The book deals with the basic principles and practices of agronomy, history of agriculture, classification of crops, soils, tillage, cropping system and pattern, cropping and farming systems, nutrient management and organic farming. This book will be useful for gaining knowledge about the basic principles of agronomy and and also useful for students, teachers, scientists and professionals engaged in agricultural development. This book covered various chapters dealing with all aspects of basic principles of agronomy, which includes classification of crops, dryland agriculture and organic farming, etc.