Nitrogen fertilization Essential to the optimal nutrient supply of the plants. Useful effects:...
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5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija Som e harm fulor usefulenvironm ental effectofnitrogen fertilizers ERZS ERZS É É BET N BET N Á Á DASY DASY - - M IKL M IKL Ó Ó S N S N Á Á DASY DASY U niversity ofV eszprém , G eorgikon Faculty ofA griculture, Institute for PlantProtection, K eszthely
Nitrogen fertilization Essential to the optimal nutrient supply of the plants. Useful effects: –more crop –better quality Harmful effects: –leaching
Nitrogen fertilization Essential to the optimal nutrient supply
of the plants. Useful effects: more crop better quality Harmful
effects: leaching to the groundwater or surface water get into the
food chain as nitrate direct or indirect effect on animals living
in the soil : changing pH and salinity of the soil, influences
feeding of the pests E. Ndasy-M. Ndasy: Some harmful or useful
environmental effect of nitrogen fertilizers 5th ALPS-ADRIA
SCIENTIFIC WORKSHOP 2006. Opatija
Slide 3
E. Ndasy-M. Ndasy: Some harmful or useful environmental effect
of nitrogen fertilizers Transformation of nitrate in the plants and
in the human organizm 5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006.
Opatija
Slide 4
E. Ndasy-M. Ndasy: Some harmful or useful environmental effect
of nitrogen fertilizers Classification of vegetables on the basis
of accumulated nitrate (Terbe et al., 1986)
Slide 5
5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija E. Ndasy-M.
Ndasy: Some harmful or useful environmental effect of nitrogen
fertilizers Classification of the plants according to the nitrate
content NO 3 mg/kg fresh mass Nitrate content of the plant < 500
low 500-1500medium 1500-2500high 2500 > very high
Slide 6
5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija E. Ndasy-M.
Ndasy: Some harmful or useful environmental effect of nitrogen
fertilizers Maximum level of nitrate in vegetables in EU
Slide 7
5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija E. Ndasy-M.
Ndasy: Some harmful or useful environmental effect of nitrogen
fertilizers Determinants of nitrate accumulation of plants
Genetical factors:Environmental factors: - species and varieties of
plant - characteristics of soil - stadium of growth - period and
intensity of light - plant part - temperature - water supply
Cultivation factors: Food-industrial processes -plant nutrition,
mainly N -plant protection, pesticides -time of sowing and
harvesting, growing period
Slide 8
Effect of N-fertilizers on nitrate content of pea leaves At
ripening In blossom At 4-6 leaf stage 0 800 1600 2400 3200 4000
4800 5600 6400 04080160320640 N-treatments (mg N/kg soil) NO 3
mg/kg fresh mass NH4NO3 (NH4)2SO4 Ca(NO3)2 0 800 1600 2400 3200
4000 4800 5600 6400 04080160320640 N-treatments (mg N/kg soil) NO 3
mg/kg fresh mass NH4NO3 (NH4)2SO4 Ca(NO3)2 0 800 1600 2400 3200
4000 4800 5600 6400 04080160320640 N-treatments (mg N/kg soil) NO 3
mg/kg fresh mass NH4NO3 (NH4)2SO4 Ca(NO3)2. Ndasy-M. Ndasy: Some
harmful or useful environmental effect of nitrogen fertilizers 5th
ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija
Slide 9
Effect of nitrogen fertilization on lettuce varieties Methods
pot experiment in green house four replications Ramann brown forest
soil varieties: Kobak, Mjus kirlya, Great lakes 0, 100, 400, 800 mg
N/kg soil as NH 4 NO 3 irrigation by weigh to 70% of MWHC leaf
samples were collected at 8 week age E. Ndasy-M. Ndasy: Some
harmful or useful environmental effect of nitrogen fertilizers 5th
ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija
Slide 10
Nitrate concentration of different lettuce varieties influenced
by N- fertilizer doses 0 1000 2000 3000 4000 5000 6000 0100400800
N-treatments mg /kg soil mg NO 3 /kg fresh mass kobak mjus kirlya
great leaks E. Ndasy-M. Ndasy: Some harmful or useful environmental
effect of nitrogen fertilizers LSD5%:227
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Effect of nitrogen and water supply on lettuce Methods pot
experiment in green house four replications Ramann brown forest
soil variety: Balaton zld 0, 100, 200, 300, 400 mg N/kg soil as NH
4 NO 3 irrigation by weigh to 40, 60, 80 % of MWHC leaf samples
were collected at 6 week age E. Ndasy-M. Ndasy: Some harmful or
useful environmental effect of nitrogen fertilizers 5th ALPS-ADRIA
SCIENTIFIC WORKSHOP 2006. Opatija
Slide 12
Effect of nitrogen and water supply on fresh mass of lettuce E.
Ndasy-M. Ndasy: Some harmful or useful environmental effect of
nitrogen fertilizers 5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006.
Opatija
Slide 13
Effect of nitrogen and water supply on nitrogen concentration
of lettuce E. Ndasy-M. Ndasy: Some harmful or useful environmental
effect of nitrogen fertilizers 5th ALPS-ADRIA SCIENTIFIC WORKSHOP
2006. Opatija
Slide 14
Effect of N-fertilization and water supply on nitrate content
of lettuce E. Ndasy-M. Ndasy: Some harmful or useful environmental
effect of nitrogen fertilizers 5th ALPS-ADRIA SCIENTIFIC WORKSHOP
2006. Opatija
Slide 15
Interaction between N-fertilization, cockchafer grub and
entomophatogenic nematodes Methods Pot experiment in laboratory, 14
day period 4 cockchafer grub+1500 pieces of Steinernema glaseri/
pot E. Ndasy-M. Ndasy: Some harmful or useful environmental effect
of nitrogen fertilizers 5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006.
Opatija 0, 100, 200, 300 mg N/kg soil as ammonium-nitrate ammonium
nitrate+calcium- carbonate (Ptis) carbamide calcium-nitrate
(Kalcinol)
Slide 16
Mortality of cockchafer grub effected by Steinernema glaseri
influenced by nitrogen fertilizers E. Ndasy-M. Ndasy: Some harmful
or useful environmental effect of nitrogen fertilizers 5th
ALPS-ADRIA SCIENTIFIC WORKSHOP 2006. Opatija LSD 5% :11,5
Slide 17
Conclusions We must keep away from overdosage of N- fertilizer
in lettuce growing. It was established that we can decrease nitrate
content of lettuce with optimal water supply. We must prefer
genetically low nitrate storable varieties. N-fertilizers can
effect on pests and nematodes living in the soil. N-fertilizers had
not any negative effect on cockchafer grubs. Nematodes were more
sensitive to fertilization. 5th ALPS-ADRIA SCIENTIFIC WORKSHOP
2006. Opatija E. Ndasy-M. Ndasy: Some harmful or useful
environmental effect of nitrogen fertilizers
Slide 18
Thank you for your attention! E. Ndasy-M. Ndasy: Some harmful
or useful environmental effect of nitrogen fertilizers THANK YOU
FOR YOUR ATTENTION! 5th ALPS-ADRIA SCIENTIFIC WORKSHOP 2006.
Opatija