الفهرس 
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Abstract
– soya – beans are newly introduced legumes in Egypt . It has been found that the nodulation of these plants is very low under Egyptian soils conditions that may affect atmospheric nitrogen fixation and consequently the yield of that important legume . This is because the specific rhizobia strains are laking in Egyptian soils .
This investigation is designed in three steps as follows :
1 . selection of the most efficient strain of R. japonicum to be used in inoculating soya-bean seeds before planting .