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Published online 2 February 2006
Published in J Environ Qual 35:404-411 (2006)
DOI: 10.2134/jeq2005.0045
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Reducing Crude Protein in Beef Cattle Diet Reduces Ammonia Emissions from Artificial Feedyard Surfaces

Richard W. Todd*, N. Andy Cole and R. Nolan Clark

USDA-ARS Conservation and Production Research Laboratory, P.O. Drawer 10, Bushland, TX 79012


Figure 1
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  		Fig. 1. The NH4–N concentration of analyte from gas washing bottles over artificial feedyard surfaces treated with manure from steers fed either 11.5 or 13.0% crude protein (CP) diet; summer trial, first day after treatment (DAT 1), 1300–1600 h.

 

Figure 2
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  		Fig. 2. Horizontal ammonia flux over artificial feedyard surfaces treated with manure from steers fed either 11.5 or 13.0% crude protein (CP) diet; summer trial, first day after treatment (DAT 1), 1300–1600 h.

 

Figure 3
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  		Fig. 3. Mean daily ammonia flux density from artificial feedyard surfaces treated with manure from steers fed either 11.5 or 13.0% crude protein (CP) diet. The summer trial began on 22 July 2002; autumn trial on 21 Oct 2002; winter trial on 10 Feb 2003; and spring trial on 14 Apr 2003.

 

Figure 4
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  		Fig. 4. Cumulative measured NH3–N emitted from artificial feedyard surfaces treated with manure from steers fed either 11.5 or 13.0% crude protein (CP) diet. The summer trial began on 22 July 2002; autumn trial on 21 Oct 2002; winter trial on 10 Feb 2003; and spring trial on 14 Apr 2003.

 




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