Book excerpt: Agronomy is such science of agriculture as encompassing all the branches of it. The main focus of agriculture is also agronomy. Therefore the soul of agriculture is agronomy and its knowledge is essential at all levels and intensity. The book is best suited to those students preparing for competitive exams such as JRF, SRF, IARI entrance exam, civil services, ARS and host of other exam being conducted by the Universities in agronomy. Hope that the book will be of immense benefit to all those users aiming to further their career in agronomy.