A eight years long-term experiment with five different kinds of fertilizer application treatments were conducted. The relationship
between dynamic changes of oxidation stability of soil
organic matter and fertility was studied. The results showed that with readily oxidizable organic matter decrease under long term no fertilization or constant N,P,K chemical fertilizer application, total soil organic matter decreased. And soil fertility decreased. With increment N,P,K chemical fertilizer applied successively, soil organic matter and
oxidation stability coefficient kept steady with high kos. Under long term organic manure used together with constant N,P,K fertilizer, soil readily oxidizable organic matter and total organic matter increased significantly. Oxidation stablility coefficient decreased.Reserves and supply of soil nutrient improved. And the crop yield was significant higher than incrememnt N,P,K chemical fertilizer treatment. There were obvious effect on soil readily oxidizable organic matter and little effect on difficultly oxidizable organic matter with different fertilization treatments.