الفهرس 
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Abstract
The present work aimed to evaluate the effectiveness of three rhizobacterial strains viz., Azospirillum brasilense AC1, Micrococcus roseus SW1 and Bacillus globisporus EF3 applied individually or in a mixture as biofertilizers for wheat at different levels (0, 50, 100% of the recommended levels) of mineral N and P fertilizers.
The obtained results can be summarized as follows :
1. All the bacterial inoculants caused significant reductions in the soil pH values. The lowest value was obtained at 50% fertilizer levels with B. globisporus EF3.
2. Level of the soil available N and P significantly increased with raising NP levels.
3. All the bacterial inoculants significantly increased the level of available N, P and Zn in the soil. The highest level of N and P was recorded at 100% NP levels with A. brasilense AC1.
4. All the rhizobacterial strains applied either separately or in a combination significantly increased grain and straw yields compared to the uninoculated control. B. globisporus EF3 proved to be the most efficient strain on grain and straw yields.
5. Seed inoculation with all rhizobacterial strains either individually or as a mixture significantly increased the uptake of N, P and K by plant. The highest concentration and uptake of N in grains were obtained at 100% NP levels with A. brasilense AC1.
6. The concentration of Fe, Mn, Zn and Cu in grains and straw was increased due to the inoculation with the tested rhizobacterial strains as compared to the uninoculated control.
7. The foregoing results indicate that the levels of NP mineral fertilizers currently applied for wheat in the sandy soils at Ismailia might be reduced by combination of B. globisporus EF3 inoculation plus 50% of the recommended ammonium sulfate and superphosphate fertilizer levels.
Keywords: seed inoculation , rhizobacteria ,mineral nutrition of wheat , nutrient availability in soil.