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Herbicide Banding and Tillage System Interactions on Runoff Losses of Alachlor and Cyanazine

^a WCROC, Univ. of Minnesota, St. Hwy. 329, Morris, MN, 56267
^b Dep. of Soil, Water, and Climate, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
^c U.S. Geological Survey, Dep. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455-0116
^d USDA-ARS North Central Soil Conservation Research Lab, 803 Iowa Ave., Morris, MN 56267

View larger version (24K): [in a new window]   Fig. 1. Water-phase concentrations of alachlor (upper graph) and cyanazine (lower graph) for broadcast and band-applied herbicide methods as a function of cumulative precipitation. Data are from 1996 and 1997 study years and include three tillage practices.

View larger version (21K): [in a new window]   Fig. 2. The relationship of herbicide concentration in sediment versus runoff water for alachlor and cyanazine. The slope of this line is an estimate of the distribution coefficient of these herbicides in sediment eroded from a Clarion silt loam soil.

View larger version (26K): [in a new window]   Fig. 3. The effects of tillage practice and herbicide application method on alachlor losses in runoff (water + sediment) during 1996 and 1997. Error bars represent one standard deviation.

View larger version (25K): [in a new window]   Fig. 4. The effects of tillage practice and herbicide application method on cyanazine losses in runoff (water + sediment) during 1996 and 1997. Error bars represent one standard deviation.

View larger version (22K): [in a new window]   Fig. 5. The interaction of tillage practice and depth on the residual concentrations of cyanazine in the herbicide-treated band and the corresponding area for the broadcast-treated plot. The unique distribution of cyanazine in the ridge till treatment is due to mechanical soil movement that occurred during the ridge-building cultivation.