SOIL Studies

SOIL Studies

2013, Vol 2, Num, 1     (Pages: 053-061)

Effects of Different Bacteria Application on Solubility of Rock Phosphate

Adem Güneş 1 ,Metin Turan 2 ,Medine Güllüce 3 ,Fikrettin Şahin 2 ,Mehmet Rüştü Karaman 4

1 Atatürk Üniversitesi, Ziraat Fakültesi Toprak Bölümü, Erzurum
2 Yeditepe Üniversitesi, Mühendislik ve Mimarlık Fakültesi, Genetik ve Biyomühendislik Bölümü, İstanbul
3 Atatürk Üniversitesi, Fen Fakültesi Biyoloji Bölümü, Erzurum
4 Gaziosmanpaşa Üniversitesi, Ziraat Fakültesi Toprak Bilimi ve Bitki Besleme Bölümü, Tokat

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In the present study, the capacity of phosphate solubilizing bacterial strain, Azospirillum brasilense SP–245, Bacillus subtilis OSU–142, Bacillus megaterium M3, Raoultella terrigena, Burkholderia cepacia BA–7 have been tested solution culture containing two different rock phosphate sources. Experiment was carried out under laboratory conditions during experiment period 3 times sample was collected (10th, 20th, and 30th day). The phosphorus solubilizing bacteria inoculation decreased solution pH and increased electrical conductivity, and Ca and P concentrations in solution culture of both P source. While the largest pH decrease was found with B. cepacia BA–7, the highest EC values, Ca and P concentrations were found applications of B. megaterium M3 which has the highest acid–alkaline phosphatase enzyme activities and organic acid compound when compared to control during the 30th day of the experiment.


Keywords : Enzyme activity, Phosphate rock, phosphorus solubilization