Abstract: In a laboratory incubation experiment,factors affecting vermicomposting of agricultural organic wastes were optimized,and vermicomposting conducted under the condition combining all the optimized factors.And then the resultant compost was analyzed for variation of its major properties.Results show that with vermicomposting going on,pH value and C/N ratio of the wastes decreased but EC content increased significantly;available N,available P in the organic wastes reached the highest in content on D45,and available K reached the highest in content on D30;activities of sucrase,urease and catalase increased but phosphatase activity decreased in the initial period of vermicomposting.Moreover,compared with the vermicompost of mixture of pig dung and rice straw(7∶3 in ratio,15 ℃in temperature,75% in humidity and 10 worms/pot in inoculation density),the vermicompost of pig dung and sawdust(7∶3 in ratio,20 ℃in temperature,75% in humidity and 15 worms/pot in inoculation density) was relatively lower in pH,EC and available K,but relatively higher in the activity of sucrase and phosphatase.Relatively speaking,vermicomposting of the mixture of pig dung and sawdust is an effective approach to safe recycling of agricultural organic waste.

Key words: agricultural organic waste, earthworm, earthworm vermicompost