过磷酸钙在猪粪堆肥过程中的保氮效果研究

[目的]为减少堆肥过程的氮挥发损失.[方法]采用强制通风静态堆肥反应器,研究过磷酸钙不同添加量对猪粪、米糠堆肥的保氮效果.[结果]添加过磷酸钙可促进堆温的提高,明显降低堆肥初期与高温期的pH,明显提高堆肥的水溶性NH4+-N含量,有效减少NH3的释放量,推迟NH3产生量的高峰期.与对照(CK)相比,添加1％、2％和3％过磷酸钙可分别降低堆肥氮损失率33.56％、49.18％和52.88％,提高堆肥的磷含量.[结论]猪粪、米糠堆肥的过磷酸钙适宜添加量为2％ ～3％.

Nitrogen Conservation of Calcium Superphosphate in Swine Manure Compost

[Objective] The research was conducted to reduce the nitrogen loss of co-composting of swine manure and rice bran.[Method] Static forced-aeration composting reactors were used to study the effects of calcium superphosphate on reducing nitrogen loss of co-composting of swine manure and rice bran.[Result]Calcium superphosphate could increase compost temperature,reduce pH obviously,increase the contents of soluble NH4+-N,reduce the amounts of NH3 emission and postpone the maximum period of NH3 emission.Compared to the control,1%,2% and 3% of calcium superphosphate could reduce nitrogen loss by 33.56%,49.18% and 52.88% respectively.Calcium superphosphate addition could also increase phosphorus contents of compost.[Conclusion] The optimized ratio of calcium superphosphate usage for composting was 2%-3%.