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Analysis on Irrigation Characteristic of Cotton under Film through Lysimeter
Author(s): 
Pages: 9-10,14
Year: Issue:  5
Journal: WATER SAVING IRRIGATION

Keyword:  入渗量根系吸水影响深度日耗水量利用地下水量;
Abstract: 利用不同地下水埋深的地中仪进行地膜棉的灌溉试验,分析了地膜棉不同生育期时蒸发、入渗的变化特征:受地膜棉的蒸腾作用,灌溉入渗量随其日耗水量增加而显著减少;棉花根系吸水影响深度与其日耗水强度成指数关系,其根系吸水最大影响深度为2.76 m;棉花根系利用地下水量随埋深增加而减小,棉田最佳的灌水湿润深度应小于1.0 m,当灌水湿润深度超过1.5 m时,其根系不能更多利用地下水,即可认为是深层入渗.
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