Land application of livestock manure can be a very cost-effective source of nutrients for crop producers as well as an efficient means of waste disposal for livestock producers. However, to get the most value from a manure application and minimize any potential off-site environmental impacts, it is important to follow the 4R’s of nutrient stewardship. This means using the right source, the right rate, at the right time, with the right placement. The development of a Comprehensive Nutrient Management Plan (CNMP) with the Natural Resources Conservation Service (NRCS) can be a very useful tool for livestock producers looking to responsibly land apply their manure.
The basic requirements of a CNMP are described in the NRCS Conservation Practice Standard 590. However, it is always best to check with your local NRCS office to determine any specific requirements for your area. Two of the key elements in developing a CNMP require laboratory analysis. First, the fields where the manure is to be applied must have current soil test data that is no older than three years. This will ensure that the nutrients are not being over applied. The second laboratory analysis is a nutrient analysis of the manure. This will ensure that the correct rate is being applied.
Laboratory analysis of manure for CNMP’s must include, at a minimum, total nitrogen, ammonium nitrogen, total phosphorus, and total potassium. The benefit in using an analysis package that include ammonium nitrogen is that the estimation of first year available nitrogen is much more accurate as compared to a calculated value based on total nitrogen alone. The analysis package available at A&L Great Lakes Laboratories that provides the minimum requirement for CNMP’s is the M4. For a complete listing of manure analysis packages, please visit our website and navigate to manure analysis under services.