Principles of Organic Farmingcomprises several valuable chapters like organic versus inorganic agriculture, organic farmingorganic nutrient resources and their fortification, growth promoting microorganisms, vermicomposting, quality analysis, grading, packaging, biofertilizers, national programme on organic products, certification processes, zero budget natural farming and manymore important topics. Sustainable agriculture is implemented only when converting our chemical based agricultural system into organic based farming system. The book is framed on organic farming courses of various agricultural universities. It deals with the landmarks in the field of sustainable agriculture and organic farming. Greenmanuring, soil improvement and amendments, biofertilizers, weed management, bio-pesticides, certification process etc. At the end of each chapter, there is an important question series designed to provoke individual thought and critical examination of their memory to increase the conceptual and analytical view of a particular chapters.