从土壤水分平衡原理出发，以降水量、温度和区域水文观测等因子为基础，建立了土壤干旱指数模型。

Based on the principle of soil water balance, including precipitation, temperature and other observations, this article built a model of soil drought index.

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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.

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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.

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