الفهرس 
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Abstract
a green house experiment was carried out at sakha agricultural research station. the first part of this work aimed to evaluate the performance of rhizobium inoculation, n fertilizer and their interactions on : - (1) nodulation, (2) plant growth , (3) yield components and (4) chemical composition of faba bean. legume response to inoculant is measured as the increase in the yied of inoculated over the unionculated crop. maximum benefits of n2 fixation by legumes often requires the inoculation of selected strains of rhizbium in seed inoculants. the inoculant strain must be effective in its ability to fix n2 with cultivar concerned and posses the ability to compete for nodulation of the plant with other strains of rhizobia that might be present in the soil. therefore, the present study dealed with nodulalion and n2- fixation of faba bean crop. a pot experiment was designed to explore the efficiency of interaction of native rhizobia and two strains of rhizobiun leguminosarum bv. viceae . a split plot design with three replicates was couducted in this study *the main treatments : - nitrogen fertilizer rates at 0, 7. 5, 15, and 22. 5 kgn/fed as ammonium sulphate described as n0 , n1 , n2, n3 levels respectively. *sub main treatments ( inoculation trails ) 1- control ( without inoculation ). 2- liquiel culture of rhizobium strain 303 liquiel culture of rh. strain 317
4- rice straw co- compost carrier of rh. st. 303
5- rice straw co. compost carrier of rh. st. 317 ( rc- 317 )
6- commercial peat moss carrier of rh. st . 303
7- commercial peat moss carrier of rh. st . 317