Changes of physicochemical properties and maturity evaluation of camellia oleifera shell and silkworm excrement co-composting
Camellia oleifera shell and silkworm excrement are mixed and aerobic composted according to different ratios,and the changes of physicochemical properties during composting process are monitored.The duration of high temperature ≥50 ℃,mass ratio of carbon to nitrogen and seed germination index are selected to evaluate composting maturity by grey correlation analysis method.The results show that the pH of the treatments with silkworm excrement addition are neutral or weakly alkaline,and the maximum temperature,duration of high temperature≥50 ℃ and cation exchange capacity(CEC)are higher than that of control;Mass ratio of carbon to nitrogen of each treatment decreases significantly after fermentation,CEC increases with the fermentation process,and the seed germination index is above 70％,which shows little toxicity to plants.Grey correlation analysis results show that after 40 days of composting,the treatment with initial mass ratio of carbon to nitrogen of 20 reaches complete maturity,and the treatment with initial mass ratio of carbon to nitrogen of 25 reaches better maturity,while the remaining treatments are not fully matured throughout the process.In summary,adding silkworm excrement can effectively accelerate the decomposition of camellia oleifera shells,and it is advisable to adjust the initial mass ratio of carbon to nitrogen to 20-25.
NETL
NSTL
万方数据
