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江苏省苏州地区,从稻麦两熟制改为双季稻麦三熟制(简称双三制)以后,群众反映有较多田块的土壤发僵.所谓”土发僵”就是耕层土壤持水能力强,不易排除,秋耕时“坌坌一条缝,敲敲一个洞”,土壤通透性差.而秋耕特别是冬灌时某些地区土壤表面出现盐霜,也是土壤发僵的一个表现现象,乃因发僵土壤通透性差盐分有所积累之故.据报导,江苏宜兴、上海郊县、湖北浠水和福建蒲田等地亦有水稻土发僵问题存在的报导.
After the change from rice-wheat double cropping system to double cropping rice and wheat-three-sowing system (referred to as Shuangsan system), the masses of the people in Suzhou, Jiangsu Province, showed more stiff soil in the fields. Water ability, not easy to rule out, autumn plowing, “a crack, knock knock a hole,” poor soil permeability, and autumn plowing, especially winter irrigation in some areas of soil surface salt cream, but also a manifestation of stiff soil The phenomenon is due to the poor salt permeability of the frozen soil which has been reported. There are also reports of the stiffening of paddy soil in Yixing, Shanghai, Hubei, Xishui, Hubei and Kamata, Fujian.