quantitative study of fertility
生育率的联立方程模型 birth rate simultaneous equation model 生育率的数量研究 quantitative study of fertility 生育率估计的回归模型 regression model for fertility estimation ..
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From the point of view of soil comprehensive fertility and considering the dependence of crops on the fertility factors, the results of quantitative study of the soil fertility level are shown.
从综合肥力的观点出发，结合作物对各肥力因素的依赖程度，对土壤肥力水平进行了定量研究。
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