本田期施用多效唑能使水稻植株显著矮化,防止或减轻因倒伏而导致的减产(汤日圣等,1986,江苏农业科学2,6)。为探讨多效唑在水稻上的适宜施用时期、剂型、剂量和施用方法,自1984～1986年作了系统研究,现报道如下: 材料和方法 供试品种系高秆品种龙睛4号。试验用多效唑剂型有可湿性粉剂(有效成分14％)和乳剂(有效成分10％)两种。试验在丹阳练湖农场试验站3号田进行。分三个试验: Hypogastric use of paclobutrazol significantly dwarfed rice plants and prevented or reduced yield loss due to lodging (Tang et al., 1986, Jiangsu Agricultural Sciences, 2, 6). To study the suitable application period, dosage form, dosage and application method of paclobutrazol in rice, systematic research was made from 1984 to 1986, and the report is as follows: Materials and Methods The high-stalk variety Longtong No.4 was tested. The experimental paclobutrazol dosage forms are wettable powder (active ingredient 14%) and the emulsion (active ingredient 10%) two. The experiment was conducted in No.3 Farm of Dan Yang Lianhu Farm Experiment Station. Divided into three experiments: