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通过高C／N比值麦秸的“氮因子效应”调控土壤（肥料）氮固定-矿化动态作为大豆保护性施氮的手段。从大豆结瘤、固氮活性、木质部溶质氮形态以及植株同化氮量论证了保护性施氮的生物学效应。试验表明，保护性施氮不仅颇大缓解乃至完全消除了氮肥对大豆结瘤和固氮活性的抑制，提高了木质部中酰脲态氮的相对丰度和有机态氮含量，保护了共生固氮体系正常发育及其功能发挥的前提下，又提高了土壤的供氮水平，从而为大豆籽实蛋白质的合成创造了一个根瘤氮和土壤（肥料）氮协调供应的营养条件。因此，在田间施氮20和40kg／hm2条件下，保护性施氮处理比常规施氮处理，秸秆氨产量分别相对提高了5．1和23.0％；种子氮产量分别相对提高了52．4和32．6%。
Nitrogen Fixation - Mineralization Dynamics of Soil (Fertilizer) as a Means of Protective Nitrogen Application in Soybean through “Nitrogen Factor Effect” of High C / N Ratio Wheat Straw. The biological effects of protective nitrogen application were demonstrated from nodulation of soybean, nitrogen fixation activity, solute nitrogen form of xylem and nitrogen assimilation of plant. The results showed that the protective nitrogen application not only greatly relieved and even completely eliminated the inhibition of nitrogenous fertilizer on the nodulation and nitrogen fixation activity of soybean, but also increased the relative abundance and organic nitrogen content of the urease nitrogen in the xylem and protected the normal nitrogen fixation system Development and function of the soil, it also increases the level of nitrogen supply to the soil, thereby creating a nutrient condition for the coordinated supply of nitrogen and soil (fertilizer) nitrogen to the synthesis of soybean seed protein. Therefore, under the conditions of nitrogen application of 20 and 40 kg / hm2, protective nitrogen application increased 5.1 and 23.0% respectively compared with conventional nitrogen application and straw production, while the yield of seed nitrogen increased by 52.4 and 32.6%.