上海郊区六十年代以来,随着双三熟制的发展,土壤淹水时间延长,湿耕机会增多,在湿耕辗压下犁底层变得愈加密实,水分难以下渗,水、气矛盾日益尖锐。雨水引起潜层水过多势必转化为三麦渍害,根系密集层受渍缺氧,麦根呼吸受阻,活力减弱,以至窒息而死。因此能否尽快排除潜层水已成为南方水稻土 Since the 1960s in Shanghai suburbs, with the development of ShuangSanHe system, the flooding time of soils has increased and the wetting opportunities have increased. Under the wet tillage, the bottom layer of plow has become more dense, water is more difficult to penetrate, and the contradiction between water and gas is increasingly sharp. Rain caused by excessive water potential is bound to be transformed into three wheat stains, dense roots affected by stains hypoxia, obstruction of wheat root respiration, weakened vitality, and suffocation and death. Therefore, we can quickly rule out the potential water has become the southern paddy soil