Nitrogen And Phosphorus Transformations In Dairy Manure Fermentation

At present, a lot of attention has been paid to the manure of livestock and poultry, which can be considered as reusable resources. Since the components of manure are different in different areas, the physical, chemical and biological properties of the fermentation products are different. In other hand, most researches were accomplished under the laboratory simulation conditions, which could only represented partly the transformation of manure under realistic field conditions. This experiment was conducted in WanDaShan Dairy Factory using dairy manure (DM) as the experimental materials by inoculating microbes and adding inorganic phosphorus in the fermentation process. The nitrogen transformation and phosphorus dissolving capability were studied during the fermentation.The results are as follows:1, The loss of total nitrogen and acid hydrolyzed nitrogen under treatments with inoculating microbes were significantly higher than that of the treatment without inoculating microbes, but the difference was not significant after the fermentation process. The amide-N and aminosugar-N appeared one peak in the high-temperature period of DM fermentation, and then became stable gradually in the mature period. The content of amide-N was lower under treatments with inoculating microbes than that of treatment without inoculating microbe at different phases, but the content of aminosugar-N had a reverse trend.2, The content of ammonia N significantly decreased at the initial phase of the fermentation, then raised gradually in the mature period. After the fermentation process, the contents of ammonia N under treatment with inoculating microbes were not significantly higher than that of the treatment without inoculating microbes. The content of nitrate N had a reverse trend. The content of available N decreased initially (0～7d), then increased gradually (7～28d), and then decreased again over the fermentation process.3, Results of 15N tracer showed that the total content of fertilizer N significantly decreased at the initial phase of the fermentation, then increased gradually in the mature period. After the fermentation process, the content of fertilizer N under the treatments of DM+EM0, DM+EM50, DM+EM100, DM+EM150 and DM+EM200 decreased 8.77%, 6.26%, 6.26%, 2.76%, 3.51% respectively, which further proved that decomposing rate of organic matter under treatments with inoculating microbes was higher than that of the treatment...