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Soil Fertility
Carolina MedinaSoil & Water Science Dept.
University of Florida
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Nitrogen Cycle
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Nitrogen Cycle
Crop Residue
Animal Manure Chemical Fertilizers
Bacteria Fixation
Lightning Fixation
N Sources
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Nitrogen Cycle
DenitrificationN2
NO3-
N2O
Nitrification
NH4+ NO3
-
Mineralization
Organic N NH4+
N Processes
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Nitrogen Cycle
Plant Uptake
NH4+, NO3
-
Leaching
NO3+
Run off fromfertilizers
TransportMechanisms
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The Harber-Bosch process
NN 22 HH 22
NHNH 33
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Phosphorus Leaching in FL soils
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Eutrophication
Polluted Water
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Very less availableLess available
Readily available
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Where Potash comes from?
Sylvinite
Potash Pile
Mining Equipment
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Carbon Cycle
http://epa.gov/climatechange/kids/carbon_cycle_version2.html
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Importance of Soil Organic Matter
Soil Chemical PropertiesCation-exchange capacity
Soil Physical PropertiesSoil aggregation Water holding capacity
Energy source for microbes
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Factors determining SOM levelsMicrobial Activity
pHSoil MoistureSoil AerationSoil TemperatureC/N Ratio
Physical FactorsSurface placementParticle Size
Environmental FactorsClimateVegetation