Abstract:
In this study, the effect of raw material ratio on the efficiency and quality of aerobic composting of vegetable wastes were investigated by using the industrial airstream film. Three ratios (A=20∶60∶10∶0∶130∶0, B=30∶30∶10∶40∶80∶40, and C=20∶20∶20∶60∶60∶80) of raw materials from biomass of tomato, chili, eggplant, corn stalk, residues of needle mushroom substrates and pine sawdust were set up. The changes of physicochemical parameters including temperature, C/N, germination index, number of plant pathogenic microbes and plant growth promotion efficiency of the final products were determined. The results show that A which peaked at 61℃ had significantly faster and higher temperature records during the composting process. The germination index of seeds treated with A, B and C were 88.69%, 82.92% and 80.21%, respectively. During the composting process, the C/N in each treatment significantly decreased by 27.12%, 23.17% and 22.06% for A, B and C, respectively. The number of plant pathogenic microbes also dropped along with the composting maturation especially for that of A. The results from the field experiment show that use of A could significantly increase the yield of tomato by 20.06% compared to that of chemical fertilization. In conclusion, the tested three different raw material ratio of vegetable wastes could all be used for airstream film fermentation, among which composting with high ratio of needle mushroom substrates residues (namely A) showed the highest composting efficiency and quality.