Part 1, Section 2: Soil Fertility Management
Soil Fertility Management
MANURE NUTRIENT MANAGEMENT
Sample Manure Calculations
(See sample manure calculations.)
Because of the natural variations in soils and manures, and because of the assumptions required in making the following calculations, the rates calculated in the examples on the next page should be considered guidelines for determining the actual rates. Actual rates should be close to or less than the maximum rates calculated here.
If a rate less than the maximum is applied, it will need to be supplemented with one or more fertilizer nutrients. The supplemental fertilization rate is determined by subtracting the nutrients applied in the manure from the crop requirement. In the following examples, applying the maximum rate would mean applying more phosphorus and potash than is recommended on the soil test. When applying an excess, check whether it will be used by other crops in the rotation. If not, a lower rate is more appropriate. If you select a lower rate, supplement it with nitrogen fertilizer and possibly phosphate and/or potash fertilizer, depending on the rate used.