重要的土壤水分常数之一。指生长在湿润土壤上的作物经过长期的干旱后，因吸水不足以补偿蒸腾消耗而叶片萎蔫时的土壤含水量。萎蔫系数亦称凋萎系数、凋萎点。萎蔫系数依土壤不同而异，粘土的萎蔫系数比砂土的高。
其永久萎蔫系数均低于3%。表明这二种枣树的抗旱能力较强。
Permanent wilting coefficient of two jujube varieties both lower than 3%, jujube has higher drought capacity.
枣树幼树叶片的永久萎蔫系数为3.5 %，而枣树大树叶片的永久萎蔫系数应在3%左右。
The permanent wilting coefficient of young jujube trees was 3.5 percent, but that of elder trees was about 3 percent.
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