Agronomy is the field of science that takes into account a more holistic and integrated view of the agriculture and all the important fields related to it. It encompasses soil classification, crop rotation, irrigation and drainage, plant physiology, plant breeding, soil fertility, weed control, insect and pest control. Crop science on the other hand focuses on the effects of drought, water use efficiency, effect of temperatures on crops, mineral deficiency and toxicity stress and to reduce them. These are overlaping fields as they both concentrate on crops. This book attempts to understand the multiple branches that fall under the disciplines of agronomy and crop science and how such concepts have practical applications. The various studies that are constantly contributing towards advancing technologies and evolution of these fields are examined in detail. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included in this book. It will help the readers in keeping pace with the rapid changes in this field. It will serve as a reference to a broad spectrum of readers.