Based on the SOTER database and GIS technology, the organic carbon and nitrogen density ofdifferent soil groups and their spatial distribution were calculated and analyzed.
应用建立的河北省SOTER数据库,计算出该省不同土壤组合的土壤有机碳和氮的密度,并应用GIS技术分析该省土壤有机碳和氮密度的空间分布特征。
参考来源 - 基于空间数据库的土壤侵蚀和碳氮储量研究·2,447,543篇论文数据，部分数据来源于NoteExpress
运用二因素五水平回归正交旋转组合设计，进行施氮量与密度对油菜产量影响的研究。
Using quadratic rotational regression combination design to study the influence on yield of the rape under the different nitrogen and density.
本文从不同种植密度和施氮量对玉米籽粒产量的影响，建立了二次多项式回归方程。
Second-degree polynomials equation of maize(Zea Mays L. ) grain yield with both planting density and nitrogen fertilization was established by means of regression analysis.
本试验研究了大豆在不同密度和施氮量处理下，子粒中干物质、蛋白质和脂肪积累的动态变化。
Dry matter, Protein and oil accumulations in seeds of soybeans, under different density and nitrogen top-dressing treatments, were studied.
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