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Effect of Mineral and Manure Phosphorus Sources on Runoff Phosphorus

USDA-Agricultural Research Service, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802-3702

View larger version (24K): [in a new window]   Fig. 1. Schematic diagram of runoff box used in this study including (a) overall dimensions, (b) drain holes in base of box, and (c) runoff collection gutter.

View larger version (36K): [in a new window]   Fig. 2. Mean runoff DRP concentrations following surface application of P sources to (a) Buchanan–Hartleton, (b) Hagerstown, and (c) Lewbeach soils. Letters above bars columns identify groupings of means that are not significant at p = 0.05, with lowercase denoting low-P soils and uppercase denoting high-P soils. Hypothesis tests were conducted on square root–transformed data.

View larger version (41K): [in a new window]   Fig. 3. Mean runoff total phosphorus (TP) concentrations following surface application of P sources to (a) Buchanan–Hartleton, (b) Hagerstown, and (c) Lewbeach soils. Letters above bars columns identify groupings of means that are not significant at p = 0.05, with lowercase denoting low-P soils and uppercase denoting high-P soils. Hypothesis tests were conducted on square root–transformed data.

View larger version (38K): [in a new window]   Fig. 4. Mean runoff total phosphorus (TP) concentrations following mixing of P sources with (a) Buchanan–Hartleton, (b) Hagerstown, and (c) Lewbeach soils. Letters above bars columns identify groupings of means that are not significant at p = 0.05, with lowercase denoting low-P soils and uppercase denoting high-P soils. Hypothesis tests were conducted on square root–transformed data.

View larger version (15K): [in a new window]   Fig. 5. Relationship of suspended solids (SS) and total phosphorus (TP) in runoff for surface-applied and mixed treatments.