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Phosphorus Budgets and Riverine Phosphorus Export in Northwestern Ohio Watersheds

Water Quality Laboratory, Heidelberg College, Tiffin, OH 44883

View larger version (63K): [in a new window]   Fig. 1. Locations of the study watersheds in the Lake Erie basin.

View larger version (41K): [in a new window]   Fig. 2. Phosphorus inputs and outputs from the soil compartment of agricultural watersheds.

View larger version (31K): [in a new window]   Fig. 3. Annual P inputs from fertilizer, manure, and sludge for the Maumee and Sandusky watersheds, 1975–1995.

View larger version (38K): [in a new window]   Fig. 4. Annual P outputs from corn, soybean, wheat, and hay for the Maumee and Sandusky watersheds, 1975–1995. (Same legend for both graphs.)

View larger version (80K): [in a new window]   Fig. 5. Annual point-source and nonpoint-source exports of P for the Maumee and Sandusky watersheds, 1975–1995.

View larger version (76K): [in a new window]   Fig. 6. Annual export of total phosphorus (TP), soluble reactive phosphorus (SRP), and particulate + soluble nonreactive phosphorus (TP - SRP) for the Maumee and Sandusky watersheds, 1975–1995.

View larger version (36K): [in a new window]   Fig. 7. Annual inputs, outputs, and net accumulation of P for the Maumee and Sandusky watersheds, 1975–1995.

View larger version (38K): [in a new window]   Fig. 8. Soluble reactive phosphorus (SRP) concentrations and stream flow for samples collected during successive winters (January, February, and March) in the Sandusky River, 1975–1992.