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本文全面分析了低丘红壤区的降水蒸发，土壤贮水供水和作物的耗水规律。表明降水量超前于潜在蒸发量变化是伏秋旱的主因。红壤的贮水空间又不多．能够供植物利用的有效水更低，仅占红壤总库容的１／５。只是其通透库容较大，深层水分比较丰富而稳定，通过农林复合等途径调控深层水分，促进土壤一植物一环境间的水分交换，是开发利用该区农业资源的关键
This paper comprehensively analyzed the rainfall evaporation in the hilly red soil area, soil water storage and water supply and crop water consumption. It shows that the change of precipitation before the potential evaporation is the main cause of autumn precipitation. Red soil storage space is not much. The available water that can be used by plants is even lower, accounting for only 1/5 of the total volume of red soil. However, its large capacity for transparence, abundant and stable deep water, regulation of deep water through agroforestry, and promotion of water exchange between soil and plant-environment are the key to exploiting and utilizing agricultural resources in this area