الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
I wish to express my deepest gratitude to Prof. Dr.
W . A . Mas h h o o r , and Pro £. Dr . M . E . E 1-Had dad
Microbiology Dept., Fac. of Agriculture, Ain Shams Univ.,
as well as to Prof. Dr. M.E. El-Sibaie, head of Soil Microbiology
Unit, Desert Research Institute for suggesting the
problem, supervision, guidance, keeping interest and progressive
criticism.
I am indebted. to Dr. M.E. El-Demerdash, Lecturer of
Agric. Microbiology, Fac. of Agriculture, Ain Shams Univ.
for his kind cooperation during the course of this work.
Thanks are also due to all members of Agric. Microbiology
Dept. Ain Shams University and of Soil Science
Dept., Desert Research Institute, for their help and
encouragement.
Grateful appreciation is extended to the authorities
of Desert Research Institute for the offered facilities.
To my husband and sons, I wis h to express my warmest
thanks for their patience, encouragement and assistance.