Fertilizer Calculator

This calculator determines NPK (nitrogen, phosphorus, potassium) requirements based on crop type, yield goals, and existing soil nutrient levels from soil tests. It calculates the deficit that needs to be supplied through fertilization.

1. 1

   Step 1

   Select your crop type from the dropdown

2. 2

   Step 2

   Enter the field area in acres

3. 3

   Step 3

   Set your target yield in bushels per acre

4. 4

   Step 4

   Input soil test results for N, P, and K

5. 5

   Step 5

   Review the calculated fertilizer requirements

• 1

  Soil test every 2-3 years to track nutrient trends

• 2

  Corn typically needs 1.0-1.2 lbs N per bushel of yield goal

• 3

  Split nitrogen applications improve efficiency and reduce loss

• 4

  Soybeans fix their own nitrogen but need P and K

• 5

  Fall application of P and K is often more cost-effective

• Applying fertilizer without current soil test results

• Over-applying nitrogen which wastes money and pollutes water

• Ignoring micronutrient deficiencies (zinc, sulfur, etc.)

• Not crediting nitrogen from previous legume crops