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１９８６～１９９０四个年度研究结果显示，叶水势日变化因供水及生育时期而不同。黎明前叶水势随生育进程而变化，开花期出现明显低谷，与土壤水分动态变化不一致；午后叶水势具有规律的阶段性变化，且因不同水文年型出现年际间差异。叶水势与土壤含水量呈曲线关系，随生育进程，叶水势与深层土壤水分的相关性增强。开花期叶水势与产量关系最为密切。前控式节水栽培可通过渗透调节维持较高膨压而高产。提出了不同水文年型高产节水主要生育期午后叶水势下限指标。
The results of the four annual studies from 1986 to 1990 showed that the diurnal changes of leaf water potential were different due to water supply and growth period. The trend of water potential before the dawn changed with the process of growth and development, and the trough was low at the flowering stage, which was inconsistent with the dynamic change of soil moisture. The leaf water potential in the afternoon had a regular stage change, and the interannual difference appeared in different hydrological years. Leaf water potential and soil moisture content curve, with the growth process, leaf water potential and deep soil moisture increased correlation. Flowering leaf water potential and yield the most closely. Pre-control water-saving cultivation can be adjusted by infiltration turmoil and high yield. Proposed different hydrological year high yield water-saving main growth period afternoon leaf water potential limit index.