乙氧氟草醚在水稻及其生态环境中的残留降解动态

乙氧氟草醚在水稻及其生态环境中的残留降解动态楼小华，梁天锡，吴园生，平霄飞（中国水稻研究所杭州３１０００６）关键词乙氧氟草醚，残留降解，最终残留ＤｅｇｒａｄａｔｉｏｎＤｙｎａｍｉｃｓｏｆＯｘｙｆｌｕｏｒｆｅｎｉｎＲｉｃｅａｎｄＩｔｓＥｃｏｓｙｓｔｅｍ...

Degradation Dynamics of Oxyfluorfen in Rice and Its Ecosystem

The degradation dynamics and terminal residue trials of oxyfluorfen(20% AC) on rice and its ecosystem were carried out in Zhejiang and Guizhou Province. The tesults showed that this herbicide was swiftly decomposed in rice plant and paddy water. The degradation half life in the two sites were 2.1 days. 1.6 days for rice plant, and 1.0 day, 2.5 days for paddy water, respectively. In contrast, paddy soil showed a remarkable difference in the degradation behavior, with a half life of 9.1 days in Zhejiang and 36.1 days in Guizhou. When sprayed at rate of 150-240 g(ai) / ha, 7 days after transplanting, no oxyfluorfen residues were detected in harvested rice grain, plant, soil and water. Thus,utilization of oxyfluorfen in paddy field would cause little residue concerns.