Bio-fertilizer are generally bio-organic substance that have capability to improve the soil fertility significantly by fixing atmospheric nitrogen both in isolation with or without plant root. These can solubilize insoluble phosphate and produce plant growth hormone (auxin, indolacitic acid). Fixation of atmospheric nitrogen in to the soil is followed by three categories (a) Natural N2 fixation (2) chemical N2 fixation (3) biological N2 fixation. In present investigation, an attempt has been carried out for screening diazotrophic bacteria from saline desert soil. The isolates were further...