Published online 11 April 2005
Published in Soil Sci Soc Am J 69:695-700 (2005)
DOI: 10.2136/sssaj2004.0096
© 2005 Soil Science Society of America
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Development of a Water-Extractable Phosphorus Test for Manure
An Interlaboratory Study
Ann M. Wolfa,*,
Peter J. A. Kleinmanb,
Andrew N. Sharpleyb and
Douglas B. Beeglec
a Agricultural Analytical Services Lab., The Pennsylvania State Univ., University Park, PA 16802
b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802
c Dept. of Crop and Soil Sciences, The Pennsylvania State Univ., University Park, PA 16802

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Fig. 1. Relationship between ICP and colorimetric P measurements in WEP extracts.
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Fig. 2. Interlaboratory comparison of WEP results.
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Copyright © 2005 by the Soil Science Society of America.