我国长江中下游油菜产区,冬、春季多雪、雨,特别是稻茬和地势低洼处,易出现土壤过湿或积水,发生湿(渍)害,轻的根系和地上部植株生长发育不良,病虫害增多,开花和结实不良,产量下降;严重的根部因积水缺氧而腐烂,地上部枯死,颗粒无收。1.湿(渍)害的危害油菜苗期、开花期和角果期对湿(渍)害最敏感。播种期土壤过湿、积水或板结,种子 The rapeseed producing areas in the middle and lower reaches of the Yangtze River in China are prone to wet or waterlogged soil, light and rainy winter rainy areas, especially rice stubble and low lying areas. Bad, increased pests and diseases, poor flowering and fruiting, decreased production; severe root rot due to lack of water and water, dead parts of the ground, crop failure. 1. Wet (stains) damage Harm seedling rapeseed, anthesis and fruit stage of the wet (stain) the most sensitive. Sowing soil is too wet, water or board knot, seeds