Effect of two microbial agents on tobacco fine waste high-temperature compost maturity.

High temperature composting experiments were conducted using mixtures of tobacco fine waste and swine waste to study the effects of two microbial agents,NNY and FB,on composing process and maturity.The dynamical changes of temperature,the contents of total-nitrogen(N)and ammonium(NH4+)-N,carbon(C)/N ratio,seed germination index(GI)in the composting process and the compost qualities of the different composting treatments with and without microbial agents were measured.The results showed that,adding microbial agents NNY and FB in tobacco fine waste compost shortened the time of reaching high temperature(50 ℃)and extended the high temperature sustaining time;increased the content of total-N,promoted the reduction rate of C/N ratio and NH4+-N,increased the GI,accelerated the composting process and maturity.In the control treatment of tobacco fine waste composting without microbial agent,the highest temperature and GI were 43 ℃ and 78.4%,respectively.In the composting treatments with microbial agents NNY and FB,the time of reaching high temperature(50 ℃) were 2 days and the duration of high temperature decomposing were 15 days and 12 days,respectively.Compared with the tobacco fine waste composting treatment with same ratio of swine waste,the time of reach high temperature in the treatments of microbial agents shortened by 2 days and the sustaining time of high temperature extended by 5 days and 2 days,respectively.After 11 days,the GI of the NNY and FB treatments was 185% and 117.7% higher than that of the tobacco fine waste treatment;and 41.4% and 7.6% higher than that of the tobacco fine waste compost treatment with the same ratio of swine waste,respectively.At the maturity,it was found that the composting treatments with microbial agents NNY and FB,had higher contents of total-N,total-P and total-K,higher total porosity and water-holding porosity,and lower the bulk density,compared with the tobacco fine waste treatment and the tobacco fine waste compost treatment with the same ratio of swine waste,improved the compost quality significantly.The accelerating effect of NNY on tobacco fine waste composting process was better than that of FB.