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通过对新修黄绵土农地有机质的田间定位与尼龙袋模拟试验研究得出：（１）新修黄绵土农地，增加施肥量，尤其是有机肥用量，是提高陕北丘陵沟壑区土壤有机质的主要途径；（２）作物根茬腐殖化系数除与生物气候条件有关外，与本身化学组成关系密切。四种作物根茬腐殖化系数为：糜子根茬＞黄豆根茬＞谷子根茬＞养麦根茬；（３）原土壤中有机质矿质化系数，以休闲地采用化学动力学一级反应方程求得的数据较稳定，并接近大田实际情况；（４）利用有机质平衡定量施肥模式，可算出在陕北黄绵土区要达到土壤有机质培肥目标的有机肥用量．
The results showed that: (1) The newly rehabilitated loessial soil farmland, increasing the amount of fertilizers, especially the amount of organic manure, is the main factor to increase soil organic matter in the hilly and gully regions of northern Shaanxi. (2) In addition to the biological climatic conditions, the coefficient of humification of crop stubble is closely related to its own chemical composition. The three kinds of crop stubble humus coefficient: the millet root stubble> soybean stubble> millet stubble> wheat stubble; (3) the original soil mineralization mineralization factor to leisurely using chemical kinetic first-order reaction equation (4) Using organic fertilizer balance quantitative fertilization mode, we can calculate the amount of organic fertilizer that will reach the goal of soil organic matter and fertilize in Huangmian area of northern Shaanxi.