الفهرس 
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Abstract
The author wishes to express his deep gratitude and
sincere appreciation to late Prof. Dr. M.I. El-Ghawas,
Professor of Agronomy, Agronomy Department, Faculty of Agriculture,
Ain Shams University, who passed away on December,
1985 for suggesting the problem, his supervision, and
great help during the course of this study.
Special thanks and deep appreciation are also due to
Prof. Dr. K.A. El-Shouny, Professor of Agronomy and Dr. A.M.
Esmail, Associate Professor of Agronomy, Agronomy Department,
Faculty of Agriculture, Ain Shams University for their supervision,
valuable criticism, fruitful advice, and guidance
throughout the course of this study.