Meta-analysis Of Livestock And Poultry Manure Utilization And Evaluation Of Composting Pollution Gas Emissions

In order to get a clear understanding of the comprehensive utilization of livestock and poultry waste in China,this paper uses Meta method to analyze the comprehensive utilization of livestock and poultry waste in China,the impact of greenhouse gases and organic fertilizer return on soil organic matter and crop growth,and the main conclusions are as follows:1.By analyzing the current situation of comprehensive utilization of livestock and poultry manure in various regions,the results showed that the comprehensive utilization rate of livestock and poultry manure,the matching rate of farm equipment,the utilization rate of organic fertilizer,the return rate of farmland and the utilization rate of biogas in Northeast China were 64%,76%,15%,58%and 7%respectively;60%,79%,11%,56%and 22%respectively in North China;69%,88%,12%,53%and38%respectively in Central China;In South China,the comprehensive utilization rate,the matching rate of farm equipment,the utilization rate of organic fertilizer and the return rate were 78%,89%,11%and 59%respectively;77%,95%,10%,61%and12%respectively in East China;77%,89%,16%,58%and 8%respectively in Northwest China;In Southwest China,70%,93%,21%,62%and 16%respectively.The utilization status of livestock and poultry manure in different regions is different,and the main utilization direction is also different,but the overall utilization of livestock and poultry manure needs to be further developed.2.The effects of additives on gas emission from livestock manure composting were studied.The addition of zeolite,calcium superphosphate and biochar in pig manure composting has a significant effect on the emission reduction of NH₃,N₂O,CO₂and CH₄;The addition of bacterial agents,calcium superphosphate and biochar in chicken manure composting process had good emission reduction effects on NH₃,H₂S,N₂O and CH₄;The addition of zeolite,calcium superphosphate and biochar in the process of cow dung composting has different emission reduction effects on NH₃,N₂O and CH₄.3.Effects of returning livestock and poultry manure to field on soil organic matter and potato yield.The total effect of different amount of manure on soil organic matter was 18%.The total effect of different years of organic fertilizer application on soil organic matter was 17%.The total effect of different fertilizer application amount on potato yield was 23%.The total effect of different years of organic fertilizer application on potato yield was 22%.