The present publication encompasses a comprehensive examination of the concepts and significance of organic agriculture across sixteen chapters. These chapters encompass foundational information on biofertilizers, their classification, nitrogen fixation, and various microorganisms, including Rhizobium, Azolla, Azotobacter, Azospirillum, blue-green algae, phosphorus solubilizing microorganisms, Mycorrhizae, Frankia, vermiculture and vermicomposting, liquid biofertilizers, and various media. The text has been written in a lucid, straightforward manner, utilizing up-to-date data and statistics. The references for each chapter have been provided at the end of the book and are intended to be of great utility. This book is an inclusive, fundamental textbook on organic farming systems and is designed to meet the requirements of scientists, educators, research scholars, and students residing in both urban and rural areas.