How does the Iowa calculator determine nutrient replacement?
Overview:
The Iowa calculator can be used to determine phosphorus and potassium removal/replacement for corn and soybeans.
Answer:
The Iowa calculator utilized the following equations:
|
Crop |
Phosphorus |
Potassium |
|
Corn |
P Rec = 0.32 * Yield |
K Rec = 0.22 * Yield |
|
Soybeans |
P Rec = 0.75 * Yield |
K Rec = 1.20 * Yield |
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