There are obvious mutuality in the plant biomass, grain N content, Total amount of N absorption with yield, grain N content have maximal immediate effect to yield.
植株干重、子粒氮含量、总吸氮量与产量显著相关，子粒氮含量对产量的直接影响最大。
The total income of national economy and the amount of population are predicted with second-degree moving model and with the principle of least mean square fit error determining designated value n.
利用二次移动平均模型，引入均方拟合误差最小的原理确定出时段数n，对国民经济总收入、人口数量等项目进行了预测。
The results indicated that the soil organic matter and total N of 26-year-old PBCA stand increased. the activities of soil biochemistry strengthened. the amount of available nutrient supply enhanced.
得出结果：26年生杉阔轮栽模式土壤有机质和全N含量增加．土壤生化活性加强．土壤速效养分供应量增强；
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