Fertilizer & Soil
NPK Fertilizer Calculator
Calculate exact nitrogen, phosphorus, and potassium application rates based on soil test results and field size.
Input
Fill in the fields below, then click Calculate.
acres
Recommended Rates (lbs/acre)
lbs/acre
lbs/acre
lbs/acre
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Tips & Best Practices
- Always base fertilizer rates on a current soil test (within 2-3 years).
- Split nitrogen applications improve efficiency and reduce leaching.
- Consider previous crop credits when calculating nitrogen needs.
- Phosphorus and potassium can be applied in fall or spring.