Agriculture is a broad subject. It covers all the basic subjects of science. Therefore students have to pass through all the agriculture related subjects with elementary courses during under graduation. After passing graduation, higher degrees are done in specialized field of Agriculture so there is no need to read all Agriculture subjects in M. Sc. and Ph. D. But for the preparation of various agriculture competition examinations students have to read all the basic books of Agriculture to cover syllabus. That time most of students don′t have all the necessary books and too much time to read them. Therefore to overcome these problems the authors tried their best to write this book through reading various books and other sources of Agriculture to cover brief and best information of subjects (Agronomy, Genetics and Plant Breeding, Soil Science and Agricultural Chemistry, Agricultural Microbiology, Physiology, Agricultural Entomology, Plant Pathology, Horticulture, Agricultural Economics, Agricultural Extension And Agricultural Statistics) in one book. Broadly covering these ten subjects of Agriculture in one book is very hard task in brief manner. So some unknown mistakes may be left, therefore your suggestions are invited to further improvement of this book. But authors would like to say that students have to treat this book as a competitive book not a text book for various degree courses of Agriculture.