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To study the effects of woody peat as additive on the maturity and gaseous emissions(NH3,N2O and CH4)of during pig manure composting,an experiment of pig manure composting for 77 days was carried out.Pig manure composting with cornstalks as a control treatment,woody peat was used to compost pig manure under aerobic conditions in 1.2 m3 reactors.