玉米是一种需水量大而又不耐涝的作物。当土壤湿度超过持水量的80％以上时,植株的生长发育即受到影响,尤其幼苗期表现明显。玉米生育后期,在高温多雨条件下,根系常因缺氧而窒息坏死,造成生活力下降,植株未熟先枯,对产最影响很大。有资料表明, Corn is a crop that requires large amounts of water and is not resistant to waterlogging. When the soil moisture exceeds the water holding capacity of more than 80%, the plant growth and development are affected, especially in seedling stage obvious. Late maize growth, under high temperature and rainy conditions, the root often due to hypoxia and suffocation necrosis, resulting in decreased viability, unripe plants first dry, the most impact on production. Data show that,