Phosphorus is present in soil in various forms, including as insoluble organic compounds. Many species of soil-dwelling microorganisms release phosphorus from compounds that are sparingly soluble and make it partially available to crop plants. This group of microorganisms includes phosphate-solubilizing bacteria (PSB) that release phosphorus from relatively insoluble forms by producing organic acids, mineral acids, siderophores, CO₂ and H₂S. The ability of Pseudomonas sp. SP0113 to solubilize tricalcium phosphate and its influence on the development of spring wheat was determined in this study. Solubilization of tricalcium phosphate (TCP) was evaluated based on changes in the pH of the NBRIP (National Botanical Research Institute’s) phosphate growth medium. pH and redox potential were measured immediately after the addition of TCP and every 24 hours. Pseudomonas sp. SP0113 proliferated in culture media with pH lower than 7, which indicates that the evaluated strain can be used as plant-growth promoting bacteria (PGPB) in acidic soils. Seed dressing improved the biometric parameters of spring wheat. The applied bacterial strain was capable of solubilizing phosphates. Spring wheat treated with Pseudomonas sp. SP0113 was characterized by higher thousand grain weight, kernel yield higher by 7.5%, longer spikes and stems, and a lower dry matter content in comparison with control.
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