Synopsis This book has been sub-divided into eight relevant sections consisting of over sixteen review articles as substantial chapters related to: Environmental Stresses (over seven chapters); Molecular Physiology/Biology (two chapters); Physiological and Molecular Implications of Biofertilizer ‘The Physiotechnological Advancements (one substantial chapter); Iron Nutrition and Interactions in Plants (one substantial chapter); Nitrogen Metabolism (one substantial chapter); Molecular and Physiological Advances in Biological) Nitrogen Fixation (two chapters); Physiological Strategies for Sustainable Agriculture (one substantial chapter). Eminent scientists all over the globe have contributed these chapters, who have been actively engaged in an assortment of explicit areas of research with all-encompassing knowledge, time-honoured record of distinction and illustrious authorities. They have put into producing up-to-date reviews, which are duly evaluated by the respective Consulting Editors of international stature from India, U.K., U.S.A., Argentina, Australia, Germany, Spain, France, Portugal, Israel, and Morocco to reinforce the execution of the noble objective, tremendously indispensable in the new millennium.