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Published online 20 September 2006
Published in Soil Sci Soc Am J 70:1967-1974 (2006)
DOI: 10.2136/sssaj2006.0027
© 2006 Soil Science Society of America
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Estimating Dissolved Phosphorus Concentrations in Runoff from Three Physiographic Regions of Virginia

C. J. Penna,*, G. L. Mullinsb, L. W. Zelaznyc and A. N. Sharpleyd

a Dep. of Plant and Soil Sciences, Oklahoma State Univ., 367 Agricultural Hall, Stillwater, OK 74078
b Dep. of Plant and Environmental Sciences, New Mexico State Univ., Las Cruces, NM 88003
c Dep. of Crop, Soil, and Environmental Sciences, Virginia Tech, 330 Smyth Hall, Blacksburg, VA 24061
d USDA ARS, PSRMRU, 3702 Curtin Rd., State College, PA 16802


Figure 1
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  		Fig. 1. Relationship between average soil clay content and the y intercept for the soil WSP (water-soluble P) vs. runoff DRP (dissolved reactive P) relationship for each soil type.

 

Figure 2
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  		Fig. 2. Relationship between soil WSP (water-soluble P) and runoff DRP (dissolved reactive P) concentration for all soils as grouped by physiographic region. Lowercase letters in inset indicate statistical significance (P = 0.05) of slope and intercept among the physiographic region. Physiographic regions that possess the same letter are not significantly different from each other.

 




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