화본과 잡초를 방제하기 위하여 사용되고 있는 제초제 quizalofop-ethyl의 토양중에서 잔류소장과 토양미생물상에 미치는 영향을 구명하기 위하여 전남농촌진흥원 시험포장 토양인 연곡식양토와 제주도 화산회 토양인 남원통에서 시험을 수행한 결과 토양중에서 제초제 quizalofop-ethyl의 반감기는 연곡통 15일, 남원통 16일이었으며, Baocteria, Actinomycetes, fungi, Pseudomonas는 quizalofop-ethyl에 의해 영향을 받아, 그 수가 현저하게 감소되었으나 Fusarium의 수는 큰 변화가 없었으며, 액체 배양에서 Fusarim을 접종한 배지에서는 quizalofop-ethyl의 량이 감소가 없는 것으로 보아 토양중에서 quizalofop-ethyl의 분해는 Fusarium에 의한 것으로 여겨졌다.
This study was conducted to find out the residual aspect and the effect of quizalofop-ethyl on microorganisms used to control broad-leaf weeds at Yeongok soil series, the experiment field, Chonnam R.D.A. and Namwon soil series, the experiment field, Jeju R.D.A. More than 60 percent of quizalofop-ethyl treated in soil was degraded within 7 days. The degradation of quizalofop-ethyl in soil increased rapidly with incubation temperature. The half-life of quizalofop-ethyl in soil was 15 days(Yeongok series) and 16 days(Namwon series). The number of microorganisms in soil treated with quizalofop-ethyl decreased prominently with incubation time. But the number of Fusarium did not reduce in comparison with that of other soil microorganisms. Therefore, it was thought that the decomposition of quizalofop-ethyl in soil was affected by $Fusarium^2$.
