벼 건답직파 잡초방제 확립 (Weed Control in Dry Direct-Seeded Rice)

서지정보

· 발행기관 : 한국잡초학회
· 수록지 정보 : Weed&Turfgrass Science / 23권 / 3호 / 221 ~ 229페이지
· 저자명 : 문병철, 성기영, 박재읍, 이인용, 구연충

초록

'96년까지 확립된 건답직파재배시 잡초방제 체계는 특히 피방제를 완전하게 하지 못할뿐더러 새롭게 문제로 대두된 잡초들을 효과적으로 방제하지 못하는 점들이 있어 '96년부터 '98년까지 3년간 보완 시험한 결과를 보면 다음과 같다.1. 파종후 20-25일경 피4-5엽기에 cyhalofop- butyl·bentazone, cyhalofop-butyl·pendimethalin 및 pyribenzoxim의 경엽처리시 피 등 잡초방제가 효과적이었다.2. cyhalofop-butyl·pendimethalin의 처리는 피 7-8엽기까지 95% 이상 방제가 가능하며, 피 종별로는 물피에 비해 강피의 내성이 강하므로 7-8엽기의 강피를 95% 이상 방제하려면 1.5배량 증량이 요구되었다.3. 파종후 40-50일경 (담수후 10-20일경)인 피 7-8엽기 이후에 cyhalofop-butyl·bentazone, pyribenzoxim, fenoxaprop-P-ethyl·bentazone을 1.5배량 처리시 90% 이상 잡초 방제효과가 있었다. pyribenzoxim 처리의 경우 담수후 50일 처리에서도 96%의 잡초방제 효과를 보였다.4. 파종후 5일에 butachlor 처리와 조기담수직후 pyrazosulfuron-ethyl·molinate, azimsulfuron·cyhalofop-butyl·molinate, cyhalofop·pretilachlor·pyrazosulfuron-ethyl, pyrazosulfuron-ethyl·mefenacet의 체계처리는 파종후 60일 까지 90% 이상의 잡초 방제효과를 보였다.

영어초록

The experiments were conducted to establish effective weed control methods and to screen promising herbicides in dry direct-seeded rice at the National Yeongnam Agricultural Experiment Station, National Crop Experiment Station and National institute of Agricultural Science and Technology from 1996 to 1998. Cyhalofop-butyl·bentazon ME, cyhalofop-butyl·pendimethalin EC and pyribenzoxim EC were very effective as foliar applied herbicides to control weeds (4∼5 leaf stages of barnyardgrass) at 20∼25 days after seeding (DAS) in direct seeding. Especially, cyhalofop-butyl·pendimethalin EC can also control barnyardgrass of 7∼8 leaf stages by over 95% at application of over 1.5 double rate (7L per ha), but E. oryzicola among Echinochloa species at application of under 6 L per ha was partly revived. In dry seeded rice, permanent flooding is recommended when rice plants reach about 3∼4 leaf stage but many farmers are practicing early flooding at 2∼3 leaf stage (12 to 15 DAS) due to weed control problem. Accordingly, Treatment of single herbicide such as pyrazosulfuron·molinate GR, cyhalofop-butyl·azimsulfuron·molinate GR, pyrazosulfuron·mefenacet GR and chyalofop-butyl·pretilachlor·pyrazosulfuron GR at 2 days after early flooding (17 DAS) showed low control efficacy of 75∼85% but systematic application of butachlor EC at 5 DAS followed by those above mentioned herbicides at 17 DAS displayed excellent control efficacy of 94∼98% at 30 days and 91∼93% at 60 days, respectively. In addition, the systematic treatments also could control troublesome weeds in dry direct-seeded rice such as barnyardgrass and marsh dayflower very effectively.

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