Book excerpt: Principles of Organic Farming is a practical oriented text about organic crop management that provides background information as well as details of ecology-improving practices. This book is meant to give the reader a holistic appreciation of the principles and importance of organic farming and to suggest ecologically sound practices that help to develop and maintain sustainable agriculture. This book is intended as a professional basic textbook for undergraduate level students and will specifically meet the requirement of the students of organic farming being taught in all the agricultural universities across the globe. In addition, the purpose of this work is to spread the basic concepts of organic farming in order to; guide the production systems towards a sustainable agriculture and ecologically safe, obtain harmless products of higher quality, contribute to food security, generating income through the access to markets and improve working conditions of farmers and their neighborhoods. Note: T&F does not sell or distribute the hardback in India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka. This title is co-published with NIPA.