1. Modification of Inorganic Fractions of Phosphorus by Phosphate-Solubilising Microorganisms in Conjunction with Phosphorus Fertilisation in a Tropical Inceptisol
- Author
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Alam, Khurshid, Barman, Mandira, Datta, Siba Prasad, Annapurna, Kannepalli, and Shukla, Livleen
- 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 vistheir 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.
- Published
- 2023
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