Crop Management · December 2025 · 5 min read
Every bushel of grain that leaves your farm takes measurable amounts of nitrogen, phosphorus, and potassium with it. Understanding crop nutrient removal rates is essential for maintaining long-term soil fertility and avoiding nutrient depletion. By matching fertilizer applications to removal rates, you can build a sustainable fertility program that keeps soils productive for generations.
Corn is a heavy nutrient user, removing significant amounts of all three major nutrients with every bushel harvested. A 200-bushel corn crop removes approximately 180 lbs of nitrogen, 78 lbs of P2O5, and 54 lbs of K2O from the field.
Soybeans remove relatively high amounts of phosphorus and potassium per bushel. A 60-bushel soybean crop removes about 48 lbs of P2O5 and 84 lbs of K2O. Soybeans fix their own nitrogen but still pull significant P and K from the soil.
Wheat at 80 bushels per acre removes approximately 1.18 lb N, 0.54 lb P2O5, and 0.31 lb K2O per bushel. Straw removal increases potassium removal substantially.
A maintenance approach replaces exactly what the crop removes each year, keeping soil test levels stable. A build approach applies more than removal rates to raise low soil test levels to optimum ranges. Once soils reach optimum P and K levels, switching to a maintenance strategy saves input costs while preserving fertility.
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Try the Crop Rotation PlannerCalculate your total nutrient removal by multiplying removal per bushel by your expected yield. Compare this to your current fertilizer plan to identify gaps. Soil testing every 2-3 years verifies that your replacement strategy is working. Fields that consistently test below optimum may need higher application rates to offset years of underinvestment.