Effect of Knoxweed on The Control of Weeds in Paddy Rice

Abstract

Several combinations of Knoxweed (Eptam + MCPA) were evaluated for their weed control effect at the Chiayi Agricultural Experiment Station in the first crop of 1968. All treatments of Eptam + MCPA were found to be highly effective in controlling weeds in paddy rice and its effect was found to last more than 8 weeks after the application of this chemical. However, Eptam+ MCPA caused severe phytotoxicity to rice. Rice toxicity was found to be related to the rate of MCPA, the higher the MCPA rate, the heavier the rice toxicity. As a result, grain yields of all Eptam + MCPA treatments were 12.1 to 29.3% lower than that of hand weeded check. 有效成份含量不同之Knoxweed若干種經本分所於57年第一期作水稻田試驗結果，發現不同成分之處理均具優良之治草效果，但因對水稻之藥害極為嚴重，其每公頃稻谷產量僅達人工除草區之71~88%。