Utilization of Waste Tobacco Stem and Chicken Manure by Aerobic Composting

The composting effects of waste tobacco stems mixed with chicken manure were studied, which will provide a new way to rationally use waste tobacco stems and chicken manure, and could also reduce non-point source pollution caused by agricultural and poultry wastes and increase circular use of agricultural wastes. The results indicated that the treatment temperature of tobacco stems composted with chicken manure(treatment A)exceeded 50 ℃ for 10 days, and that of tobacco stems composted with ammonium bicarbonate(treatment B)exceeded 50 ℃ only for 2 days in the composting process. The harmful bacteria in treatment A could be eliminated easily. On the 30th day of compost- ing, the carbon contents of treatment A remained basically stable and the rate of C/N and NH 4+ -N/NO3- -N were 15.8 and 0.43 respectively, but those of treatment B were still changeable and C/N and NH4+-N/NO3--N rate were 23.5 and 0.60 respectively. The Germination Index(GI) of radish seed in solution lixiviated from treatment A was 15% higher than that extracted from treatment B, and their difference was greatly significant on the 20th day of composting. The GI of radish seed in extracting solution from both treatment A and B reached 100% and was not significantly different on the 50th day of composting, which indicated the poison contents in composting products decreased to safety range. The contents of organic matter, total nutrients(N, P2O5, K2O)and heavy metals(As, Hg, Pb,Cd,Cr)in the composting product of tobacco stems and chicken manure conformed to the standard of organic manure quality.