The present study was carried during the period 2013-14 at the Department of Soil Science & Agricultural Chemistry, College of Agriculture, Vellayani. Samples of water cabbage (L. flava), coir pith, water hyacinth (E. crassipes), and farm wastes (dried leaves and pseudostem of banana) were collected were converted to composts using various inoculants viz., T. reesei, P. sajor-caju, Composting Inoculum and commercial enzyme cocktail (cellulase/pectinase and lactase). A mixture of water cabbage and Composting Inoculum was concluded as the best in terms of nitrogen content, phosphorus and potassium content, dehydorgenase activity, and no detectable levels of heavy metals.The resultant composts from the previous stage were evaluated for their performance as manure in a pot culture experiment with test crop amaranthus (variety – Arun and it was inferred from the study that water cabbage was the best substrate in terms of their chemical composition followed by water hyacinth. With regard to inoculants used on different substrates,Composting Inoculum was found to be the most effective for composting the agrowastes.