Effects of Bacillus Megatherium Y2 on Maturity and Nitrogen Transformation during Pig Manure Composting
To facilitate the composting of pig manure and reduce nitrogen loss,an aerobic composting experiment was conducted with three treatments:a control group without inoculant(CK),and two inocu-lated groups with 3％(T1)and 5％(T2)of Bacillus subtilis Y2.Changes in maturity indicators,forms of nitrogen content,and ammonia volatilization rates were monitored during the composting process.The re-sults indicate that,compared to the control group,the addition of Y2 inoculant accelerated the onset of the high-temperature phase by 2 days and extended the duration of high temperatures by 3 days.It effectively lowered the pH and electrical conductivity(EC)values during the composting process,improved the seed germination index(GI),accelerated composting progress,and reduced the composting cycle.The addition of Y2 bacterial agent significantly increased the NH4+-N and NO3--N contents throughout the compos-ting.At the end of the composting process,compared to the control group,the NH4+-N contents in treat-ment groups T1 and T2 increased by 14.4％and 13.5％,respectively,while NO3--N contents increased by 34.8％and 38.7％.Furthermore,the addition of Y2 inoculant significantly reduced ammonia(NH3)emis-sions during composting,with maximum releases in T1 and T2 decreased by 14.6％and 17.9％,respec-tively,compared to the control group.In comparison to the initial stage of composting,the total nitrogen increases were 9.7％for the control group,21.7％for T1,and 21.9％for T2,indicating the effective ni-trogen-fixing capacity of the Y2 inoculant.These findings demonstrate that the Y2 inoculant is effective in promoting compost maturity,inhibiting ammonia volatilization,and reducing nitrogen loss.
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