Influence mechanisms of long-term fertilizations on the mineralization of organic matter in Ultisol

Abstract The influence mechanisms of long-term fertilizations with chemical fertilizer (NPK), a mixture of chemical fertilizer and straw (NPKS), animal manure (AM), and no fertilizer (Ck) on the mineralization of soil organic matter (SOM) in an Ultisol was studied in this study. The cumulative amount and rate of SOM mineralization were stimulated by the examined fertilizations, especially AM treatment. The order Ck ≤ NPK