Abstract: Some field experiments were taken on the degrading process of dichlorvos residing in bean vegetables (green soy bean, pea, cowpea) and soil.The results showed that when the 80% dichlorvos oil was used at rates of 500~2 000 times, the degradation rate of dichlorvos was higher than 93%.3 d after sprayed, the degradation rate was over 99%, and the residue content was tested less than 0.02 mg/kg.5 d after sprayed, its residue could not be tested out in any bean vegetable.The degradation of dichlorvos residing in soil for pea growing conform to the regulation of the classical power rate.DT₅₀ of dichlorvos was 4.3 d.

Key words: dichlorvos, bean vegetables, soil, residue, degradation

摘要： 对敌敌畏在毛豆、豌豆、豇豆等豆类蔬菜及在豌豆田土壤中的残留降解动态进行田间测定。结果表明,80%敌敌畏乳油500~2000倍液施用1 d后的降解率均达93%以上;3 d后残留量≤0.02 mg/kg,降解率均达99%以上;5 d后未能检测到残留(检出限<0.005 mg/kg)。敌敌畏农药在豌豆田土壤中的降解规律符合一级动力学关系,半衰期(DT₅₀)为4.3 d。

关键词: 敌敌畏, 豆类蔬菜, 土壤, 残留, 降解