Processing of different types of organic wastes through vermicomposting

In the present study, an effort has been made to utilize different types of organic wastes, i.e. kitchen waste, agro residue, institutional waste and cow dung through the process of vermicomposting. These organic wastes were collected separately, air dried, grinded and mixed in 4:1 ratio with cow dung (w/w). During the period of vermicomposting (75 days), different physico-chemical parameters were analyzed separately. During this process, pH, organic carbon, organic matter and C:N ratio of different organic waste mixtures showed a declining trend, however, total nitrogen, available phosphorus and exchangeable potassium contents showed increasing trend with the advancement of vermicomposting period. Besides, physico-chemical investigations of these wastes, estimation of earthworm population, biomass and number of cocoon produced during vermicomposting were also analyzed separately. It was found that earthworm population, biomass and cocoon production increased significantly as the duration of vermicomposting process increased upto 75 days.