10.22376/ijpbs.2019.10.1.p1-12 Volume 8 Issue 2 2017 (April - June) Agro-waste can be considered as an important source for biocomposting technology as it contains more nutrients compared to other organic wastes. Biocompost has significant quantities of macro and micro-nutrients and beneficial microorganism. Corncob and coir pith are major agro-industrial wastes in India which decompose very slowly due to the presence of high amount of lignin, cellulose and hemi-cellulose components. The present study was aimed to analyze changes in the microbial population during the composting of corncob and coir pith. Six kinds of composting experiments were carried out by using corncob and coir pith. Microbial population was studied at regular intervals of 0-30, 30-60 and 60-90 days in the composting unit C lessThan sub greaterThan 1 lessThan /sub greaterThan , C lessThan sub greaterThan 2 lessThan /sub greaterThan , C lessThan sub greaterThan 3 lessThan /sub greaterThan , C lessThan sub greaterThan 4 lessThan /sub greaterThan , C lessThan sub greaterThan 5 lessThan /sub greaterThan and C lessThan sub greaterThan 6 lessThan /sub greaterThan during the composting period. The present study concluded that combined application of coir pith, lessThan i greaterThan Pleurotus sajor-caju lessThan /i greaterThan and lessThan i greaterThan Eudrilus eugeniae - lessThan /i greaterThan treated compost (C lessThan sub greaterThan 6 lessThan /sub greaterThan ) is microbiologically more active than other worm un-treated substrates. G. SAKTHIVIGNESWARI AND A. VIJAYALAKSHMI Compost Pleurotus sajor-caju, Eudrilus eugeniae, corncob and coir pith. 679-685