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稻田的水层,除了供给稻株的生理需水外,是作为一项农业技术措施来调节土壤温度,控制土壤的物理、化学状况,和微生物活动状况,从而节制土壤中的水分、养分供应,进一步主动地控制了稻株的生长发育,而获得增产。稻田水层的变化不外乎:(1)灌水深浅,(2)排水的次数,(3)排水的久暂,(4)干田的程度等,
In addition to the physiological water supply to rice plants, the water layer in paddy fields is an agricultural measure to regulate the soil temperature, control the physical and chemical conditions of the soil, and the activity of microorganisms so as to control the supply of water and nutrients to the soil, Further initiative to control the rice growth and development, and to increase production. Changes in paddy water layer is nothing more than: (1) the depth of irrigation, (2) the number of drainage, (3) the drainage for a long time, (4)