This book has been designed to cover the course of graduate and Post-graduate levels of various Indian Agricultural and general Universities. It also covers the syllabus of Agricultural Research Services Examination and National Eligibility Test conducted by the Indian Council of Agricultural Research, New Delhi. This book also helpful to the scientists and academicians those who are engage in agricultural research in India. Hopeful this book also helpful to the students those are engage to preparation of competitive examinational related to agriculture.