSIM. Field Crops Res.105-115.

157. Park, S. J., G. R. Rüecker, W. A. Agyare, A. Akramhanov, D. Kim, P. L. G. Vlek 2009. Influence of Grid Cell Size and Flow Routing Algorithm on Soil-Landform Modeling Journal of the Korean Geographical Society Vol 44 (2) : 122 – 145.

158. Vlek, P.L.G., Le, Q.B., Tamene, L.D., 2009. African land degradation in a world of

global change: does atmospheric fertilization conceal degradation? , MARCO Symposium/Workshop 2009: Challenges for Agro-Environmental Research in Monsoon

Asia, October 5-7 2009, Tsukuba, Japan, pp. 1 - 8. 159. Khamzina, A, R. Sommer, J.P.A. Lamers, P.L.G. Vlek. 2009. Transpiration and early

growth of tree plantations established on degraded cropland over shallow saline groundwater table in northwest Uzbekistan Agricultural and Forest Meteorology http://dx.doi.org/10.1016/j.agrformet.2009.06.015

160. Khamzina, A., J.P.A. Lamers and P.L.G. Vlek. 2009. Nitrogen fixation by Eleagnus angustifolia L. in the reclamation of degraded croplands of Central Asia. Tree Physiology:29: 799-808.

161. Djumaeva, D., Djanibekov, N., Vlek, P.L.G., Martius, C., Lamers, J.P.A. 2009. Options for optimizing dairy feed rations with foliage of trees grown in the irrigated drylands of Central Asia. Research Journal of Agricultural and Biological Sciences, 5(5). pages 698-708

162. Fatondji, D. C. Martius, C.L. Bielders, S. Koala, P.L.G. Vlek, R. Zougmore (2009): Decomposition of organic amendment and nutrient release under the zai technique in the Sahel. Nutrient Cycling in Agroecosystems, 85(3), 225-239. DOI 10.1007/s10705-009-9261-z

163. Adwubi, A., B. K. Amegashie, W. A. Agyare, L. Tamene, S. Nii Odai, C. Quansah and P. Vlek. 2009. Assessing sediment inputs to small reservoirs in Upper East Region, Ghana. Lakes & Reservoirs: Research and Management 14: 279–287

164. Le Q. B., S. J. Park, P. L.G. Vlek. 2010. Land Use Dynamic Simulator (LUDAS): a multi-agent system model for simulating spatio-temporal dynamics of coupled human–landscape system. 2-. Scenario-based application for impact assessment of land-use policies. Ecological Informatics 5(3): 203-221. http://dx.doi.org/10.1016/j.ecoinf.2010.02.001)

165. Djumaniyazova Yulduz, Rolf Sommer, Nazar Ibragimov, Jumanazar Ruzimov, John Lamers, Paul Vlek. 2010 Simulating water use and N response of winter wheat in the irrigated floodplains of Northwest Uzbekistan. Field Crops Research 116: 239–251

166. Djumaeva, D., Lamers, J.P.A., Martius, C., Khamzina, A., Vlek, P.L.G. 2010. Quantification of symbiotic nitrogen fixation by Elaeagnus angustifolia L. on salt-affected irrigated croplands using two 15N isotopic methods. Nutr. Cycl. Agroecosyst., 88:329- online first: DOI 10.1007/s10705-010-9357-5.

167. MacCarthy, D.S., Paul L.G. Vlek, A. Batiano, R. Tabo and M. Fosu. 2010, Modeling nutrient and water productivity of sorghum in smallholder farming systems in a semi-arid region of Ghana. Field Crops Res. 118: 251-258 doi:10.1016/j.fcr.2010.06.005

168. Feitosa, F.F., Q. B Le, and P. L.G. Vlek. 2010.Multi-agent simulator for urban segregation (MASUS): A tool to explore alternatives for promoting inclusive cities Computers, Environment and Urban Systems. http://dx.doi.org/10.1016/j.compenvurbsys.2010.06.001

169. Villamor, G.B. M. van Noordwijk, Q.B. Le, B. Lusiana, R. Matthews and P.L.G. Vlek. 2011. Diversity deficits in modeled landscape Ecological Informatics. 6 (1):. 73 - 82. Doi: 10. 1016/j.ecoinf.2010.08.003

170. Vlek. P.L.G., Q.B. Le and L. Tamene. 2010. Assessment of land degradation, its possible causes and threat to food security in Sub.Saharan Africa. IN: R.Lal and B.A. Stewart (eds)

Advances in Soil Science – Food Securita and Soil Quality. CRC Press, Boca Raton: 57-86

171. Mondal, Md. A. H., M. Denich, P. L.G. Vlek. 2010. The future choice of technologies and co-benefits of CO2 emission reductionin Bangladesh power sector. Energy 35: 4902-4909.

172. Kihara, J., A. Bationo, D. N. Mugendi, C. Martius and P. L. G. Vlek. 2010. Fertilizer combinations affect maize productivity, soil structure and nutrient balances in semi-arid Kenya. Nutr Cycl Agroecosyst. DOI 10.1007/s10705-011-9423-7

173. Nyarko, B.K. D.K. Essumang, M.J. Eghan, B. Reichert, N. van de Giesen and P.L.G. Vlek. 2010. Use of isotopes to study floodplain and wetland and river flow interaction in th White River Volta Basin, Ghana. Isotopes in Environmental Health Studies 46: 91- 106.

174. Tesfahunegn, G. B., L. Tamene and P. L.G. Vlek. 2011. A participatory soil quality assessment in Northern Ethiopia's Mai-Negus catchment. Catena: 86: 1-13. doi:10.1016/j.catena.2011.01.013

175. Tesfahunegn, G.B., L. Tamene and P. L.G. Vlek. 2011. Evaluation of soil quality identified by local farmers in Mai-Negus catchment, northern Ethiopia. Geoderma: Volume 163,(3-4): 209-218.http://dx.doi.org/10.1016/j.geoderma.2011.04.016

176. Amegashi, B. K., C. Quansah, W. A. Agyare, L. Tamene, P. L. G. Vlek. 2011. Sediment-bound nutrient export from five small reservoir catchments and its implications for the Sudan savanna zone of Ghana. Lakes & Reservoirs: Research & Management: 16:61-76

177. Tischbein, B., A.M. Manschadi, A-K. Hornidge, Chr. Conrad, J.P.A. Lamers, L. Oberkircher, G. Schorcht and P.L. G. Vlek. 2011. Anseatze fuer ein effiziente Wassernutzung in der Provinz Khoresm, Usbekistan. (Proposals for a more efficient utilization of water resources in the Province of Khoresm, Uzbekistan). Hydro und Wasserwirtschaft (HW) 55 (2): 116 – 125. Conservation tillage, local organic resources and nitrogen

178. Oguntunde, Ph. G., A. E. Ajayi, J. Friesen, N. van de Giesen and P. L. G. Vlek. 2011. Seasonal Variation of Temporal Patterns of Water Flux in a Cashew Orchard under Sub-humid Tropical Conditions. Journal of Crop Improvement, 25:504–520.

179. Conrad Chr., R. R. Colditz, S. Dech, D. Klein, P. G. L. Vlek. 2011. Temporal segmentation of MODIS time series for improving crop classification in Central Asian irrigation systems. International Journal Of Remote Sensing (DOI:10.1.2010.550647)

180. Mekuria, A., P.L.G. Vlek and M. Denich. 2011. Application of the Caesium-137 technique to soil degradation studies in the southwestern highlands of Ethiopia. Land Degrad. Develop. DOI: 10.1002/ldr.1088.

181. Tesfahunegn, G.B., L. Tamene and P. L.G. Vlek. 2011. Catchment-scale spatial variability of soil properties and implications on site-specific soil management in northern Ethiopia. Soil & Tillage Research. doi:10.1016/j.still.2011.09.005

182. Tamene Lulseged, Assefa Abegaz, Ermias Aynekulu, Kifle Woldearegay and Paul L. G. Vlek 2011. Estimating sediment yield risk of reservoirs in northern Ethiopia using expert knowledge and semi-quantitative approaches Lakes & Reservoirs: Research and Management 16: 293–305.

183. Tesfahunegn Gebreyesus Brhane, Lulseged Tamene, Paul L. G. Vlek 2011. A participatory soil quality assessment in Northern Ethiopia's Mai-Negus catchment. Fuel and

Energy Abstracts 86(1):1-13.

184. Kihara, Job, Christopher Martius, Andre Bationo and Paul L. G. Vlek 2011. Effects of tillage and crop residue application on soybean nitrogen fixation in a tropical ferralsol. Agriculture 2011, 1(1), 22-37; doi:10.3390/agriculture1010022

185. Brienza Jr S., r. Parente de Oliveira, M. Denich and P.L.G. Vlek. 2011. Plantio de árvores de crescimento rápido para recuperação de áreas agrícolas na Amazônia Oriental brasileira: estudo de caso com produção de milho e mandioca Planting of fast-growing trees for recovery of agricultural areas in the Eastern of Brazilian Amazon: studying case of maize and cassava prodution

186. Akramkhanov, A., and P. L. G. Vlek. 2012. The assessment of spatial distribution of soil salinity risk using neural network. Environmental Monitoring and Assessment, 184(4): 2475-2485.

187. Khamzina A., J.P.A. Lamers and P.L.G. Vlek. 2012. Conversion of degraded cropland to tree plantationsfor ecosystem and livelihood benefits. In: Martius C., Rudenko I., Lamers J.P.A., Vlek P.L.G. (eds.), Cotton, Water, Salts and Soums - Economic and Ecological Restructuring in Khorezm, Uzbekistan. Springer Science 2012, pp 235-248.

188. Tesfahunegn, G.B., P. L.G. Vlek and L. Tamene 2012. Management strategies for reducing soil degradation through modeling in a GIS environment in northern Ethiopia catchment. Nutreint Cycling in Agroecosystems: 92, (3): 255-272 (DOI 10.1007/s10705-012-9488-y6JAE10-156R1)

189. Djumaeva D., J.P.A. Lamers, C. Martius and P.L.G. Vlek 2012. Chlorophyll meters for monitoring foliar nitrogen in three tree species from arid Central Asia. Journal of Arid Environments 85: 41-45. doi:10.1016/j.jaridenv.2012.03.008. ISSN 0140-1963 Elsevier B.V. London Academic Press.

190. Kihara, J., C. Martius, A. Bationo, M. Thuita, D. Lesueur, L. Herrmann, W. Amelung, P.L.G. Vlek. 2012 Soil aggregation and total diversity of bacteria and fungi in various tillage systems of sub-humid and semi-arid Kenya. Applied Soil Ecology 58:12-20

191. Le, Quang Bao, Tamene, Lulseged, Vlek, Paul L.G.,2012 Multipronged assessment of land degradation in West Africa to assess the importance of atmospheric fertilization in masking the processes involved. Global and Planetary Change 92–93: 71–81 (doi: 10.1016/ j.gloplacha.2012.05.003)

192. Vu Manh Quyet, Quang Bao L, Roland W. Scholz, Paul L.G. Vlek. 2012. Detecting geographic hotspots of human-induced land degradation in Vietnam and characterization of their social-ecological types. Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International, pp. 6220-6223. DOI: 10.1109/IGARSS.2012.6352679

193. Fosu-Mensah B. Y., P. L. G. Vlek and D. S. MacCarthy. 2012 Farmers’ perception and adaptation to climate change: a case study of Sekyedumase district in Ghana. Environment, Development and Sustainability: 14 (4), 495-505

194. Kugbe, Joseph X., Fosu Mathias, Tamene Desta, Manfred Denich & Paul L. G. Vlek 2012.Annual vegetation burns across the northern savanna region of Ghana: period of occurrence, area burns, nutrient losses and emissions Nutr Cycl Agroecosyst. 93:265–284. DOI 10.1007/s10705-012-9514-0

195. McCarty, D.S. and P.L.G. Vek. 2012. Impact of climate change on sorghum production under different nutrient and crop residue management in semi-arid region of Ghana: A modeling perspective. African Crop Science Journal 20 (2), 243-259

196. Feitosa, F. F., Q. B. Le, P. L. G. Vlek, A. M. V Monteiro and R. Rosemback. 2012. Countering urban segregation in Brazilian cities: policy-oriented explorations using agent-based simulation. Environmental and Planning B, 39(6), 1131-1150.

197. Fosu-Mensah, B. Y., D. S. MacCarthy, P. L. G. Vlek & E. Y. Safo. 2012. Simulating impact of seasonal climatic variation on the response of maize (Zea mays L.) to inorganic fertilizer in sub-humid Ghana. Nutrient Cycling in Agroecosystems. (DOI) 10.1007/s10705-012-9539-4

198. Damene S., L. Tamene and P.L.G. Vlek 2013. Performance of exclosure in restoring soil fertility: A case of Gubalafto district in North Wello Zone, northern highlands of Ethiopia. CATENA,101: 136-142.

199. Tesfahunegna Gebreyesus Brhane, Lulseged Tamene, Paul L.G. Vlek. 2013. Modeling soil erosion by water using SWAT in northern Ethiopia. East African Journal of science and technology, 2(2):97-123.

200. Tesfahunegna, G. B., b, P. L.G. Vlek, L. Tamene. 2013. Application of SWAT model to assess erosion hotspot for sub-catchment management at Mai-Negus catchment in northern Ethiopia. East African Journal of Science and Technology, 2013, 2(2):97-123.

201. Devkota K. P, Ahmad Manschadi, J.P.A. Lamers , M. Devkota, P.L.G. Vlek. 2013. Mineral nitrogen dynamics in irrigated rice–wheat system under different irrigation and establishment methods and residue levels in arid drylands of Central Asia. Europ. J. Agronomy 47: 65– 76. http://dx.doi.org/10.1016/j.eja.2013.01.009

202. Tesfahunegn, Gebreyesus Brhane, Lulseged Tamene, Paul L. G. Vlek, Kirubel Mekonnen, 2013. Assessing farmers' knowledge of weed species, crop type and soil management practices in relation to soil quality status in mai-negus catchment, northern Ethiopia Land Degradation & Development. 27: 120-133. Land Degrad. Develop. (2013) Published online in Wiley Online Library (wileyonlinelibrary.com) DOI: 10.1002/ldr.223

203. Waswa Boaz S., Paul L.G. Vlek, Lulseged D. Tamene, Peter Okoth, David Mbakaya, Shamie Zingore. 2013. Evaluating indicators of land degradation in smallholder farming systems of western Kenya. Geoderma 195–196: 192–200.

204. Djumaeva, D., J.P.A. Lamers, A. Khamzina and P.L.G. Vlek. 2012. The benefits of phosphorus fertilization of trees grown on salinized croplands in the lower reaches of Amu Darya, Uzbekistan. Agroforestry Systems 87: 555–569. DOI: 10.1007/s10457-012-9576-7

205. Tischbein, B., A. M. Manschadi, C. Conrad, A.-K. Hornidge, A. Bhaduri, M. Ul Hassan, J. P. A. Lamers, U. K. Awan and P. L. G. Vlek. 2013. Adapting to water scarcity: constraints and opportunities for improving irrigation management in Khorezm, Uzbekistan. Water Science & Technology: Water Supply 13.2: 337-348.

206. Devkota, M., C. Martius, J.P.A. Lamers, K.D. Sayre, K.P. Devkota, R.K. Guptac,O. Egamberdiev, P.L.G. Vlek 2013 Combining permanent beds and residue retention with nitrogenfertilization improves crop yields and water productivity in irrigatedarid lands under cotton, wheat and maize. Field Crops Research 149: 105–114

207. Devkota, K.P., A.M. Manschadi, J.P.A. Lamers, E. Humphreys, M. Devkota,O. Egamberdiev, R.K. Gupta, K.D. Sayreg\, P.L.G. Vlek. 2013. Growth and yield of rice (Oryza sativa L.) under resource conservationtechnologies in the irrigated drylands of Central Asia. Field Crops Research 149: 115–126.

208. Tesfahunegn, G.B. and P.L.G. Vlek 2013. Assessing Sediment-Nutrient Export Rate and Soil Degradation in Mai-Negus Catchment, Northern Ethiopia. Soil Science, Volume 2013, Article ID 748561, 10 pages.

209. Craswell, E.T. and P.L.G. Vlek. 2013. Mining of nutrients in African soils due to agricultural intensification. In: Principles of sustainable soil management in agroecosystems. (Eds R. Lal and B.A. Stewart) Advances in Soil Science CRC Press, Boca Raton, Fl. USA.

210. Devkota, M., C. Martius, J.P.A. Lamers, K.D. Sayre, K.P. Devkota, P.L.G. Vlek. 2013 Tillage and nitrogen fertilization effects on yield and nitrogen use efficiency of irrigated cotton. Soil and Tillage research, 134: 72-82.

211. Devkota, K. P., A. M. Manschadi, M. Devkota, J. P. A. Lamers, E. Ruzibaev, O. Egamberdiev, E. Amiri, and P. L. G. Vlek. 2013. Simulating the Impact of Climate Change on Rice Phenology and Grain Yield in Irrigated Drylands of Central Asia. Journal Of Applied

Meteorology And Climatology 52: 2033 – 2050Socio-economic and biophysical determinants of land degradation in Vietnam: An integrated causal analysis at the national level

212. Vu, Quyet Manh, Quang Bao Le, E. Frossard, Paul L.G. Vlek 2014. Socio-economic and biophysical determinants of land degradation in Vietnam: An integrated causal analysis at the national level. Land Use Policy (IF 2.29).; 36:605 - 617. DOI:10.1016/j.

213. Capote-Fuentes, R.T., M.Denich, U.Berger, P.L.G.Vlek. 2013. Testing a theoretical framework on the linear segment of the biomass-density trajectory of forests with data from a mangrove forest. Revista Jard. Bot. Nac.Univ. Habana. 32-33: 173-179.

214. Tamene, Lulseged, Quang Bao Le, Paul L.G. Vlek. 2014. A Landscape Planning and Management Tool for Land and Water Resources Management: An Example Application in Northern Ethiopia. Water Resour Manage DOI 10.1007/s11269-013-0490-1

215. Tesfahunegn, Gebreyesus Brhane, Lulseged Tamene, Paul L. G. Vlek 2014. Soil erosion prediction using Morgan-Morgan-Finney model in a GIS environment in Northern Ethiopia catchment. Applied and Environmental Soil Science 04::1-15. DOI:10.1155/2014/468751

216. Tesfahunegn, Gebryesus Brhane Lulseged Tamene, Paul L. G. Vlek, Kirubel Mekonnen 2014. Assessing Farmers' Knowledge of Weed Species, Crop Type and Soil Management Practices in Relation to Soil Quality Status in Mai-Negus Catchment, Northern Ethiopia. Land Degradation and Development

217. Villamor Grace B., Quang Bao Le, Utkur Djanibekov, Meine van Noordwijk, Paul L.G. Vlek . 2014 Biodiversity in rubber agroforests, carbon emissions, and rural livelihoods: An agent-based model of land-use dynamics in lowland Sumatra. Environmental Modelling & Software 28: 407- 424 (IF 2.26).; DOI:10.1007/s11269-013-0490-1.

218. Maccarthy D.D., W.A. Agyare, P.L.G. Vlek and S.G.K. Adiku. 2013. Spatial Variability of Some Soil Chemical and Physical Properties of an Agricultural Landscape. West African Journal of Applied Ecology; 21(2):47-61

219. Baumert Sophia,, Asia Khamzina, Paul L. G. Vlek. 2014. Soil organic carbon sequestration in Jatropha curcas systemsin Burkina Faso. land degradation & development Land Degrad. Develop. Online Library (wileyonlinelibrary.com) DOI: 10.1002/ldr.2310

220. Devkota, K.P., J.P.A. Lamers, A.M. Manschadi, M. Devkota,A.J. McDonald, P.L.G. Vlek. 2015. Comparative advantages of conservation agriculture basedrice–wheat rotation systems under water and salt dynamics typical for the irrigated arid drylands in Central Asia. Europ. J. Agronomy 62 98–109

221. Devkota M.,, R.K. Gupta, C. Martius,, J.P.A. Lamers , K.P. Devkota, K.D Sayre, P.L.G. Vlek. 2014. Managing soil salinity with permanent bed planting in irrigated production systems in Central Asia Agriculture Ecosystems & Environment (Impact Factor: 3.2). 01/2015; 202:90-97. DOI: 10.1016/j.agee.2014.12.006

222. Kugbe, J.X., M. Fosu and P.L.G. Vlek 2014. Impact of season, fuel load and vegetation cover on fire mediated nutrient losses across savanna agro-ecosystems: the case of northern Ghana. Nutrient Cycling in Agroecosystems (Impact Factor: 1.73). 01/2014; DOI: 10.1007/s10705-014-9635-8

223. Vu, Quyet, Quang Bao Le, P.L.G. Vlek. 2014. Hotspots of human-induced biomass productivity decline and their social-ecological types toward supporting national policy and local studies on combating land degradation. Global and Planetary Change 121:64-77.

224. Devkota M., R.K. Gupta, C. Martius,, J.P.A. Lamers, K.P. Devkota, K.D. Sayre, P.L.G. Vlek 2015. Soil salinity management on raised beds with different furrowirrigation modes in salt-affected landsM. Agricultural Water Management 152: 243–250

225. Nyarko, B. K., B. Diekkrüger, N. van de Giesen and P, L. G. Vlek. 2015. Floodplain wetland mapping in the White Volta River Basin of Ghana. GIScience & Remote Sensing (Impact Factor: 1.48). DOI: 10.1080/15481603.2015.1026555

226. Schmengler, Almut C., and Paul L.G. Vlek. 2015. Assessment of accumulation rates in small reservoirs by core analysis, 137Cs measurementsand bathymetric mapping in Burkina Faso. Earth Surf. Process. Landforms. DOI: 10.1002/esp.3772

227. Devkota, K P.. G. Hoogenboom,. K. J. Boote, U. Singh, J.P. A. Lamers, M. Devkota, P.L.G. Vlek. 2015. Simulating the impact of water saving irrigation and conservation agriculture practices for rice-wheat systems in the irrigated semi-arid drylands of Central Asia. Agricultural and Forest Meteorology 214–215: 266–280.

228. Fosu-Mensah, B. Y., P. L. G. Vlek, G. Manske, and M. Mensah. 2015. The influenec of Azolla pinnata on floodwater chemistry, grain yield and nitrogen uptake of rice in Dano, Southwestern Burkina Faso. Journal of Agricultural Science; Vol. 7, (8): 118-130.

229. Tesfahunegn, G.B., L. Tamene, P.L.G. Vlek, L. Tamene. 2016. Assessing soil properties and landforms in the Mai-Negus Catchment, Northern Ethiopia. Pedosphere 26(5):745-759. DOI:10.1016/S1002-0160(15)60085-6.

230. Sanfo, Safi, B. Barbier, I.W.P. Dabir, P. L.G. Vlek, W.M Fonta, B. Ibrahim, B. Barry. 2017. Rainfall Variability Adaptation Strategies: An Ex-Ante Assessment of Supplemental Irrigation from Farm Ponds in Southern Burkina Faso. Agric. Systems: 152: 80-89.

231. Baumert, S., Khamzina, A., Vlek, P.L.G. 2018. Greenhouse gas and energy balance of Jatropha biofuel production systems of Burkina Faso. Energy for Sustainable Development volume 42, pp. 14 - 23

232. Vlek, Paul L. G., Asia Khamzina, Hossein Azadi, Anik Bhaduri, Luna Bharati, Ademola Braimoh, Christopher Martius, Terry Sunderland and Fatemeh Taheri. 2017. Trade-Offs in Multi-Purpose Land Use under Land Degradation. Sustainability 9, 2196; doi:10.3390/su9122196

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Discussions Papers

1. Vlek, Paul L.G., Daniel Hillel and Sonya Teimann. 2001. Land Degradation: Causes and Prevention. In: Villages in the Future (Virchow and Von Braun, Eds.). Springer Verlag, Berlin. Ch. 25: 169-171.

2. Katyal J.C. and P.L.G. Vlek. 2000. Desertification. – Concept, Causes and Amelioration. ZEF Discussion Paper 33. pp. 65. Bonn Germany

3. Mitra, S. R. Wassmann and P.L.G. Vlek. 2003. Global Invetory of Wetlands and their Role in the Carbon Cycle. ZEF Discussion Paper 64. pp. 44. Bonn, Germany

4. Craswell, E.T. U. Grote, J. Henao, and P.L.G. Vlek. 2004. Nutrient Flows in Agricultural Production and International Trade: Ecology and Policy Issues. ZEF Discussion Paper 78. pp62. Bonn. Germany.

5. Vlek, P.L.G. 2005. Nothing begets Nothing. The creeping disaster of land degradation. InterSecTions No 1. pp 28. United Nations University Institute for Environment and Human Security, Bonn Germany

6. Vlek, P.L.G., C. Martius and J.P.A. Lamers. 2007. Beyond the Aral Sea Syndrome: The ZEF/UNESCO efforts in Uzbekistan. In: Proc. Int, Symp.Water and Better Human Life in the Future. RIHN, November 6-8, 2006, Kyoto, Japan.

7. Vlek, Paul L.G., Quang Bao Le and Lulseged Tamene. 2008. Land decline in Land-Rich Africa- A creeping disaster in the making. CGIAR Science Council. (c/o FAO) Rome, Italy

8. Vlek, Paul L.G. and Lulseged Tamene. 2009. Conservation agriculture: Why?.In: Lead Papers, 4th World Congress on Conservation Agriculture. New Delhi,India. pp 10- 20.

9. Craswell, E. T., Tiessen, H. and Vlek, P. L. G. (2010): Peak Phosphorus: Implications for Agricultural Production, the Environmentand Development. Bonn: Zentrum für Entwicklungsforschung. Discussion Paper 138.

10. Vlek PLG; Khamzina A; Tamene L. (eds.). 2017. Land degradation and the Sustainable Development Goals: Threats and potential remedies. CIAT Publication No. 440. International Center for Tropical Agriculture (CIAT), Nairobi, Kenya. 67 p.

Non-refereed papers.

1. Vlek, P.L.G. l97l. Some Morphological, Physical and Chemical Aspects of Acid Sulphate Soils in Thailand. Soil Survey Report No. 84, Department of Land Development, Bangkok, Thailand.

2. Vlek, P.L.G., and W.L. Lindsay. l977. Molybdenum Contamination in Colorado Pasture Soils, In:

Molybdenum in the Environment, Vol. II, p. 6l9-650, W.K. Chappell and K. Kellogg Petersen, Eds., Marcel Dekker, Inc., New York.

3. Craswell, E.T., and P.L.G. Vlek. l978. Fate of Fertilizer Nitrogen Applied to Wetland Rice, In:

Nitrogen and Rice, Symposium proceedings, International Rice Research Institute, Manila, Philippines, p. l75-l93.

4. Byrnes, B.H., P.L.G. Vlek, and E.T. Craswell. l979. The Promise and Problem of Super Granules

for Rice Fertilization, In: Adoptive Production Systems. S. Ahmed et al. Eds.

5. Craswell, E.T., and P.L.G. Vlek. 1980. Research to Reduce Losses of Fertilizer Nitrogen from Wetland Rice Soils, In: Fertilizers in India in the Eighties, FAI Annual Seminar, December 4-6, 1980, New Delhi, India.

6. Craswell, E.T., and P.L.G. Vlek. l982. Nitrogen Management for Submerged Rice Soils, In:

Vertisols and Rice Soils of the Tropics. Symposia Papers II. 12th International Congress of Soil Science, New Delhi, India.

7. Van der Heide, J., A.C.B.M. van der Kruijs, B.T. Kang, and P.L.G. Vlek. 1985. Nitrogen

Management in Multiple Cropping Systems. In: Nitrogen Management in Farming Systems in Humid and Subhumid Tropics. B.T. Kang and J. van der Heide (Eds.). Symposium Proceedings, Ibadan, Nigeria, p. 291-306.

8. Mokwunye, A.U., and P.L.G. Vlek. 1985. Feeding the African People or Feeding Crops that Feed

the People:Food for Thought. Agribusiness Worldwide, 8: 6-8.

9. Mughogho, S.K., A. Bationo, B. Christianson and P.L.G. Vlek. 1986. Management of Nitrogen Fertilizers for Tropical African Soils. In: Mokwunye, A.U., and P.L.G. Vlek (Eds). "Management of Nitrogen and Phosphorus Fertilizers in Sub-Saharan Africa". Martinus Nijhoff Publishers. The Hague, The Netherlands pp 117-172.

10. Ashby, J.A., and P.L.G. Vlek. 1986. Farming Systems Research of the International Fertilizer

Development Center. IARC Workshop on Farming Systems Research, ICRISAT, Feb. 17-21.

11. Katyal, J.C., C.W. Hong, and P.L.G. Vlek. 1987. Fertilizer Management in Vertisols. In: Proceedings Seminar on Management of Vertisols under Semi-Arid Conditions. IBSRAM Nairobi, Kenya

12. Katyal, J.C., D.K. Friesen, and P.L.G. Vlek. 1987. Deficiencies of Micronutrients and Sulfur

in Wheat. In: Proceedings Conference on Wheat Production Constraints in Tropical Environments. CIMMYT, Chiang Mai, Thailand.

13. Abdelmonem, M.A.S., K. Harmsen, W.L. Lindsay and P.L.G. Vlek, 1988. Fate of nitrogen-

tagged urea applied to wheat in the arid Mediterranean region. In: Matar, A., P.N. Soltanpour and A. Chouinard (Editors). Soil test calibration in West Asia and North Africa. Proceedings of the second regional workshop, Ankara, Turkey, 1-6 September 1987. ICARDA-120 En. ICARDA, Aleppo, Syria. pp.103-110

14. Vlek, P.L.G., and A. Uzo Mokwunye. 1989. Soil Fertility Problems in the Semiarid Tropics of

Africa. In: Soil Technology and Fertilizer Management in Semi-Arid Tropical India. C.B. Christianson (Ed). IFDC Special Publication - 11 Muscle Shoals, Al. 35662, USA.

15. Manske, G.G.B. and P.L.G. Vlek. 1991. Eine Strategie für die Entwicklung von nährstoffeffizienten Pflanzensorten unter Einbezug der VA-Mykorrhiza. (A strategy for developing nutrient efficient varieties (NEV's) with special reference to VA mycorrhiza). In: Ökophysiologie des Wurzelraumes Nr. 2 (84-89), Forschungszentrum für Bodenfruchtbarkeit Müncheberg, Deutschland

16. Vlek, P.L.G., W. Fugger and U. Biker. 1992. The fate of fertilizer N under Azolla in wetland

rice. Proc. 2nd ESA Congress, Warwick Univ., UK., August 1992.

17. Fresco, L.O., and P.L.G. Vlek. 1992. "Temperate" and "Tropical" Agronomy: A Case for Symbiosis. Proc. 2nd European Society for Agronomy Congress, Warwick Univ. U.K., August 1992.

18. Vlek, P.L.G. and H. Koch. 1992. "The Soil Resource Base and Food Production in the

Developing World: Special Focus on Africa". In: Göttinger Beiträge zur Land- und Forstwirtschaft in den Tropen und Subtropen 71: 139-160.

19. Lüttger, A.B., G.G.B. Manske, R.K. Behl and P.L.G. Vlek. 1993. Nährstoff-aneignung von

Weizensorten in Abhängigkeit von VA-Mykorrhiza und Gesamtwurzellänge: Felduntersuchungen in Nordindien. (Nutrient uptake by wheat varieties as a function of VA mycorrhiza and root length: Field studies in north India). In: Ökophysiologie des Wurzelraumes Nr. 4 (49-52). Zentrum für Agrarlandschafts- und Landnutzungsforschung (ZALF), Müncheberg, Deutschland

20. Manske, G.G.B., and P.L.G. Vlek. 1994. The Prospects of Developing Nutrient Efficient

Varieties (NEV) for Wheat Based on Symbiosis with VA Mycorrhizal Fungi. In: Crop Tolerance to Abiotic Stresses. R.K. Behl,(Ed.). Proc. Nat. Conf. Plant Res. Develop., Feb. 26-28, 1990. CCS Haryana Agric. Univ. Press, Hisar. pp. 171-188.

21. Vlek, P.L.G., and K. Vielhauer. 1994. "Nutrient Management Strategies in Stressed

Environments". In: Stressed Ecosystems and Sustainable Agriculture. S.M. Virmani, J.C. Katyal, H. Eswaran and I.P. Abrol (Eds.). pp 203-229. Oxford & IBH Publishing Co., New Delhi, India.

22. Lüttger, A.B., G.G.B. Manske, R.K. Behl, and P.L.G. Vlek. 1994. Felduntersuchungen in

Nordindien zur Charakterisierung von "Low-Input"-Weizengenotypen mit Hilfe von Spross- und Wurzelparametern. (Field studies in North-India to characterize Low-input-wheat genotypes using plant canopy and root parameters.) Ökophysiologie des Wurzelraumes Nr. 5 (104-107).

23. Diekmann, U., M. Denich, and P.L.G. Vlek. 1995. Characterization of Soil Microbiological

Processes in Different Phases of the Cultivation System (Slash-and-Burn) in the Bragantina Zone of the State of Pará, Brazil. In: Management and Rehabilitation of Degraded Lands and Secondary Forests in Amazonia. J.A. Parrotta, and M. Kanashiro (Eds.). Proc. Intern. Symposium/Workshop Santarém, Pará, Brazil 18-22.4.1993. Intern. Inst. Trop. Forestry (IITF), USDA-Forest Service, Río Piedras, Puerto Rico, USA: pp. 40-43.

24. Thielen-Klinge, A., A. Wanisch, M. Denich, M.M.L.S. Santos, and P.L.G. Vlek. 1995. Natural

Abundance of 15N in Fallow Vegetation of Northeast Pará State, Brazil - Preliminary Results. In: Management and Rehabilitation of Degraded Lands and Secondary Forests in Amazonia. J.A. Parrotta, and M. Kanashiro (Eds.). Proc. Intern. Symposium/Workshop Santarém, Pará, Brazil 18-22.4.1993. Intern. Inst. Trop. Forestry (IITF), USDA-Forest Service, Río Piedras, Puerto Rico, USA: pp. 108-1

25. Wiesenmüller, J., M. Denich, and P.L.G. Vlek. 1995. "Vegetative Fallow Regeneration in the

Eastern Amazon Region, Brazil". In: Management and Rehabilitation of Degraded Lands and Secondary Forests in Amazonia. J.A. Parrotta, and M. Kanashiro (Eds.). Proc. Intern. Symposium/Workshop Santarém, Pará, Brazil 18-22.4.1993. Intern. Inst. Trop. Forestry (IITF), USDA-Forest Service, Río Piedras, Puerto Rico, USA: pp. 111-114.

26. Edi Premono, M., A.M. Moawad, and P.L.G. Vlek. 1996. "Effect of phosphate-solubilizing Pseudomonas putida on the growth of maize and its survival in the rhizosphere". Indones. J. Crop Sci. 11 (1): 13-23.

27. Vlek, P.L.G., A.B. Lüttger, and G.G.B. Manske. 1996. The Potential Contribution of

Arbuscular Mycorrhiza to the Development of Nutrient and Water Efficient Wheat. In: Tanner, D.G., Payne, T.S., and Abdalla, O.S. Eds. 1996. The Ninth Regional Wheat Workshop for Eastern, Central and Southern Africa. Addis Ababa, Ethiopia: CIMMYT. pp. 28-46.

28. Wiesenmüller, J., M. Denich, and P.L.G. Vlek. 1997. "Bedeutung des Wurzelsystems für die

Regeneration der Brachevegetation in Nordost-Brasilien. (Significance of the root system for the regeneration of the fallow vegetation on N. E. Brazil). In : Rhizosphärenforschung, Umweltstreß und Ökosystemstabilität".7. Borkheider Seminar zur Ökophysiologie des Wurzelraumes. (Ed. W. Merbach) B.G. Teubner Verlagsges. Stuttgart: pp. 84-89.

29. Bationo, A., and P.L.G. Vlek. 1998. The Role of Nitrogen Fertilizers Applied to Food Crops in

the Sudano-Sahelian Zone of West Africa. In: Renard, G., Neef, A., Becker, K. and von Oppen, M. Eds. 1998. Soil Fertility Management in West African Land Use Systems. Proc. Regional Workshop Univ. Hohenheim, ICRISAT Sahelian Centre and INRAN 4-8 March 1997, Niamey, Niger. Margraf, Weikersheim: pp. 41-51.

30. Schultz, C., G. Ginting, A.M. Moawad and Paul L.G. Vlek. 1999. The role of (vesicular-)

arbuscular mycorrhiza in the weaning stage of micropropagated oil palms. Mitteilungen aus der Biologischen Bundesanstalt für Land- und Forstwirtschaft Berlin-Dahlem, Heft 363, 1999: 74-82.

31. Kühne, Ronald F., Paul L.G. Vlek and H. Tiessen. 1999. Maintaining soil quality in tropical

cropping systems. Mitteilungen der Gesellschaft für Pflanzenbauwissenschaften, Band 12, 1999: 11-16.

32. Sommer, R. T:D:A: de Sá, K. Vielhauer, P.L.G. Vlek and H. Foelster. 2001. Water and nutrient balance under slash-and-burn agriculture in the Eastern Amazon, Brazil –The role of a deep rooting fallow vegetation. IN: Plant nutrition – Food Security and sustainable agro-ecosystems 1014 – 1015- (Horst et al, Eds) Kluwer Academic Publishers, Dordrecht, The Netherlands

33. Manske G.G.B., J.I. Ortiz-Monasterio and P.L.G. Vlek. 2001. Techniques for measuring

genetic diversity in roots. In: Application of Physiology in Wheat Breeding. (Reynolds et al., Eds). CIMMYT; Mexico. Ch. 18: 208-218.

34. Vlek, Paul L.G., Daniel Hillel, J.C. Katyal and Wolfgang Seiler. 2001. Water deficiency and

desertification. In: Ehlers and Krafft (Eds). Understanding the Earth System. Springer Berlin,Germany. 275 – 279.

35. Somado, E.A., R.F. Kuehne, M. Becker, K.L. Sahrawat and P.L.G. Vlek. 2002. Improving phosphate rock solubility and uptake and yield of lowland rice grown on an acidic soil amanded with legume green manure. In: Integrated plant nutrient management in Sub-saharan Africa: From concept to Practice. (Vanlauwe et al, Eds) CABI Publishing, Wallingford, U.K. pp.251-263

36. Macale, M.A.R. de, and P.L.G. Vlek. 2002. The role of Azolla cover in improving the

nitrogen use efficciency of lowland rice. In: 2nd international conference on sustainable agriculture for food, energy and industry (Li Dajue, Ed.) Institute of Botany, Chinese Academy of Sciences. pp. 921- 930.

37. Gole, T.W., M. Denich, q, teketay and P.L.G. Vlek, 2002 Human impact in the Coffea arabics genepool in Ethiopia and the need forits in situ conservation. IN:Managing plant genetic diversity. (eds.: Engele, Rao, Brown and Jackson). IPGRI, Rome Italy

38. Bationo, A., U. Mokwunye, P.L.G. Vlek, S. Koala and B.I. Shapiro. 2003 Soil fertility management for sustainable land use in the West African Sudano-Sahelian Zone. In: Soil fertilkity management in Africa: A regional perspective.Academic Science Publishers, African Academy of Sciences, Nairobi, Kenya

39. Ibrakhimov, M. S. Park and P.L.G. Vlek. 2004. Development of groundwater salinity in a

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44. Reuter, M., Tiessen, H., Jimenez-Osornio, J.J., Pohlan, J., and Vlek, P.L.G. 2007. Establishment of Cordia dodecandra A. DC. with Bixa orellana L. on Calcareous Soils in Yucatán, Mexico. chapter 12 in: S. Jose and A.M. Gordon (eds.), Towards Agroforesty Design: An Ecological Approach. Springer, pp. 197-208

45. Kaizzi CK, Ssali H., Nansamba A and Paul L.G. Vlek. 2007. The Potential benefits of Azolla,

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46. Anhar, A; Sommer, R; Becker, M and P.L.G. Vlek. 2007. The isotope 15N enrichment technique to measure the biological nitrogen fixation in cacao agroforestry system in Central Sulawesi Indonesia. Agrista, 54-59.

47. Braimoh, A.K. and P.L.G. Vlek. 2008. Impact of land use on soil resources. IN: Land Use and Soil Resources. (Eds. A.K. Braimoh and P.L.G. Vlek) Springer Science, Dordrecht, The Netherlands. pp 1-8.

48. Tamene, L. and P.L.G. Vlek. 2008. Soil ersosion studies in Northern Ethiopia. IN: Land Use and Soil Resources. (Eds. A.K. Braimoh and P.L.G. Vlek) Springer Science, Dordrecht, The Netherlands. pp 73-100.

49. Vlek, P.L.G., D. Hillel and A.K. Braimoh. 2008. Soil degradation under irrigation. IN: Land Use and Soil Resources. (Eds. A.K. Braimoh and P.L.G. Vlek) Springer Science, Dordrecht, The Netherlands. pp. 101-119.

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51. Grote, U., E.T. Craswell and P.L.G. Vlek. 2008. Nutrient and virtual water flows in traded agriculturalcommodities. IN: Land Use and Soil Resources. (Eds. A.K. Braimoh and P.L.G. Vlek) Springer Science, Dordrecht, The Netherlands. pp. 121-143.

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53. Martius, C. J.P.A. Lamers, P.L.G. Vlek (2009): Integrierte Ansätze zu Land- und Wassermanagement in Zentralasien: ein Pilotprojekt im Distrikt Khorezm im Aralseegebiet. Pp. 238-249 in: M. Kramer (Ed.), Wasserprobleme in Zentralasien. DUV (Gabler Edition Wissenschaft), Reihe "Studien zum internationalen Umweltmanagement".

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55. Manschadi, A.M., L. Oberkircher, B. Tischbein, C. Conrad, A,-K. Hornidge, A. Badhuri, G. Schorcht, J.P.A. Lamers, P.L.G. Vlek. 2010. „White Gold“ and Aral Sea disaster – Towards more efficient use of water resources in the Khoresm Region, Uzbekistan. Lohmann Information 45: 34-47.

56. Tischbein, B., Manschadi, A. M., Hornidge, A. K., Conrad, C., Lamers, J. P. A., Oberkircher, L., Schorcht, G. & Vlek, P. L. G. 2011. Ansätze für eine effizientere Wassernutzung in der Provinz Khorezm, Usbekistan (Proposals for the more efficient utilization of water resources in the Province Khorezm, Uzbekistan). Hydrologie und Wasserbewirtschaftung 55 (2), 116–125.

57. Kihara, J., A. Bationo, D.N. Mugumdi, C. Martius and P.L.G. Vlek. 2011. Conservation tillage, local organic resources and nitrogen fertilizer combinations affect maize productivity, soils structure and nutrient balances in semi-arid Kenya. IN: Innovations as key to the green revolution in Africa. (Eds.: A. Bationo, B. Waswa, J.M. Okeyo, F. Maina and J. Kihara. Springer, Dordrecht, NL. pp 155-168.

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63. Vlek, P.L.G., J.P.A. Lamers, Chr. Martius, I. Rudenko, A. Manschadi and R. Eshchanov. 2012. Cotton, water, salts and Soums – Research and capacity building for decision in Khoresm, Uzbekistan. In: Cotton, Water, Salts and Soums (Eds.: Chr. Martius, I. Rudenko, J.P.A. Lamers and P.L.G. Vlek) Springer, Dordrecht, The Netherlands.

64. Kienzler, K. N. Ibraghimov, J.P.A. Lamers, R. Sommer and P.L.G. Vlek. 2012. Groundwater contribution to N fertyilization in irrigated cotton and winter wheat in the Khoresm region, Uzbekistan. In: Cotton, Water, Salts and Soums (Eds.: Chr. Martius, I. Rudenko, J.P.A. Lamers and P.L.G. Vlek) Springer, Dordrecht, The Netherlands.

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