The Effect of Isoproturon on Herbicidal Properties, Crop Injury and Yield in Barley and Wheat Cultivation

맥작(麥作)에 있어서 Isoproturon의 살초특성(殺草特性)과 약해(藥害) 및 수량(收量)에 미치는 영향(影響)

To investigate the effect of isoproturon (N,N-dimethyl-N-4-isopropyl phenyl urea) on weed-killing, crop injury and yield of barley, several experiments were conducted by application time, dosage, cultivars and soil texture. For the effective control of weeds the optimum application time was foliage application after winter. Alopecurus aequalis SOBOL was effectively controlled when isoproturon should be applied at three to four leaf-stage and most annual broad-leave weeds emerged through winter and spring could be controlled when applied even at five to six leaf-stage. But among the broad-leave weeds Vicia amoena Fisch. was resistant to isoproturn. The optimum application rate of isoproturon was 240g-300g/10a (prod.). Among 11 cultivars of barley and wheat, phytotoxicity of Olmil, Jokwang and Rye was slighter than that of the other cultivars when isoproturon was treated by foliage application after winter. At the time of foliage application after winter, the variation of phytotoxicity and effectiveness was a little despite the difference of soil texture and the grain yield of barley was higher in the plots treated 240-300g/10a than in other treated plots.

Isoproturon(N, N-dimethyl-N-4-isopropyl phenyl urea)의 효과적(効果的)인 사용방법(使用方法)을 구명(究明)하기 위하여 처리시기별(處理時期別), 약량별(藥量別), 품종별(品種別), 토성차이(土性差異) 등에 따른 약해(藥害) 및 제초효과변동(除草效果變動)과 수량(收量)에 끼치는 영향(影響)을 조사(調査)하였던 바 다음과 같은 결과(結果)를 얻었다. 1. 최적처리시기(最適處理時期)는 월동후(越冬後) 경엽처리(莖葉處理)로써 독새폴은 3~4 엽기(葉期)가 보다 효과적(效果的)이며 그 후처리(後處理)는 다소(多少) 효과(効果)가 감소(減少)되었다. 그러나, 동계(冬季) 및 춘계발생(春季發生) 광엽잡초(廣葉雜草)에 대해서는 5~6 엽기(葉期)까지도 유효(有効)하였으며 갈퀴 덩쿨은 저항성초종(抵抗性草種)이었다. 2. 최적처리약량(最適處理藥量)은 240g~300g/10a 수준(水準)이었다. 3. 경엽처리(莖葉處理)에 의 한 맥류품종문(麥類品種問)의 내약성(耐藥性) 차이(差異)를 보면 공시(供試)한 11 품종(品種) 중(中) 소맥(小麥)(율밀, 조광(早光))과 호맥(胡麥)에서 보다 안전성(安全性)이 높았다. 4. 월동후(越冬後) 경엽처리시(莖葉處理時)에는 토성(土性)의 차이(差異)에 따른 약해(藥害) 및 약효변동(藥效變動)이 적고 시용약량(施用藥量)의 폭(幅)이 비교적(比較的) 넓었다. 5. 보리 수량(收量)에 있어서는 월동후(越冬後) 경엽처리시(莖葉處理時) 240~300g/10a 처리구(處理區)에서 다른 처리구(處理區)보다 더 높았다.