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Published online 9 August 2005
Published in J Environ Qual 34:1640-1650 (2005)
DOI: 10.2134/jeq2004.0480
© 2005 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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Soil Characteristics and Phosphorus Level Effect on Phosphorus Loss in Runoff

Randall L. Davisa, Hailin Zhangb,*, Jackie Lee Schroderb, Jim J. Wangd, Mark E. Paytonc and Anne Zazulake

a Apex Environmental Inc., Lenexa, KS 66215
b Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
c Department of Statistics, Oklahoma State University, Stillwater, OK 74078
d Department of Agronomy and Environmental Management, Louisiana State University, Baton Rouge, LA 70803
e STV Incorporated, 80 Ferry Boulevard, Stratford, CT 06615



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  		Fig. 1. Changes in Mehlich-3 P over 360 d for four fertilizer phosphorus treatments for the Kirkland soil series.

 


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  		Fig. 2. The relationships between Mehlich-3 P and P added for (A) three individual study soils and (B) all soils combined. ***Significant at the 0.001 probability level.

 


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  		Fig. 3. The relationships between runoff dissolved reactive P and (A) Mehlich-3 P and (B) water-soluble P for the three study soils. ***Significant at the 0.001 probability level.

 


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  		Fig. 4. The relationships between runoff dissolved reactive P and (A) phosphorus saturation index calculated with acid ammonium oxalate–extractable data (PSIox), (B) a phosphorus saturation index calculated with Mehlich-3 P and Smax (Psat), and (C) a phosphorus saturation index calculated with water-soluble P and Smax (PSIWSP) for the three study soils. ***Significant at the 0.001 probability level.

 


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  		Fig. 5. The relationships between phosphorus load and (A) Mehlich-3 P and (B) water-soluble P for the three study soils. ***Significant at the 0.001 probability level.

 




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