Sulfentrazone dissipation in a Tennessee soil

Sulfentrazone dissipation in soil was examined in field experiments in 1995 , 1996, and 1997 at Knoxville, TN, on a Sequatchie loam soil. Sulfentrazone 50% disappearance time (DT50) varied from 24 to 113 d. Cotton injury was o bserved the year following sulfentrazone application when half-lives were g reater than or equal to 85 d. Sulfentrazone degradation under controlled la boratory conditions was slower in autoclaved soil than in nonautoclaved sur face soil and subsurface soil, with DT50 of 198, 93, and 102 d, respectivel y. The difference due to autoclaving the soil implied that sulfentrazone de gradation was influenced by both microbial and chemical mechanisms.