Effect Of Safener AU2 On The Detoxification Of Chlorimuron-ethyl

The paper studied the effect of the residue of chlorimuron-ethyl in soil to susceptible crops and the effect of the herbicide safener AU2 on the detoxification of chlorimuron-ethyl by bioassy and field test. The effect of the herbicide safener AU2 and chlorimuron-ethyl on root activity, chlorophyl content, and glutathione (GSH) content and glutathione S-transferases (GSTs) activity in crops were examined.The results of the study as follow:1. The residue of chlorimuron-ethyl in soil and its effect to susceptible crops.The half life of chlorimuron-ethyl was 25 to 30 days. Degradation was fast in priliminary time and slow in afterward time. Cucumber, beet, carrot, rice and maize were susceptive to chlorimuron-ethyl residue in soil. Chlorimuron-ethyl concentration more than 3 u g/kg would injure cucumber, rice, beet and carrot. Chlorimuron-ethyl concentration more than 7 u g/kg would injure maize.2. The effect of AU2 on detoxification chlorimuron-ethyl. Soaking crop seeds with AU2 in 50mg/kg concentration had the best effect to protect susceptible crop from chlorimuron-ethyl injure. AU2 provided complete protection against chlorimuron-ethyl injure to cucumber, rice and relieve the injure to beet and carrot when concentration less than 3 U g/kg. AU2 could relieve the injure to cucumber, rice and relieve the injure to beet and carrot when concentration less than 7 u g/kg.3. The effect of AU2 and chlorimuron-ethyl on crops biochemistry index.AU2 could improve root activity and chlorophyl content in crops. AU2 and chlorimuron-ethyl had effect on glutathione content and glutathione S-transferases activity. The glutathione content and glutathione S-transferases activity was increased and then decreased with the concentration of chlorimuron-ethyl increased. AU2 could hold high glutathione content and glutathione S-transferases activity in crops with the concentration of chlorimuron-ethyl increased.