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Phosphorus Loss and Runoff Characteristics in Three Adjacent Agricultural Watersheds with Claypan Soils

^a Center for Agroforestry, School of Natural Resources, University of Missouri, Columbia, MO 65211
^b Department of Soil, Environmental and Atmospheric Sciences, School of Natural Resources, University of Missouri, Columbia, MO 65211

View larger version (39K): [in a new window]   Fig. 1. Study site location in Missouri and 0.5-m interval contour lines on east, center, and west watersheds. Gray bands indicate location of the grass waterways.

View larger version (41K): [in a new window]   Fig. 2. Monthly precipitation distribution, crop type, and planting dates at the Greenley Center from 1991 to 1997. The line represents the long-term monthly mean precipitation from 1961 to 1990. The gray areas represent cropping periods.

View larger version (44K): [in a new window]   Fig. 3. Annual total phosphorus loss for the east, center, and west watersheds and the mean annual and fallow period total phosphorus losses across all watersheds from 1991 to 1997. Bars indicate ±1 standard deviation for the mean annual and fallow period total phosphorus losses across all watersheds.

View larger version (27K): [in a new window]   Fig. 4. Relationships between runoff volume and total phosphorus loss for (A) east, (B) center, and (C) west watersheds. *** Significant at the 0.001 probability level.

View larger version (35K): [in a new window]   Fig. 5. Total phosphorus concentration and its frequency for the east, center, and west watersheds from 1991 to 1997.

View larger version (24K): [in a new window]   Fig. 6. Relationships between sediment loss and total phosphorus loss for (A) east, (B) center, (C) west watersheds, and (D) all three combined. *** Significant at the 0.001 probability level.