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Abstract
Soil salinity is one of the most important environmental factors affecting the growth and yield of most field crops such as legumes and effect on soil fertility and soil microbial populations especially the microorganisms which can symbiotically fix air nitrogen with legumes, therefore the aim of the present study was to isolate efficient nitrogen fixing Rhizobium isolates from different saline locations in Kafr El-Sheikh governorate, in vitro and in vivo evaluation of their salinity tolerance.