الفهرس 
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Abstract
Acknowledgement
I wish to express my most sincere gratitude to Prof.
Dr. A.bmed Labibe Et-TCII1i 1 Professor o1’ Horticulture1 li’aculty
of Agricul ture1 Ain-shams University 1’or suggesting the
current study, his supervision, continuous guidance, kind
support, revision of the manuscript, and 1’ruit1’ul encouragement
•
Deep thanks are offered to Dr. Ahmed J4ontasser 1
Professor of Horticulture, Ain-Shams University for his
supervision, sincere help1 useful criticism during the
whole work and preparing this manuscript •
I would like to express my great thanks to Dr. Zeinab,
H. BehairJ 1 Associate Professor of Horticulture, Ain-Shams
University for her suggestion of the problem, sincere help,
guidance and valuable advice •
My sincere gratitude to Dr. M. A. Salama, Associate
Professor o1’ Horticulture, Cairo University, El-li’ayoum ,
for his advice, kindness and sincere help during the
preparation of this thesis •Thanks are sl.so dlle to all those whose Jc.ind help
made this work possible •