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本试验采用池栽控水法，研究了甘薯高产栽培条件下的需水状况。结果表明：甘薯的蒸腾系数和田间耗水系数比一般大田作物低，说明甘薯对水分的利用较为经济。但其田间耗水量相当大，全生育期为５６７０～５７７５ｔ／ｈｍ２．土壤含水量与甘薯蒸腾量和耗水量、蒸腾系数和耗水系数均呈极显著的正相关。为了提高甘薯产量及其对水分的利用率，大田生长期间土壤相对含水量以６０％～７０％为宜。
In this experiment, the water-saving plan was used to study the water requirement of sweet potato under high-yielding cultivation conditions. The results showed that the transpiration coefficient and field water consumption coefficient of sweet potato were lower than that of field crops, which indicated that the utilization of water by sweet potato was more economical. However, its field water consumption is quite large, the whole growth period of 5670 ~ 5775t / hm2. Soil water content had a very significant positive correlation with transpiration and water consumption, transpiration coefficient and water consumption coefficient of sweet potato. In order to improve sweet potato yield and water use efficiency, soil relative growth during field growth of 60% to 70% is appropriate.