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水稻在生育后期能否使形成的穗粒达到全部成熟种实饱满,与稻田的水分状况有密切关系。撤水过早就会受到旱害,形成强制成熟,使穗部的淀粉及蛋白质蓄积受到阻碍,青米多,秕粒多,不完正粒增加,糙米率减低,直接影响了单位面积产量。反之撤水过迟则使成熟期迟缓,形成贪青,由于土壤水分过大,易使水稻倒伏遭受霜害,给秋收秋耕作业造成很大困难。
Rice in the late growth stage can make the formation of grain full maturity full seed, and water conditions in paddy fields are closely related. Water diversion will be drought early to form a compulsory maturity, so that the accumulation of starch and protein panicles are hampered, green rice and more grains, incomplete grain increases, reducing the rate of brown rice, a direct impact on the yield per unit area. Conversely, late withdrawal of water slows down the maturation stage and forms greyish green. As the soil moisture is too large, it is easy for the rice to lodging and suffering frost damage, which causes great difficulties for the autumn harvesting of autumn grazing land.