For treatments of combing organic fertilizer with NPK and PK, NPK and abandoned land, the rate of humic acid carbon to humus acid carbon increased and opposite to rate of fulvic acid carbon to humus acid carbon.

• 有机肥配施NPK、磷钾及氮磷钾化肥和撂荒土壤:胡敏酸碳/腐殖酸碳比值上升,富里酸碳/腐殖酸碳比值下降;