银杏残叶添加比例对猪粪好氧堆肥的影响

采用好氧堆肥方法,研究了不同银杏残叶添加比例(质量分数0%、10%、20%,30%,40%)对猪粪堆肥的影响,结果表明:添加质量分数20%和30%银杏残叶堆肥在第3天分别达到最高温65 ℃和63 ℃,且高温阶段(>55 ℃)持续时间达7 d,完成主要发酵过程约需28 d,明显少于未添加银杏残叶堆肥(对照)所需时间(约37 d)。堆熟后,各处理堆肥有机碳含量(质量分数)在25%～28%之间,无显著差异,均符合有机肥国家标准。各处理堆肥全N(TN)含量(质量分数)在2.26%～3.20%之间。与对照相比,添加质量分数20%银杏残叶处理TN增加最高,达41.5%。各处理堆肥的碳氮比(C/N)和T值(堆肥结束与初始C/N的比)均符合猪粪堆肥腐熟标准(C/N<20、T值<0.6)。添加质量分数20%和30%银杏残叶处理的种子发芽指数在堆制28 d时,已达80%以上,而其他处理则在35 d后才达到。综合来看,添加质量分数20%～30%的银杏残叶有利于猪粪好氧堆肥的熟化、稳定及质量提高。

Aerobic composting of pig manure amended with different ratios of ginkgo leave residues

For the purpose of resourceful utilization of the ginkgo leave residues(GLR), the effects of GLR mass ratios(0%, 10%, 20%, 30% and 40%)on aerobic composting of pig manure were studied in this paper. The results showed that the temperature in the composts added with 20% and 30% of GLR raised to its maximum value of 65 ℃ and 63 ℃ respectively in the third day, and their high temperature over 55 ℃ maintained for 7 days during composting. Only 28 days were spent for the main fermentation process(over 40 ℃)in the composts with 20% and 30% GLR, obviously less than that in the control compost added no GLR. After composting, the organic carbon content in all composts was 25%-28%, fitted the national standard of organic fertilizer(NY525-2012), and didn't present significant differences between the composts. Total nitrogen(TN)content in all composts was 2.26%-3.20%. The TN content in the compost with 20% GLR was 3.20% and increased by 41.5% compared with the control. Both C/N and T value(the ratio of the C/N at the end of composting to that at the beginning of composting)in all composts were fitted with the maturity standard of pig manure compost(C/N<20, T<0.6). The germination index(I_G)of corn was over 80% in the 28th day during composting for the composts with 20% and 30% GLR, while for the other composts over 35 days were spent. Comprehensively, the mass ratio of 20%-30% GLR was more benifit to the aerobic composting of pig manure.