论文部分内容阅读
The study was conducted to reveal P fractions and N forms changing characters during composting of pig manure with rice straw.During composting,the NH 4 +-N concentration decreased and reached at a relatively low value(<400 mg kg-1) in the final compost,while the NO 3--N concentration increased.Total N losses mainly occurred during thermophilic phase due to the high temperature,the high NH 4 +-N concentration and the increase of pH value.Labile inorganic P was dominated in the pig manure and initial compost mixture.During composting,the proportion of labile inorganic P of total extracted P decreased,while the proportion of Fe+Al-bound P,Ca+Mg-bound P and residual P increased.The evolutions of the proportion of labile inorganic P,Fe+Al-bound P and Ca+Mg-bound P were well correlated with the changes of pH value,organic matter and C/N ratio.Therefore,composting could increase the concentration of N and P and decrease the presence of NH 4 +-N and labile P fractions which might cause environmental issues following land application.
The study was conducted to reveal P fractions and N forms changing characters during composting of pig manure with rice straw. Fluid composting, the NH 4 + -N concentration decreased and reached at a relatively low value (<400 mg kg -1) in the final compost, while the NO 3 - N concentration increased. Total N losses mainly occurred during thermophilic phase due to the high temperature, the high NH 4 + -N concentration and the increase of pH value. Labile inorganic P was dominated in the pig manure and initial compost mixture. During composting, the proportion of labile inorganic P of total extracted P decreased, while the proportion of Fe + Al-bound P, Ca + Mg-bound P and residual P increased. evolutions of the proportion of labile inorganic P, Fe + Al-bound P and Ca + Mg-bound P were well correlated with the changes of pH value, organic matter and C / N ratio. Beforefore, composting could increase the concentration of N and P and decrease the presence of NH 4 + -N and labile P fractions which might cause enviro nmental issues following land application.