African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 4900

Full Length Research Paper

Screening of bacteria isolated from the rhizosphere of maize plant (Zea mays L.) for ammonia production and nitrogen fixation

Patrick Okorie Richard
  • Patrick Okorie Richard
  • Department of Microbiology, Environmental Microbiology and Biotechnology Laboratory, University of Ibadan, Nigeria.
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Abimbola Olumide Adekanmbi
  • Abimbola Olumide Adekanmbi
  • Department of Microbiology, Environmental Microbiology and Biotechnology Laboratory, University of Ibadan, Nigeria.
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Adeniyi Adewale Ogunjobi
  • Adeniyi Adewale Ogunjobi
  • Department of Microbiology, Environmental Microbiology and Biotechnology Laboratory, University of Ibadan, Nigeria.
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  •  Received: 06 August 2018
  •  Accepted: 10 September 2018
  •  Published: 14 September 2018

Abstract

Eleven (11) rhizobacteria identified as Azospirillum sp. isolated from the rhizosphere of maize plants grown in Ibadan, Oyo State, Nigeria were evaluated for ammonia production and nitrogen fixation. The micro-Kjeldahl method was used for the screening of the isolates for nitrogen fixation. Nitrogenase activity ranging from 1.20 to 10.60% was detected in seven of the eleven isolates. Results show that treatments with the application of organic fertilizers enhanced bacterial population and also showed higher nitrogenase activity in rhizosphere soil compared to inorganic fertilizer and control treatments. This showed that organic manure would be a better alternative to chemical fertilizers in maize farming. It was also observed from this study, that Azospirillum possess high nitrogenase activity allowing for the possibility of using this bacteria as a biofertilizer to improve soil fertility for improved and efficient farming.

 

Key words: Rhizobacteria, rhizosphere, nitrogen fixation, nitrogenase activity, biofertilizer.