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Published online 7 November 2005
Published in J Environ Qual 34:2093-2103 (2005)
DOI: 10.2134/jeq2004.0410
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Dietary Strategies for Reduced Phosphorus Excretion and Improved Water Quality

R. O. Maguirea,*, Z. Doub, J. T. Simsc, J. Brakea and B. C. Joernd

a Department of Poultry Science, North Carolina State University, Raleigh, NC 27695
b School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348
c Department of Plant and Soil Science, University of Delaware, Newark, DE 19716
d Department of Agronomy, Purdue University, West Lafayette, IN 47907



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  		Fig. 1. Excess of manure phosphorus assuming no export of manure from farm (reproduced from Kellogg et al., 2000). For a color version, see www.nrcs.usda.gov/technical/land/lgif/m5438l.gif (verified 29 Mar. 2005).

 


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  		Fig. 2. Effect of total P concentration in dairy diets on the water-soluble phosphorus (WSP) to total P ratio in manures generated (adapted from Dou et al., 2002, 2003; Chapuis-Lardy et al., 2004).

 


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  		Fig. 3. Total litter ortho-P and phytate-P concentrations in poultry litters, identified by solution 31P nuclear magnetic resonance spectrometry. The legend defines litters considered high and low in dietary non-phytate phosphorus (NPP), with and without phytase (reproduced from Maguire et al., 2004).

 




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