Nutrient Dynamics in Blackgram (Vigna mungo) Grown Vertisols as Influenced by Co-inoculation of Different Bacterial Cultures with Rhizobium phaseoli

A field experiment was conducted during kharif season of 2018 at Research Farm, Department of Soil Science and Agricultural Chemistry, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani to assess the co-inoculation effect of different bacterial cultures with Rhizobium phaseoli on nutrient dynamics. Experiment consist of ten treatments in which eight pre-evaluated bacterial cultures in laboratory (Rhizobium phaseoli, Bacillus megaterium, Bacillus subtilis, Bacillus polymyxa, Pseudomonas striata, Pseudomonas flurescens, Azotobacter chroococcum and Azospirilllum lipoferum) and were used with recommended dose of fertilizer (RDF) in randomized block design. Seed treatment of black gram was done with bacterial cultures along with application RDF at the time of sowing. Results emerged out indicated that the both macronutrient and micronutrient mobilization were significantly improved by co-inoculation over non-inoculation and single inoculation of Rhizobium phaseoli. The co-inoculation of Rhizobium phaseoli + Bacillus megaterium, Rhizobium phaseoli + Pseudomonas striata and Rhizobium phaseoli + Pseudomonas flurescense were found to be at par with each other and having more potential than the other combinations in influencing soil nutrient availability.