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Abstract Studies on Root-Associated Ntrogen- Fixing Azospirillum Species and The effect of their inoculation on growth,nitrogen yield and some physiological changes of two cereals (maize and wheat) in El-Minia governorate br Results of the present study revealed the abundance of the n2-fixing azospirillum spp. in the tested root-free and rhizosher-soil samples collected from el-minia governorate, upper egypt, in maize, wheat and sugar-cane cultivations. |