Preparation of phosphocompost was carried out at Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar, West Bengal during two consecutive years 2007 and 2008 with four levels of P through Udaipur rock phosphate and two levels of microbial inoculums as treatments by using wheat straw, fresh cow dung and the mixed green biomass of weed Polygonum spp. and Micania micrantha in the ratio of 7: 2: 1 on dry weight basis. The experiment was laid out in a Completely Randomized Design with three replications. pH of the phosphocompost increased significantly with the increase in level of P from 2.5% to 7.5%. Percentage of total organic carbon, total nitrogen and total potash significantly and consistently decreased with the increase in rock phosphate levels of 2.5%, 5% and 7.5% over the control at all stages of composting. Inoculation with locally isolated PSB and Trichoderma viride significantly increased pH, total nitrogen, phosphorus and organic carbon of the compost. The C: N ratio exhibited a decreasing trend with the increase in rock phosphate level and with the microbial inoculation at subsequent stages of decomposition.