CAFOs are usually large animal feeding operations, e.g. 1000 head of finishing beef or larger, but some medium-sized operations also are classified as CAFOs.
The Phosphorus Index should be used to assess the potential for phosphorus loss in runoff. The P index assessment for a field can be made any time, including after January 1, as long as it’s before any manure is applied to that field in 2007 or later. The results of the P index assessment need to be kept on file and the assessment needs to be repeated every five years.
Two P indexes are approved for Nebraska. An earlier index is available from the Nebraska NRCS Web site. A more recent P index and user guide (The Nebraska Phosphorus Index (2005): Background and Users Guide) are available online at UNL's Comprehensive Nutrient Management Planning Web site. The P indexes are not difficult to learn, and UNL Extension has conducted and will be conducting training on using the P index. NRCS field staff and some independent consultants also have been trained in using the P indexes.
Charles Wortmann
Extension Nutrient Management Specialist
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