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Phosphorus Leaching at Cold Temperatures as Affected by Wastewater Application and Soil Phosphorus Levels

^a Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583
^b Department of Soil, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108

View larger version (21K): [in a new window]   Fig. 1. Linear P sorption isotherm of the (a) low-P soil and (b) high-P soil (N = 3). ***Significant at the 0.001 probability level. Curvilinear lines are fitted Langmuir isotherms through all data points.

View larger version (17K): [in a new window]   Fig. 2. Desorption of P from low- and high-P soils at various combinations of equilibration time and liquid to solid ratios (N = 3). Error bars represent standard error of the mean.

View larger version (31K): [in a new window]   Fig. 3. (a) Total phosphorus (TP) and (b) dissolved reactive phosphorus (DRP) leaching from high-P soil following application of single-stage treated potato processing wastewater at 4 ± 2 and 10 ± 2°C (N = 2). C0, input concentration; C, output or leachate concentration.

View larger version (28K): [in a new window]   Fig. 4. Total phosphorus (TP) and dissolved reactive phosphorus (DRP) leaching from high-P soil on application of two-stage treated potato processing wastewater at 4 ± 2°C (N = 3). C0, input concentration; C, output or leachate concentration.

View larger version (30K): [in a new window]   Fig. 5. Total phosphorus (TP), dissolved reactive phosphorus (DRP), dissolved unreactive phosphorus (DUP), total dissolved phosphorus (TOTDP), and total particulate phosphorus (TPP) leaching from high-P soil on application of (a) Br-spiked deionized water and (b) two-stage treated potato processing wastewater at 4 ± 2°C (N = 3). Note that P concentration is not presented as C/C0. Bromide breakthrough curves (BTCs) were not run with these columns.