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Effect of Mixing Soil Aggregates on the Phosphorus Concentration in Surface Waters

^a Dep. of Plant and Soil Sci., Univ. of Delaware, Newark, DE 19717-1303
^b Macaulay Land Use Research Inst., Craigiebuckler, Aberdeen, AB15 8QH, UK
^c USDA-ARS, Pasture Systems and Watershed Research Unit, Curtin Road, University Park, PA 16802-3702

View larger version (20K): [in a new window]   Fig. 1. Water-soluble phosphorus (WSP) release from pure G5 (2 to 52 µm) and G3 (151 to 2000 µm) with mixes of these aggregate size fractions at ratios of 1:3 and 3:1. Predicted versus measured WSP values are given, and the final percentage increase (FPI) is identified.

View larger version (22K): [in a new window]   Fig. 2. Relationship between the final percentage increase when two aggregates were mixed and (a) the numeric difference and (b) the proportional difference between their phosphorus buffer capacities (PBCs).