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

2. Nitrogen Cycle

3. Nitrogen Cycle

4. Nitrogen Cycle

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

6. Nitrogen Cycle

7. The Haber-Bosch processN2 H2
N2(g) + 3H2(g) → 2NH3(g) ΔHo
NH3

10. Phosphorus Leaching in FL soils

11. Eutrophication
Polluted Water

12. Readily available
Less available
Very less available

13. Where Potash comes from?
Mining Equipment
Sylvinite
Potash Pile

14. Carbon Cycle

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

16. 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