最后，根据冬小麦的需水规律和土壤有效水含量构造干旱指数模型。
At last, a drought index model was developed by considering the water requirement of winter wheat and the available soil water content.
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.
结果表明：土壤质地、保水剂用量对土壤有效水含量的影响达到极显著水平，而保水剂粒径对土壤有效水含量的影响不显著。
The mathematics model for the relationships among soil available water content with soil texture, particle diameter and dosage of super absorbent ploymer(SAP) was deduced.
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