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The stimulatory effect of Rhizobium leguminosarum on AM-fungi development and their impact on the growth of faba bean plants in presence of compost under low level of N and P fertilizers (50 and 33.3 %, respectively) in field experiment that performed in Ismailia Agricultural Research Station was investigated. As compared to control, there were significant differences observed between the treatments due to the application of mycorrhiza, Rhizobium and compost on the number and dry weight of nodulation, shoot length and dry weight, branches and pods number, seed weight and total yield, in addition to the biological activity in rhizosphere region through the determination of soil dehydrogenase and nodules nitrogenase enzymes as well as the root infection percent of mycorrhizal fungi and leaves pigment content. In the majority of cases, the application of mycorrhiza, Rhizobium along with compost resulted in increase in the shoot length and dry weight, nodule number and dry weight, weight of 100 seed, shoot NPK and seed protein as compared to the other tested treatments. Moreover, results indicated the possibility of reducing N and P fertilizers by 50 and 66.6 % respectively, of the recommended dose without affecting faba bean yield by the combination between mycorrhiza, Rhizobium and compost. So, more attention must be paid due to the utilization of bio-inoculants to crops to decrease costs and ecology pollutant.