Behavior of Bromobutide in Paddy Water and Soil After Application

Behavior of the herbicide bromobutide, (RS)-2-bromo-N-(alpha,alpha-dimethylbenzyl)-3,3-dimethylbutyramide, in paddy water and soil after application to paddy fields was investigated to evaluate the degradation to bromobutide-debromo, N-(alpha,alpha-dimethylbenzyl)-3,3-dimethylbutyramide, and runoff of the herbicide. The respective maximum concentrations of bromobutide and the metabolite were 1,640-2,230 and 11.1-15.8 mu g/L in the paddy water, and 2,210-4,140 mu g/kg dry and 74-119 mu g/kg dry in the paddy soil, respectively. The runoff ratios of the applied bromobutide from the paddy fields were calculated as 28 +/- A 16%. The respective mean values of the half-lives of bromobutide in the paddy water and the soil were 2.7 +/- A 0.34 days and 6.9 +/- A 2.6 days, respectively.