秋季低温影响后季稻开花结实,往往造成大面积减产。目前防御低温伤害有化学的和物理的两种途径。本文介绍物理防御,即利用某些药物来提高水稻植株的体温或改变农田小气候,以减免低温伤害。物理防御中有成膜物质和气孔关闭剂两类。成膜物质喷于水稻植株上形成一层极薄的人工膜,可降低蒸腾、减少汽化热的损失,使水稻体温和农田小气候的温度有所提高;气孔关闭剂喷于水稻植株上,使气孔开度减小或关闭,同样能降低蒸腾、提高植株体温和农田小气候温 After the low temperature impact of autumn rice flowering and strong, often resulting in large-scale production. Currently there are two chemical and physical ways to prevent cold damage. This article describes the physical defense that uses certain drugs to increase the body temperature of rice plants or to change the microclimate of the farmland in order to reduce cold damage. There are two types of film-forming substances and pore-closing agents in physical defense. Film-forming material sprayed on the rice plant to form a layer of very thin artificial membrane can reduce transpiration and reduce the heat of vaporization loss, so that the body temperature and farmland microclimate temperature has increased; stomatal closure agent sprayed on rice plants, so that stomatal Reduced opening or closing, the same can reduce transpiration, improve plant temperature and farmland microclimate