Abstract
Indonesian acid soils were used to determine an optimum population size of indigenous P-solubilizing bacteria (PSB) for solubilizating fixed P. The experiment consisted of two sub-experiments. Sub-experiment I was to isolate the indigenous PSB from Ultisols, Fresh-water lowland Inceptisols, and tidal-swamp Inceptisols. Subexpriment II was to study the capacity of the isolated PSB to correct P availability in acid soils by inoculating the isolated PSB into the tested soils at 0, 105, 1010, and 1015 cells. The population of the indigenous PSB in the tested soils increased as a result of the inoculation. Both Al-P and Fe-P content in the three tested soils decreased as compared with the initial content. The increases of available P were significantly correlated with the decreases both in Al-P (r2 = 0.68 for the Ultisols; r2 = 0.51 for the fresh-water Inceptisols; and r2 = 0.35 for the tidal-swamp Inceptisols) and in Fe-P (r2 = 0.91 for the Ultisols; r2 = 0.45 for the fresh-water lowland Inceptisols; and r2 = 0.78 for the tidal-swamp Inceptisols). The increases of available P were significantly correlated with the increases of the population of the PSB (r2 = 0.60 for the Ultisols; r2 = 0.55 for the fresh-water lowland Inceptisols; and r2 = 0.69 for the tidal-swamp Inceptisols). The available P in the three tested soils sharply increased if the population size of the PSB was about 1 × 109 cfu g-1 of soil. Keywords: Al-P, Fe-P, fresh-water lowland, isolated, Pikovskaya medium, tidal swamp
Highlights
The form of P most readily accessed by plants is Pi, the concentration of which rarely exceeds 10 μm in soil solutions (Bieleski 1973; Paul and Clark 1989)
Similar results were reported by Reyes et al (2002) who observed a significant increase of total rhizospheric bacterial community and P-solubilizing bacteria (PSB) population in soil as a result of introducing nonindigenous strain of PSB
The increases in population density of PSB observed in current study as well in previous study by Reyes et al (2002) confirmed that the introduced PSB successfully colonized the soil and interacted with the indigenous PSB
Summary
The form of P most readily accessed by plants is Pi (in-organic P), the concentration of which rarely exceeds 10 μm in soil solutions (Bieleski 1973; Paul and Clark 1989). In many agricultural systems, application of P fertilizers to the soil is necessary to ensure plant growth and productivity. Various soil properties have been reported to be closely related to the P retention capacity of soils (Bertrand et al 2003; Daly et al 2001; Leclerc et al 2001). Burt et al (2002), Borling et al (2001) and Ige et al (2003) suggested the combination of FeOX and AlOX for the prediction of soil P sorption capacity in noncalcareous soils. J Trop Soils, Vol 16, No 1, 2011: 55-62 ISSN 0852-257X
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