Slide 1
Soil and Soil Fertility Management in OFC Production
1. Physical factors2. Chemical factors1. Climate2. Parent material3. Biosphere4. Topography5. Time
RocksParent MaterialsSoilWeathering
Soil Genesis
2
Components of Soil(Volume Basis)Composition varies Place to place / Time to timeWaterAirMineral MatterOrganic Matter
3
Soil Properties
TextureStructureDensityPorosityColourMoisture ContentWater Holding CapacityPhysical Properties
Chemical PropertiesNutrient ContentpHCation Exchange CapacityElectrical ConductivityRedox Potential
Biological PropertiesMacro OrganismsMicro Organisms
4
Soils of the Dry Zone
5
Dry Zone of Sri LankaExtent-4.17 million ha.(Sri Lanka - 6.66 million ha.)Climate- 4< 15Alkalinity> 8.5< 4> 15
Salinity Patches
Complete Stalinization
Causal Factors of Salinity Irrigation
Higher evaporation with lower RF
Poor drainage
High salt content in the soil profile
Higher water table
Effects of salinityFor SoilFor Plants Physiological drought ness Na / Cl toxicities Difficulties in uptaking K, Ca, Zn Soil dispersion Increase nitrogen losses due high pH Organic matter mineralization due high pH
Remedial Measures Drainage improvement Washing out using quality water Deep ploughing + smooth surface preparation Water management Mulching Optimum nutrient supply Organic matter usage Gypsum amendment Possible land use options
Thank You
Chart24511152525
Mineral Matter %Organic Matter %Water %Air %25%
Sheet1Mineral Matter %Organic Matter %Water %Air %4552525
Sheet10111000
Mineral Matter %Organic Matter %Water %Air %Constituents of Soil
Sheet2
Sheet3