Anaerobic incubation of soil after addition of different types of organic fertilizers
Replacing part of the chemical fertilizer with organic fertilizer with the same N fertilizer application rate can improve soil fertility and increase the utilization of inorganic nitrogen fertilizer, which is an effective way to achieve stable crop yields while achieving environmental benefits. Different organic manure fertilizers have different effects on nitrogen metabolism. When organic fertilizers are mixed into the soil during field fertilization, some anaerobic zones may form in the soil, where strong denitrification reactions may occur. Organic fertilizers take a long time to decompose in the soil, and the changes of different organic fertilizer components during this process may affect the bacterial community and its function differently. In order to compare the effects of different types of organic fertilizers at the same time points and the decomposition of the same organic fertilizers over time on the soil nitrogen cycle, we conducted a one-year continuous anaerobic incubation experiment in our laboratory. Three types of organic fertilizers were used in this study including digestate of anaerobic pig manure fermentation, compost of pig manure, and straw.