[en] pot experiments were carried out with chickpea and wheat plants that cultivated in virgin sandy soil. the plants were inoculated with rhizobium and/or arbuscular mycorrhizae. nitrogen and phosphorus fertilizers were applied in three different levels. shoot dry matter accumulation, seeds and grains yields, nitrogen and phosphorus uptake were positively affected by inoculation and fertilization levels. N¹⁵-isotope dilution technique were used to determine the contribution of fertilizer,soil and atmospheric N uptake by shoot and seed or grain of both plants . soil microbial biomass C, N and P under chickpea and wheat at each treatment were investigated . Best results were mostly obtained in response to dual inoculation with highest experimental levels of N and P fertilizers