Soil Nitrogen Calculator
Calculate precise nitrogen fertilizer requirements based on soil test results and crop type. Includes commercial product conversion and split application schedules.
Application Strategy: --
About
Nitrogen management is the single most variable factor in crop yield potential. Insufficient nitrogen leads to chlorosis and stunted growth, while excessive application results in economic loss and environmental hazards through nitrate leaching. This calculator bridges the gap between laboratory soil test results and field application.
By factoring in the specific nitrogen uptake requirements of distinct crops and the mineralization potential of organic matter, this tool determines the exact mass of nitrogen required per unit of area. It further converts this raw elemental requirement into application rates for specific commercial and organic fertilizer compounds (e.g., Urea, Ammonium Nitrate, Blood Meal), mitigating the risk of nutrient burn caused by calculation errors.
Formulas
The calculation of nitrogen deficit follows a mass balance approach:
To determine the weight of the commercial product required based on its analysis:
Reference Data
| Fertilizer Source | N-P-K Value | Nitrogen Content (%) | Solubility | Acidifying Effect |
|---|---|---|---|---|
| Urea | 46-0-0 | 46% | High | Moderate |
| Ammonium Nitrate | 34-0-0 | 34% | High | High |
| Ammonium Sulfate | 21-0-0 | 21% | High | Very High |
| Calcium Nitrate | 15.5-0-0 | 15.5% | High | Low |
| Diammonium Phosphate (DAP) | 18-46-0 | 18% | Moderate | Moderate |
| Monoammonium Phosphate (MAP) | 11-52-0 | 11% | Moderate | High |
| Blood Meal (Organic) | 12-0-0 | 12% | Low (Slow Release) | Low |
| Feather Meal (Organic) | 13-0-0 | 13% | Very Low | Low |
| Cottonseed Meal | 6-2-1 | 6% | Low | Low |
| Fish Emulsion | 5-1-1 | 5% | High | Low |