异丙隆在土壤和小麦中的降解与残留

Study on degradation and residue of isoproturon in the soils and wheat

在扬州和聊城两地进行了除草剂异丙隆在小麦上和麦田土壤中的残留动态和最终残留量试验，结果表明，异丙隆在小麦植株和土壤中消解较快，消解半衰期分别为３～４ｄ和８～１４ｄ；收获时小麦籽粒中异丙隆残留量小于０．０４ｍｇ／ｋｇ。推荐暂定异丙隆在小麦上ＭＲＩＬ值为０．５ｍｇ／ｋｇ。２５％异丙隆可湿性粉剂，按７．５ｋｇ／ｈｍ￣２用量，在次年早春（２月）使用，籽粒中异丙隆最终残留量不会超过ＭＲＬ值，对小麦是安全的。

Residue and degradation characteristic of isoproturon in the wheat and wheat field soils were studied for ayear at two places. The results of experiments showed that isoproturon was degraded fast in the wheat plants and soils,the halflife of isoproturon was 3～4 days in the wheat plants,and 8～14 days in the field soils.The residue levels in thewheat seeds were lower than 0.04 mg/kg by the wheat harvest,and below MRL that is suggested 0.5mg/kg,when25% isoproturon was applied to the wheat fields at 7.5 kg/hm￣2 in next February.