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Assessing Site Vulnerability to Phosphorus Loss in an Agricultural Watershed

USDA-ARS, Pasture Systems and Watershed Management Research Laboratory, Building 3702, Curtin Road, University Park, PA 16802-3702

View larger version (62K): [in a new window]   Fig. 1. The FD-36 watershed, soil type distribution, and field boundaries.

View larger version (23K): [in a new window]   Fig. 2. The FD-36 field boundaries and identification numbers.

View larger version (28K): [in a new window]   Fig. 3. Plan of the portable rainfall simulator, showing paired 1- by 2-m surface runoff plots, and water collection system. The nozzle is situated approximately 245 cm above the plots.

View larger version (28K): [in a new window]   Fig. 4. Relationship between the concentration of dissolved and total P in surface runoff and Mehlich-3 extractable soil P concentration for sites in fields where no P had been applied within the last six months and where fertilizer or manure had been applied within three weeks of rainfall in FD-36 watershed. Regression equations and corresponding coefficients apply only to plots not having received P in the last six months.

View larger version (27K): [in a new window]   Fig. 5. Relationship between the concentration of dissolved and total P in surface runoff and the P index rating for sites in fields where no P had been applied within the last six months and where fertilizer or manure had been applied within three weeks of rainfall in FD-36 watershed.

View larger version (28K): [in a new window]   Fig. 6. Relationship between the loss of dissolved and total P in surface runoff and the P index rating for sites in fields where no P had been applied within the last six months and where fertilizer or manure had been applied within three weeks of rainfall in FD-36 watershed.