定虫隆在大白菜上的残留研究

THE DEGRADATION AND RESIDUE OF CHLORFLUAZURON IN CHINESE CABBAGE

1988、1989年在北京和四川两地对定虫隆在大白菜和土壤中的消解与残留进行了研究。结果表明,定虫隆在大白菜中的消解较快,半衰期为4—6天,但在土壤中消解缓慢,半衰期为69—186天。按推荐剂量和次数施药,大白菜最终残留量均低于最大残留限量(MRL)0.5ppm。

The degradation and residue of chlorfluazuron in Chinese cabbageand soil were studied at Beijing and Sichuan for two years.The resultsshowed that the degradation of chlorfluazuron in Chinese cabbage wasrapid and its half lives were 4-6 days,but the degradation in soilwas slow,the half lives were 69-186 days.According to the recom-mended dosage and times of application,its terminal residues in cabbagewere lower than maximum residue limit(0.5ppm).