This book is mainly intended for the agronomy courses of graduate students in the field of Agriculture, Horticulture, Home science, Forestry and Agricultural Engineering. It is clear that young students are suffering from cultural shocks to shift from their environment. Semester system of education of B.Sc.(Ag.), B.Sc.(Horti.), B.Sc.(Home Science), B.Sc.(Forestry) and B.Tech.(Ag. Engg.), students are quite dynamic for which the students are to be helped for changeover. We can identify their difficulties for comprehensation of language, non-availability of textbooks for their semester system. There is a need to use simple language. The present book titled “A Text book of Agronomy” suite to the need of students. This book is written in simple understandable language dealing with various subject matters of agronomy. In general, the courses dealt to the graduate students are principles of agronomy, agricultural heritage of India, agricultural meteorology, principles of weed science, irrigation management, dry farming, agronomy of field crops and biofuel crops. This book has been prepared with a specific purpose of importing complete comprehensive information about agronomy and we hope that the students and readers will find this with much utility. We thank all the authors / publishers from which references were collected on various aspects of agronomical aspects.