Dynamics of free living n2 -fixing and p-solubilizing microorganisms during composting and phospho composting of Urban solid waste

B. Raghavendra Rao¹ and D. Radhakrishna*²

¹Department of Biotechnology,Alva’s College, Moodbidri, Karnataka - 574 227 India.

²Department of Agricultural Microbiology,UAS,GKVK,Bangalore,Karnataka - 560 065 India.

ABSTRACT: An experiment was conducted to study the population dynamics of N2-fixers and P-Solubilizers during composting and phosphocomposting of urban solid waste. The results indicate that the populations were initially very low up to 30th day and increased thereafter. The population of both the microorganisms was high in phosphocomposting system during last stage compared to ordinary composting. There was significant difference in pH during composting of urban solid waste. Initially pH was acidic (6.61), later on there was increase in pH noticed up to 21st day and there after pH started decreasing. In ordinary composting system 21st day registered highest reducing sugar (8.64 mg /g dry weight) but phosphocompost registered highest reducing sugar on 7th day (9.86mg/g dry weight) .In phosphocomposting system there was considerable reduction in the reducing sugar content noticed.

KEYWORDS: Composting; Phosphocomposting; N2-fixers; P-Solubilizers

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