Two field experirnents were carried out during 1999 and 2000 seasons at the Ex perimental Farm. Fac. of Agric. Moshtohor to study the effect of dual Inoculation with Bradyrhi:obium1aponim arid vesicular arbuscular ‘flycorrhjzae (VAM) Glَ flUls mossece in presence of either superphosphate or rock phosphate on the nodulation, N2-fi.Natiop, mycorrhizal root infection percentage, macro and micronut,ents content, growth and yield of soybean plants, Results of this study showed that dual inoculation with B. Japon kvm and VA-mvcorrjije increased the nodulatjon N2-ase activity, mycorrhjzal root infection percentage, plant growth and macro (NJ’ and K) and micronutrjents (Fe, Zn and Cu) contents of the plants compared to the application of each inoculu.m singularly, Application of rock phosphate rather than super phosphate increased the abovementioned Parameters Superplىospha application gave lower records of nodulation. N2-ase activity, Inyc -rhizai root infection com pared to rock phosphate application. Yield and yield components of soybean plants were significantly increased ،n treatments inoculated with either Bradt.rhj:ob lurn or VAM fungus as well as the combination of them and fertilized with rock phosphate compared to that inoculated and fertilized with Superpliosphate The highest records of prOtein and oil yield were observed ،n the treatment of dual inoculation and fer tilization with rock phosphate Therefore rock phosphate using combined with dual inoculation by Bradyrhizobjurn and Endomycofl-hjzae C3.fl be recommended as analtemathe for superphosphate to reduce the production costs of soybean.