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Soil Phosphorus, Management Practices, and Their Relationship to Phosphorus Delivery in the Iowa Clear Lake Agricultural Watershed

^a Department of Agronomy, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011
^b Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011

View larger version (54K): [in a new window]   Fig. 1. Soil sample points, water sample sites, and basin identification for the Clear Lake agricultural watershed survey study.

View larger version (18K): [in a new window]   Fig. 2. Relationship between mean total P concentration in water discharge (August 1999–July 2000) and mean soil-test phosphorus (STP) measured with five soil P tests for five basins of the Clear Lake agricultural watershed.

View larger version (18K): [in a new window]   Fig. 3. Relationship between mean total P concentration in water discharge measured during 15 storm flow events and mean soil-test phosphorus (STP) measured with five soil P tests for five basins of the Clear Lake agricultural watershed.