Step 5

Calculating Manure Application Rates

            picture NRCS

Calculating the correct rate of manure to apply is important to prevent the buildup of excess nitrogen or phosphorus in soil and the contamination of ground and surface water.

This step will help you determine the proper manure application rate, as well as how much supplemental nitrogen is needed.

To get started, read the complete text of Step 5 (link at the bottom of the page). Then, read over this page, and follow the directions provided for filling out the worksheets. File the completed worksheets and record keeping forms in an organized manner for later reference.


After completing this section you should: 

  • Be able to calculate manure application rates for individual fields and manure sources.
  • Have determined whether or not you need to apply supplemental nitrogen.
  • Have initiated the record keeping process with regard to manure applications.

Information you will need: 

  • Soil and Manure test results ( see Step 4 )
  • The nutrient needs of the crop you intend to grow. Refer to Plant Food Uptake Table.
  • Estimated fraction of total nitrogen in manure available in the year of application ( see Table 4 ).

Documentation filed in this section:

1. Calculate manure application rates for your fields based upon soil and manure test results and average crop yield.
Directions to Calculate Manure Application Rates
Complete one worksheet per field each year manure is applied. Keep completed worksheets as a record of the manure applied to each field.

2 . Calculate your need for supplemental nitrogen based upon your soil and manure test results.
Direction to Calculate Supplemental Nitrogen Need
Complete one worksheet per field each year manure is applied. Keep completed worksheets as a record of the manure applied to each field.

3 . Record Keeping Forms . Good record keeping is a cornerstone to producing crops with the highest yield possible, as well as utilizing manure efficiently. Records of the Total Amount of Manure Applied
Record Keeping Forms
Click here to see an example of a comprehensive Excel spreadsheet that calculates the animal manure balance for a dairy.
 


Full Text of Step 5 from USU/NRCS CNMP Curriculum: 


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