Rapid degradation of bensulfuron-methyl upon repeated application in paddy soils

Article type: Research Article

Authors: XIE, Xiao-mei | LIU, Wei-ping | ABID, Subhani

Affiliations: College of Environmental and Resource Sciences, Department of Resources Science, Zhejiang University, Hangzhou 310029, China | College of Environmental and Resource Sciences, Department of Environmental Science, Zhejiang University, Hangzhou 310029, China

Note: [] Corresponding author. E-mail: xiexiaomei686@yahoo.com.cn

Abstract: Rapid degradation of bensulfuron-methyl upon repeated application in paddy soils was studied. The results showed that the DT_{50} of bensulfuron-methyl was reduced from 16 d to 9 d in soil with one-year bensulfuron-methyl application. Rapid bensulfuron-methyl degradation was happened to previously untreated soil by addition 5% rapid bensuifuron-methyl adapted soil and was inhibited following pre-treatment with broad-spectrum antibiotic chloramphenicol. In bensulfuron-methyl adapted soil mineralisation of ^{14}C labeled bensulfuronmethyl to ^{14}CO_2 occurred at a faster rate than with previously untreated soil. It was concluded that rapid bensulfuron-methyl degradation upon repeated application is probably linked to the adaptation of soil bacteria which can utilize bensulfuron-methyl as a source of carbon and energy.

Keywords: bensulfuron-methyl, rapid degradation, paddy soil

Journal: Journal of Environmental Sciences, vol. 16, no. 1, pp. 49-52, 2004