Carolina Medina Soil & Water Science Dept. University of Florida

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Carolina Medina Soil & Water Science Dept. University of Florida Soil Fertility Carolina Medina Soil & Water Science Dept. University of Florida

Nitrogen Cycle

Nitrogen Cycle

Nitrogen Cycle

Nitrogen Cycle Run off from fertilizers Plant Uptake Leaching NO3- Transport Mechanisms Run off from fertilizers Leaching NO3- Plant Uptake NH4+, NO3-

Nitrogen Cycle

The Haber-Bosch process N2 H2 N2(g) + 3H2(g) → 2NH3(g) ΔHo NH3

Phosphorus Leaching in FL soils

Eutrophication Polluted Water

Readily available Less available Very less available

Where Potash comes from? Mining Equipment Sylvinite Potash Pile

Carbon Cycle

Importance of Soil Organic Matter Soil Chemical Properties Cation-exchange capacity Soil Physical Properties Soil aggregation Water holding capacity Energy source for microbes

Factors determining SOM levels Microbial Activity pH Soil Moisture Soil Aeration Soil Temperature C/N Ratio Physical Factors Surface placement Particle Size Environmental Factors Climate Vegetation

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