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Use of Organosmectites to Reduce Leaching Losses of Acidic Herbicides

^a Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, P.O. Box 1052, 41080 Sevilla, Spain
^b USDA-ARS, Soil and Water Management research Unit, 1991 Upper Buford Cir. Rm 439, St. Paul, MN 55108

View larger version (17K): [in a new window]   Fig. 1. Extended-sorption isotherms of bentazone and dicamba on organoclays. Error bars are standard deviations.

View larger version (22K): [in a new window]   Fig. 2. Bentazone release kinetics in water from aged and nonaged complexes with 4% bentazone content. Error bars are standard deviations.

View larger version (20K): [in a new window]   Fig. 3. Dicamba release kinetics in water from aged and nonaged complexes with 4% dicamba content. Error bars are standard deviations.

View larger version (26K): [in a new window]   Fig. 4. (A) Bentazone, and (B) dicamba, concentrations in leachate after application to the soil column as free herbicide and herbicide–OCl complexes (aged, nonaged, and dry mixture). Error bars are standard deviations.

View larger version (33K): [in a new window]   Fig. 5. (A) Bentazone, and (B) dicamba, cumulative breakthrough curves after application to the soil column as free herbicide and herbicide–OCl complexes (aged, nonaged, and dry mixture). Error bars are standard deviations.