The Tri-State calculator can be used to determine phosphorus and potassium removal/replacement for corn and soybeans.
The Tri-State calculator utilizes the following equations:
Crop
Phosphorus
Potassium
Corn
P Rec = 0.37 * Yield
K Rec = 0.27 * Yield
Soybeans
P Rec = 0.80 * Yield
K Rec = 1.40 * Yield
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