Abstract

                                A field experiment was conducted in red lateritic soil during Kharif seasons of 1993 and 1994 to study the cumulative agronomic effectiveness of various organic sources with Mussoorie rock phosphate on phosphorus economy in green gram under rainfed condition. Use of Mussoorie rock phosphate (MRP) alone could not increase the grain yield significnatly. But its efficiency was increased by mixing with organic sources viz., farm yard manure (FYM), enriched bio-digested slurry (BDS) and phosphobacteria inoculation. Application of MRP with seed inoculation of phosphobacteria and enriched BDS alone gave the highest benefit whereas, single super phosphate (SSP) alone was uneconomical under rainfed conditions.

Key words : Mussoorie rock phosphate, organic sources, enriched bio-digested slurry, Phosphobacteria