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This study was performed to investigate the impacts of two indigenous strains of zinc (Zn) solubilizing bacteria on Zn fractionation in soil, Zn uptake, and the molar ratio of phytic acid to Zn (PA/Zn) in wheat grain cv. Chamran. The experiment was implemented in a completely randomized factorial design that included the treatment of bacterial inoculation consisting of B0 (control), B1 ( Bacillus megaterium ), B2 ( Enterobacter cloacae ), B3 (a mixed inoculation of both bacteria), and ZnSO 4  fertilizer at three application levels: Zn0 (control), Zn1 (5.1 mg kg −1 ), and Zn2 (10.2 mg kg −1 ).  Bacillus megaterium  was isolated from the rhizosphere of  Zea mays , which can solubilize Zn and phosphate and produce auxin.  Enterobacter cloacae , which had been isolated from sugarcane root, was screened qualitatively and determined to be the best isolate to solubilize Zn. The results indicated the maximum values of organically bound and exchangeable Zn in the Zn2B3 treatment. Also, the highest amounts of carbonate bound, FeMn-oxides, and residual fractions were recorded for the Zn2B0 treatment. The relative proportions of residual, FeMn-oxides, carbonate, organic, and exchangeable Zn fractions in Zn0B0 were 40.48, 29.2, 27.1, 2.18, and 0.84%, respectively. These proportions changed to 37.24, 29.51, 26.9, 4.3, and 1.75%, in the Zn0B3 treatment. Maximum values of Zn uptake and grain yield were associated with the Zn2B3 treatment, showing increases (compared to the control) of 214 and 46%, respectively. The lowest ratio of PA/Zn was obtained in the Zn2B3 and Zn2B2 treatments, which exhibited reductions of 31.38 and 30.86%, respectively, when compared to the control.

Changes in Soil Zinc Chemical Fractions and Improvements in Wheat Grain Quality in Response to Zinc Solubilizing Bacteria