Home
Back
Purdue Fertilizer Equation:
| From: | To: |
The Purdue Fertilizer Equation calculates the nitrogen requirement for crops based on yield goal and existing soil nitrogen. It helps farmers optimize fertilizer application for maximum crop production while minimizing environmental impact.
The calculator uses the Purdue equation:
Where:
Explanation: The equation accounts for the nitrogen needed to achieve the target yield while subtracting the nitrogen already available in the soil.
Details: Proper nitrogen management is crucial for crop productivity, economic efficiency, and environmental protection. Over-application can lead to water pollution while under-application reduces yields.
Tips: Enter realistic yield goals based on field history and soil tests. Soil nitrogen values should come from recent soil tests for accurate results.
Q1: What crops is this equation suitable for?
A: Primarily developed for corn production in the Midwest, but can be adapted for other crops with appropriate adjustments.
Q2: How often should soil nitrogen be tested?
A: Ideally before each growing season, especially if manure or other organic amendments have been applied.
Q3: What factors affect the 1.2 conversion factor?
A: Soil type, organic matter content, and previous crop can influence this value. Local extension services may recommend adjustments.
Q4: Should other nutrients be considered?
A: Yes, phosphorus, potassium and micronutrients are also important for crop growth and should be managed according to soil tests.
Q5: How does this compare to other nitrogen recommendation systems?
A: The Purdue system is relatively simple compared to more complex models but provides a good starting point for nitrogen management.