Cluster bean (Cyamopsis tetragonoloba L.) is an important legume crop of India which can thrive well in adverse conditions. Despite of the fact that P is abundant in the soil it cannot be assessed by plants. Bacteria like rhizobium isolated from root nodules have potential to solublize the insoluble phosphorus. Thus, it plays a vital role in enhancing the phosphorus availability and overcoming phosphorus deficiency through its transformations into available form and thereby enhancing the agricultural productivity in a sustainable way. Soil samples were collected from the fields located at three districts of Haryana. Further isolation and characterization of rhizobial isolates was carried out in screen house and phosphorus soulbilization efficiency was measured. | Phosphate solubilization activity of rhizobial strains isolated from root nodule of cluster bean plant native to Indian soils
