الفهرس 
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Abstract
· J’ he \.,, r· i t e r w i shes t o ex p r e s s h i s cl e e pes t a p pre c i at i on
and ratitt1de to Professor Dr. Olfat, H. El-Bagoury, Prof.
of Agronomy, Faculty of Agriculture, Ain Shams University,
for hPr StlpPrvision, valuahle advice, helpful suggestions,
constructive criticism and encouragement throughout the investigation
and during the preparation the manuscript.
Thanks are also extended to Professor Dr . M., A. ,Ashoub,
Prof., of Agronomy, Faculty of Agriculture, Ain Shams Univ.,
for his help in all pro blems, supervision, support, and
helpful assistance in writing the dissertation.
The writ e r wishes also to express his deepest gratitude
to Dr . A.S. Edris, Associate Professor of Agronomy, Faculty
of Agriculture, Ain Shams University for his fathful assistance,
generous help and precious advice during the progress
of this work.
Hearty and greatful thanks are extended to Dr . M. S.
El-Hab. al, Associate Professor of Agronomy, Faculty of
Agricultur e , Ain Shams University for this every possible
guidance he kindly offered.
Great thanks are also to my mother and my wife for
their encouragement throughout the investigations .