黄腐酸作用机理（一）改良土壤................................................................................................................................................................2一、我国土壤现状........................................................................................................................................................21、北方土壤碱性的形成..........................................................................................................................................22、土壤盐化..............................................................................................................................................................23、大棚土壤盐渍化..................................................................................................................................................24、造成土壤板结的原因..........................................................................................................................................25、南方土壤酸性的形成..........................................................................................................................................26、大棚土壤酸化原因..............................................................................................................................................27、土壤板结、酸化、盐化的危害..........................................................................................................................2二、黄腐酸改良土壤....................................................................................................................................................21、黄腐酸对土壤团粒结构的影响..........................................................................................................................22、黄腐酸增强土壤的保水性、保肥性..................................................................................................................23、调节土壤溶液pH................................................................................................................................................24、降低盐分..............................................................................................................................................................25、减轻重金属污染..................................................................................................................................................26、生物作用..............................................................................................................................................................2（二）提高肥料利用率....................................................................................................................................................2一、对氮肥的增效作用................................................................................................................................................2二、对磷肥的增效作用................................................................................................................................................2三、对钾肥的增效作用................................................................................................................................................2四、促进微肥吸收，有效解决缺素症..................
