This book is intended for the agronomy and soil science courses of graduate and post graduate students in the field of Agriculture and Horticulture. This book has been prepared with a specific purpose of importing complete comprehensive information about soil fertility and nutrient management. I hope that the students and readers will find this with much utility. I thank all the authors / publishers from which references were collected on various aspects of soil fertility and nutrient management aspects. I am sure that this book will be useful to the students of agricultural universities.