在模型中引入土壤水盐动态模型作为控制条件，最后编制了计算程序。

Lead into soil water salt dynamic model as terms of controlling, finally compile the calculation procedure among model.

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最后通过线性参变控制，获得了用有限维数线性矩阵不等式描述的充分条件。

A sufficient condition is obtained using finite dimension linear matrix inequalities (LMI) describing by linear (parameter-variety) control.

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最后，利用李雅普诺夫函数概念和方法得到了闭环控制系统具有大域渐近稳定性的充分条件。

Finally, by using the concept and method of the Lyapunov function, a sufficient condition for the approximate stability in the large field of the closed-loop control system is derived.

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