الفهرس 
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Abstract
ACKNCNILEDGEJIENT ---------------
The author is deeply grateful to Prof. Dr. m.ElSawy,
Professor and Head of Agric. Microbiology Dept.,
Fac. of Agric., Ain Shams Univ. and Dr. M.A. El- Borollosy,
Assoc. Professor of Agric. Microbiology in the same Faculty,
for their supervision, helpful guidance and progressive
criticism.
The author also wishes to express his deepest gratitude
to Prof. Dr. M.N. Alaa El- Din, Head of Research of
Agric. Microbiology and Head of the BNF Unit, Soils and
Water Research Institute (SWRI), Agric. Res. Center (ARC),
for his supervision, guidance, constructive suggestions
and encouragement during the course of this work.
Thanks are also due to all members of the Dept. of
Agric. Microbiology, Soils and Water Research Institute ,
Agric. Res. Center, especially to colleagues in the BNF
Unit for their encouragement and sincere help.