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1.及时排水 棉田水淹后,土壤理化性状发生变化。江苏盐都县1991年涝灾后,全县平均耕层减少1.2厘米,土壤容重增加0.1克,水解氟降低5.35毫克/千克,速效钾降低33毫克/千克。同时,根系的生长和功能受阻。因此,排水早迟对棉花的影响较大。在各项农业措施相同时,淹水深度50厘米,8天排除积水的棉花与12天排除积水的棉花相比,最后株高多10.2厘
1. Timely drainage of cotton fields after flooding, soil physical and chemical properties change. After floods in 1991 in Yandu County of Jiangsu Province, the average plow weight of the whole county decreased by 1.2 cm, the soil bulk density increased by 0.1 g, the hydrolyzed fluoride decreased by 5.35 mg / kg and the available potassium decreased by 33 mg / kg. At the same time, the growth and function of the root system is blocked. Therefore, the impact of early drainage on cotton is greater. In the same agricultural practices, flooding depth of 50 cm, 8 days to exclude the accumulation of water and cotton 12 days to exclude stagnant water compared to the final plant height 10.2%