Dynamic changes of total N, P, K and organic matter in different treatments on cattle manure composting.

【Objective】In order to achieve the innocuous treatment and resource utilization of livestock manure.【Method】 Fresh cow dung,maize straw and biological decomposition agents were as a pile material,then added 0.05%,0.5% and 1% of the biological decomposition agents and 5% of the maize straw.Five different treatments of aerobic composting systems were made and without any treatment of fresh cow dung as control,the dynamic changes of total nitrogen,phosphorus,potassium and organic during the composting were studied.【Result】The results showed that: at the end of the compost,the relative content of total nitrogen increased,while added 1% to cow dung decomposition of biological agents could reduce the loss of nitrogen.The influence of different treatments on total phosphorus,total potassium was not significant,the relative content of them increased slightly.【Conclusion】The organic content was periodically changed,and the total content decreased.