长江下游地区,在三麦生育期间,由于雨水过多,而且分布不匀,常使三麦发生湿害,有时造成严重减产。三麦的湿害在各个生育阶段都有发生。苗期受湿害,次生根发生量大大减少,初生根伸展受到抑制。同时苗小瘦弱叶黄,形成僵苗,不分蘖或很少分蘖。如果在拔节抽穗期受湿害,引起根系发育不良,根量减少,扎根浅,活力衰退,植株黄叶增多,茎秆细弱。 In the area of ​​the lower reaches of the Yangtze River, during the growth period of Sanmai, due to the excessive rainfall and the uneven distribution, it often caused the occurrence of wet injury in Sanmai, sometimes resulting in serious decrease of production. Three wheat wet injury occurs in all stages of fertility. Moisture damage at the seedling stage, the secondary roots significantly reduce the amount of birth, root growth was inhibited. At the same time Miao small thin yellow, forming stiff Miao, no tillers or few tillers. If the wetting at jointing and heading stage, causing poor root development, reducing root volume, rooting, vitality decline, increased yellow leaves, thin stems.