Effective Weed Control in Direct-Seeded Rice under Dry Fields

벼 건답직파(乾畓直播)에 있어서 효과적(效果的)인 잡초방제(雜草防除)

This experiment was conducted to evaluate effective weed control in direct-seeded rice under dry fields. The results obtained are as follows. Cyhalofop/bentazone EW and cyhalofop/pendimethalin EC were very effective for the weed control but cyhalofop/cinosulfuron WP and cyhalofop/azimsulfuron SC were tended to exhibit the lower weeding effect. The plant height and the tiller number of rice were not greatly affected by herbicides, but rice yield was greatly influenced by them. The control efficacy was observed the extend of 94% until 60days after seeding under the treatment of systematic herbicides such as foliar applied pendimethalin propanil EC at 15days after seeding mowed by pyrazosulfuron molinate GR at 5days after irrigation. Irrigation at 25days after seeding was able to control annual weeds by the extent of 25% and exhibited control effect of 94% on systematic treatment of herbicides compared with that of 35days after seeding.

벼 건답직파(乾畓直播)논에서 효과적(效果的)인 잡초방제(雜草防除)를 위한 경엽처리용(莖葉處理用) 제초제(除草劑)의 선발시험(選拔試驗)과 효과적(效果的)인 방제체계시험(防除體系試驗)을 실시(實施)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 경엽처리용(莖葉處理用) 제초제(除草劑)인 cyhalofop/bentazone EW와 cyhalofop/pendimethalin EC는 90% 이상(以上)의 방제효과(防除效果)를 보였다. 2. cyhalofop/bentazone EW 등 공시약제(供試藥劑) 모두 약해(藥害)는 발생(發生)치 않았으며 수확량(收穫量)은 cyhalofop/bentazone EW와 cyhalofop/pendimethalin EC는 10a당(當) 620kg 이상(以上)을 보였으나 cyhalofop/cinosulfuron WP와 cyhalofop/azimsulfuron은 10a당(當) 각각(各各) 510kg과 576kg으로 나타나 다소(多少) 차이(差異)를 보였다. 3. 제초제(除草劑) 체계처리효과(體系處理效果)에는 파종후(播種後) 15일(日)에 pendi pronil EC를 처리(處理)한 다음 담수후(湛水後) 5일(日)에 pyrazosufuron molinate GR를 체계처리(體系處理)한 구(區)에서 94%의 높은 잡초방제(雜草防除)를 보였다. 4. 담수시기별(湛水時期別) 잡초발생량(雜草發生量)은 파종후(播種後) 25일(日) 담수구(湛水區)는 파종후(播種後) 35일(日) 담수구(湛水區)에 비(比)해 일년생잡초(一年生雜草) 발생량(發生量)이 25% 적었고 방제효과(防除效果)도 94%로 높았다. 5. 담수시기(湛水時期)를 달리 하여 pendi pronil EC와 pyrazosulfuron molinate GR를 체계처리(體系處理)한 결과(結果) 파종후(播種後) 25일(日) 담수구(湛水區)는 94%의 높은 방제가(防除價)를 보였다.