This book entitled, “Principles and Practices of Organic Farming” is written to serve a text book of Agronomy-cum-reference/guide book for the students of agriculture, veterinary, soil conservation and field practitioners. The book fills the need for an up-to-date comprehensive text on organic farming for sustainable agriculture under varying situations and covers comprehensively the content of the courses of Soil Fertility Management on Crop Production, Organic Farming for Sustainable Agriculture and Farming Systems in Agronomy offered for the students at under graduate and post graduate levels of Agricultural universities in the country.  This book will be of immense use in imparting knowledge on the basic principles of Soil Fertility Management on Crop Production and applied aspects of Integrated Farming Systems for students, teachers, scientists, extension workers and professionals engaged in agricultural development.