الفهرس 
INTRODUCTION
studies on azospirillumOnly 14 pages are availabe for public view
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Abstract
Series of pot and field experiments were undertaken during the seasons of 1989 to 1992 to evaluate the potential role of Azospirillum brasilense and/or Azotobacter chroococ¬cum inoculations and their effects on growth and yield parameters of wheat (cv. Sakha 69) and on the Mediterranean ricegrass, Oryzopsis coerulescens. The field experiments were executed in the Experimental Farm of the Facul ty of Agriculture, University of Assiut and the pot experiments were conducted in the screenhouse of the Soi Is and Water Department~ Assiut University.
The specific objectives of this investigation included:
(1) Test the response of wheat plants to inoculation with strains of Azospirillum, locally isolated from wheat and mai ze plants, and select the most effecti ve ones for use in pot and field experiments. The differential response of certain wheat cultivars to inoculation was also evaluated in screenhouse.
(2) Evaluate the response of wheat grown in the field under different N-fertilization rates (10 to 80 kg N/feddan, urea form) to inoculation wi th Azopsiri lla (mixed se¬lected strains) applied by different methods of inocu¬lation: seed treatment with peat carrier; seed soaking in broth cuI ture for 2-4 hrs before sowing i and soi 1 spraying of broth culture at the time of first irriga¬tion.
(3) Evaluate the response of the Mediterranean ricegrass to
,
inoculation with selected Azospirill urn strains under
irrigation with saline water of different salinity lev-
eIs (screenhouse st.udies).
Based on the specific objective(s) of each experiment,
the following growth and yield parameters were determined:
number of plant tillers, plant height, shoot weight (fresh
I I I I I I I I I I , , , ,
and dry), root weight (fresh and dry), % N (shoot), total
yield (straw and grains), % N (grains) and % N (straw). In
addition, MPN of bacteria in roots and nitrogenase activity.