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控水试验结果表明，在甘薯生长前期（特别是扎根发棵期）控水对块根产量的影响最大，甘薯块根产量形成最适宜的土壤含水量为６１％～８０％，但不同生长时期适宜的土壤含水量不同。同一土壤水分处理，控水时间的长短不同对块根产量的影响也不同。
The results of water control experiment showed that water control had the greatest effect on the tuber yield in the early stage of sweet potato growth, especially in the root stage. The most suitable soil water content of sweet potato tuber yield was 61% ~ 80%, but the suitable growth rate Soil moisture content is different. The same soil moisture treatment, control the length of time on the impact of different root tuber yield.