Pot and root-box experiment of randomized block and split block design were conducted for determinating effects of P application and combined application of P and Fe²⁺ on growth of Caragana and its rhizospheric environment in calcareous soils with sufficient water supply.Results of the pot experiment show that caragaaa biomass increased with P application rate.Under the stress of low P or P deficiency,shoot growth of Caragana was restricted,the ratio of root/shoot increased and soil pH decreased rapidly.The root-box experiment demonstrates that effect of combined application of P and Fe²⁺ on Caragana biomass varied with the ratio.When the P and Fee+application rate was P₂0₅ 0.15 g kg^-1 and FeSO₄·7 H₂0 0.03 g kg^-1,respectively,an evident increase in Caragana biomass was observed over other treatments.The effect of combined application of P and Fe²⁺ on available P in the rhizosphere (0-6 mm) decreased rapidly with increasing distance,and was just in reverse on soil pH.Resups show that soil pH in the rhizosphere was mainly controlled by P application rate,and the application rate of Fe did not have much effect on soil pH in the rhizosphere or the root zone.