As globally we are running form high demand of productivity in agriculture with presently law farming land we have to strengthen our ability for more yield in crop generation.For that microorganisms can help by producing and providing plant hormones to enhance over all growth of plant.Microbial production of phytohormones (IAA, GA) that influence the plant growth activity. It can make the agricultural practice economically viable and sustainable in the future.This book contains original research work carried out by the author for the part of M.Phil program.Authors are thankful to Gujarat Vidyapith, Sadra for providing research facilities and environment.