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A review of two mandatory and two voluntary nutrient management strategies is …
Biology Articles » Agriculture » Evaluating Livestock System Environmental Performance with Whole-Farm Nutrient Balance » Tables
Table 1. The nutrient management plan (NMP) must address the following nine elements to comply with the National Pollutant Discharge Elimination System (NPDES) permit requirements of the concentrated animal feeding operation (CAFO) regulations (USEPA, 2003).
Table 2. Summary of characteristics for the beef cattle feedlot used in case-study problem.
The farm participated in a survey of 33 farms from which data was collected for the purpose of estimating a whole-farm nutrient balance for each farm (Koelsch and Lesoing, 1999). To protect the identity of the farm, the case-study farm used in this discussion is shown on a site (Fig. 2) different from the farm's actual site but with a comparable land base and production potential.
Feeding program represents actual farm feeding program at the time of the survey and Option 1 represents a standard feeding program option without the corn gluten feed designed to provide similar energy and protein levels. Purchased feeds are for year in which corn is grown on dry quarter. Values are on a dry-matter basis.
Irrigation nitrate credit is not included.
¶ Monoammonium phosphate (11–52–0).
Table 3. Effect of alternative best management practices (BMPs) on whole-farm phosphorus balance for beef case-study farm.
Original farm balance is based on the farm characteristics described in Table 2 and Fig. 2.
These options assume the base feeding program (see Table 2) and modifications to crop nutrient management program to apply manure on an N basis (Balance 2) and addition of 30.5 m manure application setback (Balance 3), minimum requirements of the USEPA CAFO regulations.
This option assumes the same situation as Balance 3 (base feeding program, N-based NMP, and setback) plus the export of 50% of manure production to off-farm uses.
¶ This option assumes the same situation as Balance 3 (base feeding program, N-based NMP, and setback) plus the implementation of feeding program Option 1 (see Table 2).
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