Precomposting and green manure amendment for effective vermitransformation of hazardous coir industrial waste into enriched vermicompost

초록

Vermitransformation of coir pith (CP) into enriched vermifertilizer has been achieved by amending a green manure plant, Sesbania sesban (SS) for the first time, and cow dung (CD) in five different combinations: T1((1:0:1)), T2((4:3:3)), T3((5:3:2)), T4((5:4:1)) and T5((1:1:0)). The substrates were 28 days precomposted with Pleurotus sajorcaju followed by 50 days vermicomposting with Eisenia fetida and Eudrilus eugeniae. Results showed a significant reduction in cellulose, lignin, organic carbon, C/N ratio, C/P ratio and an increase in plant nutrients compared to control. The fertilization index and efficiency of nutrient recovery rate were higher in SS and CD amended CP vermicompost, with a maximum in T2((4:3:3)) for E. fetida and T3((5:3:2)) for E. eugeniae. The activity of dehydrogenase, urease and cellulase, and phytotoxicity assays further revealed vermicompost stability. The study concludes that T2((4:3:3)) and T3((5:3:2)) combinations respectively for E. fetida and E. eugeniae is suitable for vermitransformation of CP into enriched vermicompost.

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