植物开始发生永久凋萎时的土壤含水率，也称凋萎含水率或萎蔫点。一般来说，凋萎系数与田间持水量之间的土壤水，属于有效水分。
土壤凋萎系数虽有增大趋势，但增幅很小，土壤有效水容量明显增大。
Though the wilting coefficient of soil tend to increase as water retaining agents increased, the amplitude was low, so the soil available water capacity augmented obviously.
基于清徐大田土壤试验研究了土壤的凋萎系数与其土壤物理性粘粒含量、有机质含量以及土壤全盐含量之间的关系。
The relation between the wilting point with the soil physics characters as clay content, organic matter content and the salt content have been studied based on the experiments in field.
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