Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 12, Issue 10, Pages 1855-1864Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(13)60400-1
Keywords
composting; nitrogen forms; phosphorus fractions; organic matter; pig manure
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Funding
- Major Science and Technology Program for Water Pollution Control and Treatment [2012ZX07201004]
- Jilin Provincial Research Foundation for Basic Research, China [201105033]
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The study was conducted to reveal P fractions and N forms changing characters during composting of pig manure with rice straw. During composting, the NH4+-N concentration decreased and reached at a relatively low value (<400 mg kg(-1)) in the final compost, while the NO3--N concentration increased. Total N losses mainly occurred during thermophilic phase due to the high temperature, the high NH4+-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 NH4+-N and labile P fractions which might cause environmental issues following land application.
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