ACKNOWLEDGMENT First of all, I would like to pray to ALLAH, for helping me to finsih this work. I would like to express my deepest gratitude and sincere appreciation to Prof. Dr. A. M. Abou-Salama, Agronomy Department, Faculty of Agriculture, Assiut University for his supervision, planning the present study, valuable advice and encouragement during whole course of study. Great thanks to Prof. Dr. E. A. Teama, Head of Agronomy Department, Faculty of Agriculture, Assiut University, for helping me and encouragement. Also, great thanks to Prof. Dr. A. Z. Ahmed, Head Research and Vice-Dean of Sugar Crops Research Institute, ARC, Giza. for helping me in solving the problems which I faced. Deep thanks to all staff members of Agronomy Department Faculty of Agriculture, Assiut University, for their help and encouragement. Many thanks are also due to all stuff of El-Mataana, Agricultural Research Station, and Giza Sugar Crops Research Institute, Agricultural Research Center for their valuable assistance through this study. Finally, words can not express the feeding of appreciation and sacrifices of my parents, my brothers, my wife, my son Asem and Hafsa in their giving verity and patient for me to study and finish my thesis.
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