Effects of butachlor on microbial enzyme activities in paddy soil

Article type: Research Article

Authors: Min, Hang | Ye, Yang-fang | Chen, Zhong-yun | Wu, Wei-xiang | Du, Yu-feng

Affiliations: Department of Biology science,College of Life Science,Zhejiang University,Hangzhou 310029,China, E-mail:minhang @ hz.zj.cn

Abstract: This paper reports the influences of the herbicide butachlor ( n-butoxymethl-chloro-2 ',6 '-diethylacetnilide ) on microbial respiration,nitrogen fixation and nitrification,and on the activities of dehydrogenase and hydrogen peroxidase in paddy soil.The results showed that after application of butachlor with concentrations of 5.5 µg/g dried soil,11.0,µg/g dried soil and 22.0 µg/g dried soil,the application of butachlor enhanced the activity of dehydrogenase at increasing concentrations.The soil dehydrogenase showed the highest activity on the 16th day after application of 22.0 µg/g dried soil of butachlor.The hydrogen peroxidase could be stimulated by butachlor.The soil respiration was depressed within a period from several days to more than 20 days,depending on concentrations of butachlor applied.Both the nitrogen fixation and nitrification were stimulated in the beginning but reduced greatly afterwards in paddy soil.

Keywords: herbicide, butachlor, microbial enzyme activity, paddy rice soil

Journal: Journal of Environmental Sciences, vol. 14, no. 3, pp. 413-417, 2002