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Published online 31 May 2006
Published in J Environ Qual 35:1151-1159 (2006)
DOI: 10.2134/jeq2005.0332
© 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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Effect of Methodology in Estimating and Interpreting Water-Extractable Phosphorus in Animal Manures

P. A. Vadasa,* and P. J. A. Kleinmanb

a USDA-ARS, U.S. Dairy Forage Research Center, 1925 Linden Drive West, Madison, WI 53706
b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802-3702


Figure 1
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  		Fig. 1. Effect of extraction ratio on inorganic water-extractable phosphorus measured colorimetrically without digestion (WEPI) and total water-extractable phosphorus measured colorimetrically with digestion (WEPT) in two dairy manures, either (a and b) with or (c and d) without bedding, as analyzed fresh, air-dried, or oven-dried. Data are averages of single and sequential batch extractions.

 

Figure 2
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  		Fig. 2. Effect of extraction ratio on (a) inorganic water-extractable phosphorus measured colorimetrically without digestion (WEPI) and (b) total water-extractable phosphorus measured colorimetrically with digestion (WEPT) in swine manure as analyzed fresh, air-dried, or oven-dried. Data are averages of single and sequential batch extractions.

 

Figure 3
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  		Fig. 3. Effect of extraction ratio on inorganic water-extractable phosphorus measured colorimetrically without digestion (WEPI) and total water-extractable phosphorus measured colorimetrically with digestion (WEPT) in two poultry manures from (a and b) Pennsylvania or (c and d) Texas, both with sawdust–woodchip bedding and as analyzed fresh, air-dried, or oven-dried. Data are averages of single and sequential batch extractions.

 

Figure 4
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  		Fig. 4. Relationship between water-extractable phosphorus (WEP) applied to soil boxes in dairy, poultry, and swine manure and dissolved P measured in runoff from the same boxes shortly after manure application. Data are from Kleinman et al. (2002a) and represent manure WEP measured from two different groups of similar extraction ratios.

 




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