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Estimating Runoff Phosphorus Losses from Calcareous Soils in the Minnesota River Basin

^a Graduate Program in Water Resources Science, 500 Pillsbury Dr. SE, Univ. of Minnesota, Minneapolis, MN 55455
^b Dep. of Civil Engineering and Water Resources Center, Univ. of Minnesota, St. Paul, MN 55108
^c Water Resources Center, 173 McNeal Hall, Univ. of Minnesota, St. Paul, MN 55108
^d Dep. of Soil, Water and Climate, Univ. of Minnesota, MN 55108

View larger version (26K): [in a new window]   Fig. 1. The Minnesota River basin, its major watersheds, and soil sampling sites for this study.

View larger version (25K): [in a new window]   Fig. 2. Schematic sketch of a runoff box (not to scale).

View larger version (26K): [in a new window]   Fig. 3. (a) Soil P sorption isotherms. (b) Langmuir model fitting of soil P sorption isotherms (all r2 > 0.97).

View larger version (28K): [in a new window]   Fig. 4. Soluble reactive phosphorus (SRP) in runoff vs. soil test P (STP) levels using (a) Mehlich-III, (b) Olsen, (c) NaOH, and (d) Bray extractants.

View larger version (26K): [in a new window]   Fig. 5. Soluble reactive P (SRP) in runoff vs. soil sorption capacity: (a) desorbability, (b) soil equilibrium phosphorus concentration (EPC), (c) phosphorus saturation index based on sorption maximum (PSIm), and (d) phosphorus saturation index based on sorptivity (PSIs).

View larger version (19K): [in a new window]   Fig. 6. The relationship between runoff particulate phosphorus (PP) and runoff total suspended sediment (TSS).