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Potential of phosphorus solubilizing microorganisms to transform soil P fractions in sub-tropical Udic Haplustalfs soil

Ahmad Ali Khan, Ghulam Jilani, Muhammad Saleem Akhtar, Muhammad Islam, S.M. Saqlan Naqvi

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J. Bio. Env. Sci.7(3), 220-227, September 2015

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Abstract

The objective of the present study was to investigate the effect of phosphorus solubilizing microorganisms (PSMs) for their potential to transform soil phosphorus fractions. For the purpose, non-calcareous sieved subtropical Udic Haplustalfs soil (Kahuta soil series) was thoroughly mixed with PSM strains, two each from bacteria and fungi and was filled with plastic pots. Maize (Zea mays) was grown in all pots till 90 days after sowing. Inorganic phosphorus fertilizer was not applied in any pot. Soil samples were taken at 30 day interval till 90th day and were analyzed for different phosphorus fractions sequentially. The results revealed that there was significant increase in bio-available P fractions, viz., Olsen and di-calcium bound phosphorus (Ca2-P) with inoculation of PSM. Concomitantly, there was significant decline in apatite (Ca10-P) and octa-calcium phosphate (Ca8-P) with the passage of time. However, occluded soil P fraction remained unaffected by PSM inoculation. Moreover, fungal isolates were more effective in transforming unavailable P fraction into bio-available forms as compared to their bacterial counterparts. Phosphorus solubilizing microorganisms transform soil aluminum and iron bound P fractions to bio-available phosphorus fractions such as di-calcium phosphate and Olsen phosphorus with the passage of time.

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Potential of phosphorus solubilizing microorganisms to transform soil P fractions in sub-tropical Udic Haplustalfs soil

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