The effect extent of soil property for wheat yield was analyzed by using correlation analysis, grey associate analysis and rough sets theory.
运用简单相关、灰色关联分析方法和粗糙集理论，分析了土壤特性对小麦籽粒产量的影响。
Then the direct and indirect effect of each main parameter selected on the formation of yield were determined with path analysis.
通过对三个主因子通径分析，明确其对产量构成的直接和间接效应。
The rational fertilization areas in different precipitation years were put forward, and analysis on the fertilization plan for the maximum yield and optimum economic effect was made.
并提出了不同降水年型的合理施肥范围，分析了最大和最佳产量的施肥组合及其经济效益。
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