Maize, wheat, faba bean and soy bean are very important field crops in Egypt. Recently in this context, a national trend accompanied by a controversial discussion about factors affecting the growth and yields of those valuable crops has been focused. To meet the purpose described, some extensive researches have been carried out. The main objective of those studies were extensively investigated the potential factors affecting the highlighted crops production. The present book was illustrated and reviewed mainly not only the obtained results of original scientific researches but also the related scientific and practical work in mentioned topics. Whereas, the presented experiments and its real results were conducted in the research and agricultural experiments station at Faculty of Agriculture, Banha University, Egypt.