Nutrient management and application calculators. Browse our free nutrients tools below — all calculators are instant, accurate, and require no sign-up.
Cover Crop Nitrogen Fixation Calculator — Estimate nitrogen fixed by legume cover crops based on biomass production. Calculate N credits for the following cash crop.
Green Manure Nitrogen Credit Calculator — Estimate nitrogen credit from green manure legume crops based on species, biomass, and termination timing. Free N credit estimator.
Nitrogen Application Rate Calculator — Calculate nitrogen fertilizer application rate based on yield goal and nitrogen factor minus credits. Free online N rate tool for farmers.
Nitrogen Mineralization Rate Calculator — Estimate nitrogen mineralization rate from soil organic matter, temperature, and moisture. Calculate seasonal N supply from soil biology.
Phosphorus Need Calculator — Calculate phosphorus (P₂O₅) fertilizer need based on soil test results, yield goal, and crop removal rates. Free online P rate tool.
Nutrient Removal by Crop Calculator — Calculate N, P₂O₅, and K₂O removed by harvested crops based on yield and crop-specific nutrient content. Plan maintenance fertilization.
Potassium Need Calculator — Calculate potassium (K₂O) fertilizer need from soil test K, yield goal, crop removal, and CEC. Free K rate recommendation tool.
Residual Nitrogen Credit Calculator — Calculate residual nitrogen credit from the previous crop. Estimate carryover N from legumes, excess fertilizer, and manure history.
Sulfur Application Rate Calculator — Calculate elemental sulfur application rate to lower soil pH based on current pH, target pH, and soil texture. Free S rate tool.