ArticleFrontiers in microbiology2026
Development of organo-bioformulations for improved phosphorus availability and wheat productivity: insights from adsorption isotherms and field validation.
Article in Frontiers in microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Low phosphorus (P) availability is a major constraint to crop productivity in calcareous soils due to higher P sorption and fixation processes. In these soils, applied phosphorus (P) is rapidly immobilized through precipitation with calcium and adsorption onto CaCO₃ surfaces, resulting in low P availability. Therefore, to mitigate this issue, the current research is focused on the development of organo-bioformulation and quantifying P sorption from diammonium phosphate (DAP) and organo-bioformulations to estimate the fertilizer requirement to maintain an optimal soil solution P concentration. Methods: Phosphate-solubilizing bacteria (PSB) were isolated from wheat rhizosphere soil collected from drought-prone regions of South Punjab. The isolates were characterized for plant growth-promoting traits and demonstrated high efficiency in solubilizing tricalcium phosphate (TCP) (up to 448 μg/mL), along with production of plant growth regulators such as indole-3-acetic acid (IAA) (up to 402 μg/mL), organic acids, siderophores, ACC deaminase activity and also exhibited zinc-solubilizing potential. Well-characterized PSB strains were formulated into consortia and used to develop two organo-bioformulations using Filter Mud (FM) and Cow Dung (CD) with 5% sodium alginate as a natural adhesive. Microcosm studies using Freundlich isotherms showed reduced P adsorption and enhanced P availability compared to diammonium phosphate (DAP). Results: To maintain a critical soil solution P level (0.2 mg L Conclusion: Thus, these bioformulations provide a sustainable solution for nutrient management in calcareous soils, reducing chemical fertilizer use and supporting long-term soil health and crop productivity.
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