Degradation Effect of Degrading Bacterium N80 on Chlorimuron-ethyl in Soil

doi:10.11924/j.issn.1000-6850.casb15040055

Abstract

Abstract: N80 was taken as the tested strain to study the degradation effect on chlorimuron-ethyl in meadow chernozemic soil. The effects of inoculum size of N80, initial dosage of the substrate chlorimuron-ethyl, soil moisture and types on the degradation of chlorimuron-ethyl were studied. The results showed that chlorimuronethyl degradation rate increased from 32.5% to 87.7% when the substrate concentration was 20 mg/kg and N80 5 × 1014 CFU/g was added into the sterilized meadow chernozemic soil. In contrast, chlorimuron- ethyl degradation rate increased from 47.5% to 94.4% in the non-sterilized soil when N80 was added. Meanwhile, the chlorimuron- ethyl degradation rates were 49% and 87.5% respectively in brown soil and meadow chernozemic soil after N80 was inoculated for 30 days. When the substrate chlorimuron-ethyl was 20 mg/kg with N80 inoculum size of 5×1014 CFU/g and soil moisture content of 30%, N80 had the best degradation effect on chlorimuron-ethyl herbicide in meadow chernozemic soil.

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