过磷酸钙在猪粪堆肥过程中的保氮效果研究

Nitrogen Conservation of Calcium Superphosphate in Swine Manure Compost

[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%。

[Objective ] The research was conducted to reduce the nitrogen loss of co-composting of swine manure and rice bran. [ Method ] Static forced-aerhtion qomposting 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,l% ,2% and 3% of ca!c!um 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%.