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Cotton Defoliant Runoff as a Function of Active Ingredient and Tillage

^a USDA-ARS, Southeast Watershed Res. Lab., Box 946, Tifton, GA 31793
^b Crop and Soil Science Dep., Univ. of Georgia, Coastal Plain Exp. Stn., Tifton, GA 31793

View larger version (14K): [in a new window]   Fig. 1. Structures of defoliant active ingredients: (a) tribufos, (b) thidiazuron, and (c) dimethipin.

View larger version (45K): [in a new window]   Fig. 2. Topographic map of study site.

View larger version (26K): [in a new window]   Fig. 3. Infiltration and runoff hydrographs on ST and CT plots.

View larger version (21K): [in a new window]   Fig. 4. Change in total concentration with time during runoff.

View larger version (25K): [in a new window]   Fig. 5. Defoliant sediment-water partition coefficients (kd) in runoff collected at the edge of ST and CT.

View larger version (24K): [in a new window]   Fig. 6. Percent of defoliant applied in runoff.