1. Nutrients needed (lbs/ acre)
These are based on your soil report recommendation and on the crop to be grown and average yield. Refer to the table of common crop uptake values, or use fertilizer guides, or contact your county Cooperative Extension agent or NRCS office for this information.
2. Nutrients from other sources (credits) (lbs / acre)
These may include residual nitrate-N from soil tests, supplemental fertilizers, N in irrigation water, previous legume crop credits, or nutrients from previous manure applications.
3. Additional nutrients needed
The Excel spreadsheet will subtract line 2 from line 1.
4. Total N and P2O5 in manure
Enter the total N and P2O5 in manure from you manure test report. Total N and P2O5 in manure (on a fresh weight or as-sampled basis) is based on a recent manure report or book estimate for your manure type. If you do not have a recent manure test contact your local Extension or NRCS office for more information.
5. Nutrient Availability Factor
Enter the nutrient availability factor on line 5. Nutrients, particularly nitrogen, are released over time as manure decomposes in soil. The nutrient availability factor is the fraction of total N or P2O5 in manure available in the year of application. See Table 4 - Estimate of Available Nitrogen for more information.
6. Available nutrients in manure
The Excel spreadsheet will multiply line 4 by line 5.
7. Manure Application Rate
The Excel spreadsheet will divide line 3 by line 6. This will give you your manure application rate.