Phosphate Rich Organic Manure (PROM) is value added product produced by co - composting high - grade rock phosphate in fine size with organic matter collected from various sources such as FYM, straw of paddy or wheat, pressmud, karanj cake or waste from fruit industries and distillery etc. Phosphate Solubilizing Bacteria (PSB) and nitrogen fixing bacteria are added to improve the efficiency. The present book gives a comprehensive view of various aspects of PROM technology such as size reduction and granulometry of minerals, various routes of PROM making, microorganisms involved in PROM technology, analysis of PROM and soil, field experiments, statistical methods for their evaluation, PROM standards and sources of supply of PROM inputs. It is hoped that the book will be helpful to farmers, crop scientists, industrialists, environmentalists and person interested in PROM making as they will get all the needed information complied at one place.