Summary
Among several phosphate-solibilizing micro-organisms isolated from an alluvial soil (Fluvaquent) in sucrose-Ca3(PO4)2 agar plates, two fungal strains, ACF2 (Aspergillus candidus) and ACF1 (A. fumigatus) two bacterial strains, ACB5 (Bacillus firmus B-7650) and ACB6 (B. firmus B-7651) and one actinomycete strain, ACS6 (Streptomyces sp.) were efficient solubilizers, solubilizing 297.0, 288.3, 49.0, 45.8 and 29.0 μg of P as free PO4 −3, respectively, containing 15 mg insoluble P from Ca3(PO4)2 in broth. Solubilization was lesser from AlPO4 and FePO4. The isolates producing oxalic and tartaric acids without or with citric acid showed higher ability of solubilizing insoluble inorganic phosphates.
All the above isolates possessed the ability of solubilizing rock phosphate in considerable amounts, ACF1 (A. fumigatus) being the highest (31.5 μg), while ACB6 (B. firmus B-7651) and both the aspergilli also possessed cellulose-decomposing ability in addition.
Inoculation of the isolates, in a flask culture experiment, had no significant effect on the accumulation of available phosphorus in soil even when amended with rock phosphate (RP), farm yard manure (FYM), (FYM+RP), rice straw (RS) and (RS+RP). Nevertheless, the overall performance of ACF2 (A. candidus) and ACB6 (B. firmus B-7651) was better than that of the others, in this respect, while ACB5 (B. firmus B-7650) and ACF1 (A. fumigatus) intensified the enhancing effect of FYM and RS. Partial sterilization, by autoclaving, of the soil had no significant effect on available phosphorus content of the soil irrespective of any inoculation.
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Banik, S., Dey, B.K. Available phosphate content of an alluvial soil as influenced by inoculation of some isolated phosphate-solubilizing micro-organisms. Plant Soil 69, 353–364 (1982). https://doi.org/10.1007/BF02372456
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DOI: https://doi.org/10.1007/BF02372456