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Modification of Inorganic Fractions of Phosphorus by Phosphate-Solubilising Microorganisms in Conjunction with Phosphorus Fertilisation in a Tropical Inceptisol

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Abstract 

It is urgent to find ways to utilise the accumulated recalcitrant phosphorus (P) in soil, as natural rock phosphate reserves are at a verge of depletion. Phosphate-solubilising microorganisms (PSMs) can be a cost-effective and eco-friendly approach to address the problem. A pot culture experiment was carried out to evaluate the changes in various inorganic fractions of P in an Inceptisol vis a vis their availability to the plant using PSMs. A bulk surface soil sample was obtained from New Delhi (pH = 8.30) and after processing, three levels of P and three levels of PSM (No-PSM, phosphate-solubilising bacteria (PSB), and phosphate-solubilising fungi (PSF)) were applied in a completely randomised design with three replications. Soybean (Glycine max) was grown as test crop. By and large, various P fractions followed the order: Ca-bound P (Ca-P, 46.9%) > residual-P (RES-P, 22.8%) > reductant-soluble P (RS-P, 11.6%) > Al-bound P (Al-P, 11.0%) > Fe-bound P (Fe–P, 4.06%) > occluded P (OC-P, 2.51%) > soluble and loosely bound-P (SL-P, 1.21%). Application of PSB significantly increased the SL-P by solubilising the Al-P, Fe–P and Ca-P in soil. The PSB increased the dry-matter yield of soybean by ~ 8.41%, whereas, applied PSF had no effect on either soil P fractions or plant dry-matter yield. Combined application of a reduced dose of P along with PSB can be practised in order to utilise native soil P without compromising the crop yield.

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Acknowledgements

The authors thank Director, ICAR-IARI for his constant support during the study. The financial support received by the first author during the M.Sc. course in the form of Junior Research Fellowship (JRF) from the Indian Council of Agricultural Research (ICAR) is hereby acknowledged.

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Indian Agricultural Research Institute (ICAR-IARI), New Delhi, India.

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Correspondence to Mandira Barman.

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Alam, K., Barman, M., Datta, S.P. et al. Modification of Inorganic Fractions of Phosphorus by Phosphate-Solubilising Microorganisms in Conjunction with Phosphorus Fertilisation in a Tropical Inceptisol. J Soil Sci Plant Nutr 23, 2488–2497 (2023). https://doi.org/10.1007/s42729-023-01206-6

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  • DOI: https://doi.org/10.1007/s42729-023-01206-6

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