Effect Of Exogenous Additives On The Process And Quality Of Green Waste Composting

The garden waste, which composted in the aerobic windrow composting way, was studied. In order to investigate the influence of four kinds of exogenous additives:rotten composting products, caw waste, trametes versicolor, compound microbial inoculum on the composting process and effect. We adopted the method of dynamic sampling, laboratory samples testing, combition of infrared spectroscopy technology and microbial plate counting to study the material decomposition, physico-chemical properties and the microbial growth and generation changes during the composting process. Taking the mixture of peat and aerobic composting product as the matrix of Calathca rotundifola cv. Fasciata and Asplenium nidus, we used both the physico-chemical index of the matrix and biomass index to study the influence of landscape wastes aerobic composting on the growth of Calathca rotundifola cv. Fasciata and Asplenium nidus seedings. Similarly, taking the mixture of peat, The earthworm composting product and aerobic composting product as the matrix of Brassica oleracea L. and Cucurbit a pepo L., we used both the physico-chemical index of the matrix and biomass index to study the influence of landscape wastes aerobic composting on the growth of Brassica oleracea L. and Cucurbita pepo L. seedings. The result indicates that:Based on the physical and chemical index and material variation of garden waste composting process, we could know that:each of the four kinds of exogenous additives could accelerate the increase of bacterias, boost the composting process by increase the material decomposition of the early stage and humus generation of the later stage and improve the quality of the compost. The effect of microbial inoculum was better than the rotten composting products and caw waste, while the effect varied with different exogenous additives. It was obvious that the compound microbial inoculum was more suitable than trametes versicolor for garden waste composting.The aerobiotic compost of garden waste contained smaller particles, total pore space and aeration porosity, and higher unit weight and nutritive element content. With the increase of the addition of garden waste compost, the component of the matrix gained an increase in unit weight and nutritive element content, and a decrease in total pore space and aeration porosity. The best effect was reached by 50% replacement of peat with garden aerobiotic compost in Calathca rotundifola cv. Fasciata, and 75% replacement of peat with garden aerobiotic compost in Asplenium nidus cultivation.Aerobic composting was with higher total pore space and aeration porosity. Earthworm composting was with lower total pore space and aeration porosity however better water holding pore and water-retaining property. Aerobic composting and Earthworm composting could both increase nutritive element content of the matrix. All the experimental treatment could be used as the matrix of high salt tolerance and high plant Brassica oleracea L. caltivation. Only the treatment of Earthworm composting and peat with the ratio of 1:1 could be used as the matrix of low salt tolerance Cucurbita pepo L. Plant.