灭多威在油菜和土壤中残留与降解的动态研究

Studv of Residue and Degradationof Methomyl in Rapes and Soils

本文进行了灭多威在油菜而上壤中残留与降解的动态研究。按推荐量施药，灭多威在油菜和土壤中降解较迅速，降解半衰期分别为５．５４天和５．ｏ４天，施药后１５天，灭多威在油菜和上壤中的降解率分别钩９５．６％和９７．７％。按不同浓度施药，灭多威在油菜和土壤中的残留量与施药量是正相关。本文还以降解速度、残留量，并参考国外残留标准，评价了灭多威对蔬菜、土壤的污染程度。结果表明，按推荐量施药，灭多威对蔬菜。

Residue and degradation of rnethomyl in rapes andsoils were studied.Applying at recommended rates,methornylwas degraded rapidly. The half-lives of degradation in rapesand soils were 5.54 days and 5.04 days respectively. In 15days, he degraded rates of methomyl in rapes and soils were95.6%and 97.7%respectively. Residues of rnethorrJyl wereincreased with increasing of the amount of used methomyl.The degree of methomyl pollution was evaluated with thespeed of degradation,residues and U.S.tolerances ofmethomyl in vegetables.