References

1. USDA ERS. United States Department of Agriculture Eco nomic Research Service. www.ers.usda.gov/data/manure. (accessed June 2004).

2. Gollehon, N.; Caswell, M.; Ribaudo, M.; Kellogg, R.; Lander, C.; Letson, D. Confined Animal Production and Manure Nutrients; Agriculture Information Bulletin No. 771, Resource Economics Division, Economic Research Service, U.S. Department of Agriculture, 2001.

3. NRCS. USDA Natural Resources Conservation Service. CORE4 Conservation Practices Training Guide; 1999.

4. Beegle, D.B.; Kelling, K.A.; Schmitt, M.A. Nitrogen from Animal Manures. In Nitrogen in Agricultural Soils; American Society of Agronomy Monograph, American Society of Agronomy: Madison, WI, Vol. x, in press.

5. Munoz, G.R.; Kelling, K.A.; Powell, J.M.; Speth, P.E.

Comparison of estimates of first year dairy manure N availability or recovery using 15N and other techniques. J. Environ. Qual. 2004, 33, 719 727.

6. Ivensen, K.V.; Davis, J.G.; Vigil, M.F. Variability of Manure Nutrient Content and Impact on Manure Sampling Protocol; Agronomy Abstracts, American Society of Agronomy: Madison, Winconsin, 1997; 239.

7. Nowak, P.; Shepard, R.; Madison, F. Farmers and Manure Management: A Critical Analysis. In Animal Waste Utilization: Effective Use of Manure as a Soil Resource; Hatfield, J.L., Stewart, B.A., Eds.; Ann Arbor Press: Chelsea, Michigan, 1998; 1 32.

8. Meisinger, J.J.; Jokela, W.E. Ammonia Volatilization from Dairy and Poultry Manure. In Managing Nutrients and Pathogens from Animal Agriculture; Natural Resource, Agriculture, and Engineering Service (NRARS): Cooper ative Extension, 152 Riley Robb Hall, Ithaca, NY, 2000; 334 354.

9. Risse, L.M.; Cabrera, M.L.; Franzluebbers, A.J.; Gaskin, J.W.; Gilley, J.E.; Killorn, R.; Radcliffe, D.E.; Tollner, W.E.; Zhang, H. Land Application of Manure for Beneficial Reuse. In National Center for Animal Manure and Waste Management. Summary of White Papers; 2001. http://www.cals.ncsu.edu:8050/waste mgt/natlcenter/ summary.pdf (accessed June 2004).

10. Roos, K.F. Profitable Alternatives for Regulatory Impacts on Livestock Waste Management. In National Livestock, Poultry and Aquaculture Waste Management; Balke, J., Donald, J., Magette, W., Eds.; American Society of Agricultural Engineers: St. Joseph, Michigan, 1992; 89 99.

John A. Marchello Elaine V. Marchello

University of Arizona, Tucson, Arizona, U.S.A.

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