Degradation Behavior of Azoxystrobin Residue in Water and Soil in Paddy Field and Rice Plant

Through field experiments,which were conducted in Changsha City of Hunan Province,Hangzhou City of Zhejiang Province and Nanning City of Guangxi Province,the degradation dynamics of Azoxystrobin in water and soil in paddy field and rice plant were studied.The results showed that the Azoxystrobin residue was determined by GC,the minimum detectable quantity for paddy field water,paddy field soil and rice plant was 0.02,0.02 and 0.08 mg/kg,respectively,the fortified recovery rate was from 77.46% to 119.96%,and the relative standard deviation was from 1.16% to 9.27%.The degradation kinetic equation showed that the average half-life of Azoxystrobin in paddy field water,paddy field soil and rice plant was 6.04 d,8.58 d and 6.21 d,respectively.Therefore,the Azoxystrobin is a pesticide degrades easily.