Abstract: Byproduct from hogwash was treated by vermicomposting with different volume proportion （0,10%,20%,30%,40%,50%） of rice straws as amendments firstly,and then the evaluation index system was established with Total N（TN） content,total P（TP） content,total K（TK） content,catalase （CAT） activity,plant height,leaf area index,root length,dry weight and fresh weight of plant as evaluation indexes. Factor analysis combined with gray correlation model was employed to evaluate the fertilizer effect of byproduct from hogwash. The results indicated that the fertilizer effect of byproduct from hogwash had been fluctuating between level Ⅲ or level Ⅳ without obviously change when rice straws were added to 0~30%,while fertilizer effect was increased to levelⅠwith 40% rice straws content. However,the fertilizer effect was decreased to levelⅡ when the addition of rice straws continued to increase to 50%. The results concluded that when 40% of rice straws as amendments,fertilizer effect of byproduct from hogwash reached the best performance.

Key words: vermicomposting technology, hogwash waste, rice straws, factor analysis, gray correlation model, fertilizer effect