Effects of pigs manure on high temperature compost maturity of tobacco fine waste.

Swine manure contains high content of nitrogen,which is a cheap and good nitrogen source.High temperature composting experiments were carried out to evaluate the effect of swine manure on tobacco fine waste composting processes and maturity and its optimal formula for the compost.The experiment design consisted of 4 treatments with 10:0,9:1,8:2 and 7:3 ratio of tobacco fine waste and swine manure.The dynamical changes of temperature,the contents of total-nitrogen(T-N)and water-soluble ammonium(NH4+-N),carbon(C)/N ratio,seed germination index(GI)in the composting process of the different composting treatments were measured periodically.The results showed that adding swine manure shortened the time of reaching high temperature(50 ℃)and extended the high temperature sustaining time;increased total-N and GI,accelerated the reduction rate of NH4+-N,C/N ratio and the composting process and maturity.The highest temperatures were 43 ℃ and 58 ℃,60 ℃,52 ℃ in pure tobacco fine compost and the compost with swine manure treatments,respectively.The times of reaching high temperature(50 ℃)in the compost treatments of adding swine manure(9:1～7:3 ratio)were 3 d,4 d and 5 d,respectively and the high temperature decomposing durations were 11 d,10 d and 8 d,respectively.After 26 days,the NH4+-N contents in the compost treatments with swine manure were decreased by 47.7%,61.9% and 25.6% compared to the pure tobacco fine compost treatment,and the GI reached 81.4%,84.1% and 83.7%,respectively.