在棉花生育中、后期缺水会使株高降低,果枝数、果节数、铃数减少,铃期变短,脱落增加,导致产量下降。随土壤含水量降低,棉叶水势下降,水分饱和亏上升,叶绿素含量降低,蒸腾强度减弱。叶片水分饱和亏与土壤含水量及叶片蒸腾强度具有高度相关关系,可用作反映棉叶水分状况、指导灌溉的诊断指标。 In cotton growth, the later water shortage will reduce the plant height, the number of fruit branches, the number of fruit nodes, the number of bolls decreased, the bolls shortened, shedding increased, resulting in decreased yields. With the decrease of soil water content, the water potential of cotton leaves decreased, the water saturation loss increased, the content of chlorophyll decreased, and the transpiration intensity decreased. The leaf water saturation deficit has a high correlation with soil water content and leaf transpiration intensity and can be used as a diagnostic index to reflect the water status of cotton leaves and guide irrigation.