矮壮素(又名稻麦立)是一种农药。又名稻麦立。学名氯化2-氯乙基三甲基铵。纯品是白色晶体。有鱼腥味。溶点240～241℃。在245℃开始分解。极易溶于水和潮解。不溶于无水乙醇、乙醚、苯、二甲苯。微溶于二氯乙烷、异丙醇。一般配成水溶液。
其生理功能是控制植株的营养生长（即根茎叶的生长），促进植株的生殖生长（即花和果实的生长），使植株的间节缩短、矮壮并抗倒伏，促进叶片颜色加深，光合作用加强，提高植株的坐果率、抗旱性、抗寒性和抗盐碱的能力。
多效唑对作物生长有控制作用，能防止倒苗败苗、控长增蘖、株健防倒、增穗增产。

Aizhuangsu (also known as Daomaili) is a pesticide. Also known as Rice and wheat. Scientific name 2-chloroethyl trimethyl ammonium chloride. Pure is white crystal. It smells of fish. Solution point 240 ~ 241℃. Decomposition begins at 245℃. Highly soluble in water and deliquescence. Insoluble in anhydrous ethanol, ether, benzene, xylene. Slightly soluble in dichloroethane and isopropyl alcohol. Generally mixed with an aqueous solution.
Its physiological function is to control the vegetative growth of plants (i.e., the growth of root leaf), the reproductive growth of the plants (i.e., the growth of flowers and fruits), so that the plant between section shorten, stocky and resistance to lodging, promote the leaf color deepened, strengthen photosynthesis, improve plant fruit rate, drought resistance, cold resistance and salt resistance ability.
Paclobutrazol can control crop growth, prevent seedling collapse, control growth and increase tillering, plant health and prevent falling, increase ear and yield.