Not Very Accurate rates This app apparently doesn't compensate for different areas of the country, because it recommended 125 units for corn on corn, which is at least 60-80 units below what we need here.
Calculate grain yields, maturity rates, and silage price adjustments.
Bean Cam - Wisconsin's Soybean Replant Calculator
Calculate the price per pound of nitrogen using different types of fertilizers.
NPK Credits - Manure & Legume Nutrient Credit Calculator