Effect of Mixed Herbicides on Phytotoxicity of Azimsulfuron in Rice and Barnyardgrass

벼와 피에 대한 Azimsulfuron의 작용성(作用性)에 미치는 혼합제초제(混合除草劑)의 영향(影響)

Effect of azimsulfuron {1-(4,6-dimethoxypyrimidin-2-yl)-3-[1-methyl-4-(2-methyl-2H-tetrazol-5-yl) pyrazol-5-ylsulfonl]urea} combined with eight annual herbicides on shoot and root growth of rice (Oryza sativa L.) and barnyardgrass [Echinochloa crus-galli (L.) P. Beauv.] was investigated. Annual herbicides used were four thiocarbamates (dimepiperate, molinate, esprocarb, and thiobencarb), two acetanilides (butachlor and pretilachlor), one urea (dymron), and one oxadiazole (oxadiazon) herbicide. Growth inhibition in rice shoot was greater with azimsulfuron mixed with the annual herbicides than with azimsulfuron only. The azimsulfuron mixtures did not bring about decrease in growth inhibition of rice shoot. However, safening effect in root growth of rice was obtained when dimepiperate, molinate and dymron were combined with greater than 10ppm of azimsulfuron. Greater inhibition in shoot and root growth of rice occurred with straight chain hydrocarbon substitute such as esprocarb and thiobencarb than with cyclohydrocarbon substitute such as dimepiperate and molinate. Application of the azimsulfuron mixtures resulted in increase. in growth inhibition of shoot and root growth of barnyardgrass as compared with when azimsulfuron only was applied.

일년생(一年生) 방제용(防除用) 제초제(除草劑) 8종과 혼합(混合)된 azimsulfuron의 벼와 피의 지상부(地上部) 및 뿌리 생육(生育)에 끼치는 영향(影響)을 조사(調査)하였다. 벼 지상부는 일년생(一年生) 제초제(除草劑) 혼합처리(混合處理)가 azimsulfuron 단독(單獨) 처리(處理)보다 큰 생육억제(生育抑制) 효과(效果)를 나타내었으나, 어느 경우에도 약해(藥害) 경감(經減) 효과(效果)는 없었다. 벼 뿌리에 대한 약해 경감 효과는 10ppm 이상의 azimsulfuron에 혼합(混合)된 dimepiperate, molinate 및 dymron 에서만 나타났다. 벼 지상부(地上部) 및 뿌리의 생육억제(生育抑制) 효과(效果)는 직쇄상(直鎖狀) 탄화수소(炭化水素) 치환체(置換體)인 esprocarb나 thiobencarb의 혼합(混合)이 환상(環狀) 탄화수소(炭化水素) 치환체(置換體)인 dimepiperate나 molinate의 혼합(混合)에서 보다 크게 나타났다. Azimsulfuron에 대한 일년생(一年生) 제초제(除草劑)의 혼합(混合)으로 피의 지상부(地上部) 및 뿌리 생육억제(生育抑制) 는 azimsulfuron 단독(單獨) 처리(處理)에 비하여 크게 증대(增大) 되었다.