Agriculture is the most important sector of economy and employment in India. Today an increasing number of farmers and agriculturists are turning to the use of bio fertilizers to enhance the crop production as these are gentler on the soil as compared with the chemical fertilizers. Soil microorganisms play an important role in soil processes that determine plant productivity. In the present study, used microorganisms as bio fertilizer were Rhizobium and Phosphobacteria in which rhizobium fix atmospheric nitrogen whereas phosphobacteria solubilizes the insoluble phosphorous and converts it in soluble form to crop plants. Therefore, both activities are important for the growth and development of crop plants to enhance the crop yield. In this experiment used crop plant material was Black gram (Vignamungo L.Hepper) to observe certain morphological parameters such as germination percentage, plant height, fresh and dry weight of plants, number of pods per plant and seed yield per plant. The maximum values of all experimental parameters were reported with combination treatment of Rhizobium and Phosphobacteria. Therefore, it was concluded that the combination of beneficial microorganisms such as Rhizobium and Phosphobacteria might be an important factor to enhance the crop yield and also for achieving a sustainable agriculture in the future.
