Agriculture is the largest sector of Pakistan economy and major driving force for the growth of national economy. Improvement in crop production will not only help the economy of Pakistan but will also benefit a large portion of country's population. This book provides the fundamental knowledge about the role of crop rotation and crop residues managment in improvement of soil N & C dynamics and its impact on cereal yield. The low soil fertility is one of the serious problem of field crop production in different regions of the world. This book provides valuable information for the agricultural graduates, researchers, faculty and development oragnizations engaged in boosting of crop yield. The book explians the importance of legume crops and cropping systems to reduce the reliance on chemical fertilizers for high cereal yield.