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Received June 18, 2001,Revised June 18, 2001, Accepted , Available online

Volume 14,2002,Pages 413-417

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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.

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