Study On The Vermicomposting Of Agricultural Wastes By Earthworm

Earthworms play a great role in recycling of organics and system balance in naturalland ecosystem. Since vermicomposting transform the organic waste to availablemanure by interaction of microorganisms and earthworms, it is regarded such antechnical with social, economic and environmental significance.Using different combination of composted cow manure, composted anduncomposted rice straw, the dissertation conducted decomposition in lab. The factorsthat affected on growth and reproduction of earthworms was analyzed. The content oftotal nitrogen, total phosphor, available phosphor, available nitrogen, organic carbonand C/N in composted and uncomposted cow manure was analyzed. The differentcombination of composted cow manure, composted and uncomposted rice straw, wasanalyzed. The function of earthworms in decomposition of two kinds of agriculturalwastes was discussion.The results were as follows:1) The earthworms grown and reproduced well in different combination of compostedcow manure, composted and uncomposted rice straw. The best state were in thecontent of composted cow manure in60%-70%.2) Characteristics of cattle manure were studied after vermicomposting for40d, usingthe raw uncomposted cattle manure without earthworm and natural compostingcattle manure as controls. The earthworms increased significantly the content ofmineral nitrogen and available phosphorus, promoted the activity of alkalinepotassium. Compared with natural composting without earthworm, vermicompostingsignificantly increased the content of mineral nitrogen and available potassium.3) Characteristics of the mixture with different composted cattle manure, compostedand uncomposted rice straw were studied after vermicomposting for40d, using thecomposted cattle manure without earthworm as controls. Difference or content oravailable nitrogen, total phosphorus, total nitrogen, available phosphorus, organiccarbon and C/N are not significant. In control groups, Total nitrogen, availablenitrogen, total phosphor, available phosphor and C/N in different combination of twokinds of agricultural wasted decreased with the decrease of content of compostedcow manure in combination., while the changes of available carbon were contrary to those characterizes. After conduction of earthworms, content of total nitrogen, totalphosphor, available nitrogen, available phosphor, organic carbon and C/Nsomewhat increased compared with the control groups. The action of growth andmetabolize of earthworms in cow manure, enhanced the fertility of cow manure asan organic fertilizer by advancing the stabilization of cow manure.