Open AccessSurvival of a Phosphate Solubilizing Microorganism in Ion-Sterile Carriers
Author(s) -
Fatih Er,
Mehmet Öğüt
Publication year - 2010
Publication title -
eurasian chemico-technological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 9
eISSN - 2522-4867
pISSN - 1562-3920
DOI - 10.18321/ectj48
Subject(s) - population , lolium perenne , chemistry , incubation , phosphate , nuclear chemistry , phosphorite , zoology , biology , biochemistry , botany , poaceae , demography , sociology
A cold-tolerant phosphate solubilizing bacterium (PSB) was isolated from roots of ryegrass ( Lolium perenne L.). Studies involving phosphate solubilization in liquid culture and survival of the PSB in non-sterile zeolite, leonardite, peat, rock phosphate, and an organic fertilizer were performed. The PSB was able to dissolve 163 ppm P with a simultaneous fall in pH (from 7.7 to 5.7) in Pikovskaya’s medium during a ten-day incubation. The number of PSB declined logarithmically in 28 o C incubation regardless of the carrier. The rate of decrease in PSB population was less pronounced in zeolite. However, the PSB’s population density increased up to 10 9 cfu g -1 , and stayed in the range of 10 8 to 10 9 cfu g -1 in zeolite and rock phosphate after 13-weeks of storage at +4 o C. The contaminant microorganisms also grew in the carriers, with population densities ranging between 10 8 to 10 9 cfu g -1 at week-9. The suppression of the local microorganisms is required to increase the quality of organic fertilizer by the addition of PSB. Zeolite could be a good carrier, due to its large surface area and porosity, which allow high number of microorganisms to occupy.