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田间和盆栽试验研究表明叶水势日变化曲线因供水和生育时期而不同.黎明前叶水势(ψl~(pre))开花期低谷十分明显,与土壤水分动态变化不一致;午后叶水势(ψl~(mid))表现为前期低中期高后期渐降的变化特点,不同水文年型间存在差异.生育中后期叶水势与深层土壤水分含量的相关程度增强,开花期叶水势与产量关系最为密切.前期控水式的节水栽培在一定程度上降低生育期叶水势,可通过渗透调节功能和较高膨压的维持稳定高产.
The field and pot experiment showed that the diurnal variation curve of leaf water potential varied with water supply and growth period.The water potential (ψl ~ (pre)) before dawn was very low at flowering stage, which was inconsistent with the dynamic change of soil water content. The leaf water potential (ψl ~ mid) showed the characteristics of early-stage low-mid-high-late decline, and there were differences between different hydrological years.The correlation between leaf water potential and deep soil moisture content was enhanced in middle and late growth stages, and the relationship between leaf water potential and yield was most closely related to flowering stage Water-saving water-saving cultivation to a certain extent, reduce the growth of leaf water potential, through the osmotic adjustment function and high turbulence to maintain stable and high yield.