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对长期施用化肥和有机肥腐殖质结合形态进行了系统研究，结果表明，土和黄绵土腐殖质以紧结态含量为主，其次是松结态，再次是稳结态；长期施有机肥或配施化肥，土壤腐殖质含量增加，松／紧（松结态／紧结态，下同）比值提高；长期施用化肥，紧结态腐殖质含量增加，松／紧比值降低；与松结态腐殖质关系最为密切的农化性状是碱解氮和速效磷，与稳结态腐殖质关系最为密切的是速效磷和ＣａＣＯ３，与紧结态腐殖质关系最为密切的是碱解氮和全氮。
The long-term application of chemical fertilizer and organic manure combined with humus morphology, the results show that soil and loessial soil humus to tight-knit content, followed by loose knot, and then steady-state; long-term application of organic manure or fertilizer Fertilizers, soil humus content increased, the ratio of loose / tight (loose / tight state, the same below) increased; long-term application of fertilizers, tight junction humus content increased, loose / tight ratio decreased; The agronomic characters are available nitrogen and available phosphorus. The most closely related to the steady state humus is available phosphorus and CaCO3. The most closely related to the tightly bound humus is the alkaline hydrolysis and total nitrogen.