利用最优回归设计方法对测定结果进行处理，建立了数学模型。

The results are processed on computer with the Optimum Regression Design Method. By doing so, several mathematical models are set up.

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采用三因素五水平最优回归设计，研究了黄泥土配施氮钾硫肥对大白菜产量和硝酸盐含量的影响。

An optimum regression design with three factors and five levels was adopted to find the effects of n, K and s fertilizers on the yield of Chinese cabbage and the nitrate content in its plant.

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其次，组合d最优回归设计和D最优区组设计BIBD构造d最优设计并给出寻找新的D最优设计点的方法。

Secondly, it combines Doptimal regression design with BIBD to construct Doptimal design, and gives a method for obtaining new Doptimal design points.

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