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Using the Mehlich-1 Extract to Estimate Soil Phosphorus Saturation for Environmental Risk Assessment

Dep. of Crop, Soil and Environmental Sciences, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061-0404

View larger version (28K): [in a new window]   Fig. 1. (a) Degree of P saturation (DPS, Eq. [2]) as a function of Mehlich-1 extractable P for soils of three major physiographic regions of Virginia. *** denotes significant at 0.001 probability level. (b) Log scale plot of DPS (Eq. [2]) as a function of Mehlich-1 extractable P for soils of three major physiographic regions of Virginia.

View larger version (16K): [in a new window]   Fig. 2. Remaining P sorption capacity (Fr) as a function of Mehlich-1 extractable P for soils of three major physiographic regions of Virginia. ***Denotes significant at 0.001 probability level.

View larger version (16K): [in a new window]   Fig. 3. Remaining P sorption capacity (Fr) as a function of degree of P saturation (DPS) for soils of three major physiographic regions of Virginia. ***Denotes significant at 0.001 probability level.

View larger version (11K): [in a new window]   Fig. 4. Relationship of effective degree of P saturation (DPS) calculated with empirically determined m versus the use of 0.50 as a constant for m.

View larger version (11K): [in a new window]   Fig. 5. Relationship of effective degree of P saturation (DPS) calculated with empirically determined m versus DPS defined as .