本研究探討除草劑6%欣克免速隆水懸劑（主成份為5%欣克草＋1%免速隆），在臺灣地區不同氣候環境下施用，對一、二期作移植水稻田雜草防治效果及稻株藥害之評估，以訂定安全有效之使用方法，提供農民應用之依據。綜合藥效及藥害試驗結果，測試藥劑欣克免速隆於插秧後7~8日（一期作）或5~6日（二期作），以每公頃3.0或3.5公升之原液沿畦畔行走均勻撒佈，施藥後保持積水3~5日，水深3~5公分，可有效防除稗草、鴨舌草、球花蒿草及心葉母草等水田雜草，但每公頃3.5公升之防治劑量效果較佳。對稻株生育及稻穀產量，不會引起異常及減產之藥害發生。

Chemical weed control with effective and highly active herbicides has been very useful and convenient means. It has contributed to stable crop production and is labor saving. Recent herbicides have had characteristics such as high effectiveness without causing environmental pollution or harmful effects, and appropriate herbicides having high activity, low toxicity, high selectivity and being non-persistent have been developed. Trials were conducted to evaluate the paddy field utility of a premix of thenylchlor and bensulfuron-methyl. The treatments included the premix at two rates, and two standard treatments-butachlor and butachlor/bensulfuron-methyl. The experiments were conducted by Taichung, Kaohsiung and Taoyuan District Agricultural Research and Extension Stations to evaluate this chemical for rice crop tolerance and efficacy of weed control. Echinochloa crus-galli, Cyperus difformis, Monochoria vaginalis, and Lindernia cordiforia were controlled with high efficiency by applications of the premixture of thenylchlor plus bensulfuron-methyl with 0.3 and 0.35L/ha. This mixture at 0.3 and 0.35kg/ha was safe on tested rice cultivars. They can be applied at 7~8 days (1(superscript st) crop) or 5~6 days (2(superscript nd) crop) after rice transplanting and have to date proven very effective in the control of a wide range of annual and perennial broad leaf weeds, as well as sedges.