Decreasing pH during phytase production in liquid
culture is a common feature of phosphate solubilizing
bacterial isolates as major microbiological means by which
insoluble phosphate compounds are mobilized is the production
of organic acids, accompanied by acidification of
the medium. The organic and inorganic acids convert tricalcium
phosphate in soil to di- and mono-basic phosphates
with the net result of and enhanced availability of the
element to the plants (Song et al. 2005). Decreased media
pH during this study revealed their possible application as
phosphate solubilizer and liquid bio-fertilizer for increasing
plant growth and productivity. Characterization of
these PSB isolates for their ability to solubilize different
kinds of phosphate compounds will be the very important
aspect of further studies on these isolates.