Dissipation of Chlorimuron in Southern Soils

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Abstract
Chlorimuron dissipation as determined by bioavailability in nine soils across the Southern United States was characterized by rapid initial loss followed by a slower dissipation rate following field application of the herbicide in soybean. The rate of bioavailable dissipation varied by year and soil The calculated time for 50% dissipation of bioavailable chlorimuron (DT50) ranged from 5 to 18 d in 1988, 5 to 20 d in 1989, and 5 to 11 d in 1990. In 2 of 3 yr, chlorimuron DT50was positively correlated with temperature 24 h after application. Chlorimuron DT50was positively correlated with precipitation in 1988 when regional rainfall was below normal and negatively correlated with precipitation 30 d after application in 1989 when regional rainfall was above normal.