Occurrence Pattern and Control Method of Water - foxtail(Alopecurus aequalis Ohwi) in No - tillage Paddy

무경운답(無耕耘畓)에서 둑새풀의 발생양상(發生樣相)과 방제방법(防除方法)

In order to estabilish a labour-saved and environmental protected paddy rice system in Southern Korea, new system, called no-tillage paddy system, was proposed and investigated from 1988 to 1996. Under the no-tillage paddy system, occurrence pattern, control value and regrowth of water foxtail each treatment(herbicides and application dates), and occurrence of volunteer rice plant in application dates of herbicide were investigated. The growth of water-foxtil was markedly increased from middle of May and no. of tillers and dry weight of water-foxtail increased up to 3rd crop year in no-tillage. Glyphosate application for control of water-foxtail was 20 days before transplanting. And when the soil under the no-tillage paddy system in May 1 and May 10 application of herbicide machine-transplanted with 8-day-old seedlings missing hills were increased compared to April 20 and early growth stages of machine transplanted of rice in April 20 applications of herbicide showed increased plant height, no. of tillers of rice, occurrence of volunteer rice plants from the shattered seeds were 1,600plants/10a and decreased in May 10 compared to April 20 and May 1.

지속적 농업을 구현하는 차원에서 제안된 논 무경운체계에서 이앙전 발생한 둑새풀을 효과적으로 방제하기 위하여 제초제의 종류와 처리시기 및 처리약량을 달리하여 둑새풀 방제가, 재생정도 및 전년도 탈립된 벼의 발생정도를 조사한 결과는 다음과 같다. 1. 둑새풀은 4월중순부터 생육이 급격히 진전되었으며, 무경운 경관년수가 깊어질수록 그 발생량은 많아졌다. 2 둑새풀 방제를 위하여 Glyphosate를 이앙전 20일경에 살포하는 것이 적당하였다. 3. 벼 이앙시 결주율은 비선택성 제초제 처리시기가 늦을수록 높아졌으며, 이앙후 생육은 처리시가가 빠를수록 양호하였다. 4. 잡벼 발생은 비선택성 제초제를 살포하지 않을 경우 1,600개체/10a 정도 발생하였으며, 제초제 처리시기가 늦을수록 적게 발생하였다.