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Mahmoud, A., El-Kotkat, M., Omar, M., Mostafa, G. (2011). ACTIVITY OF Azotobacter AND Azospirillum IN THE RHIZOSPHERE OF ONION PLANT. Journal of Agricultural Chemistry and Biotechnology, 2(10), 229-238. doi: 10.21608/jacb.2011.57266
A.H.H. Mahmoud; M. B. O. El-Kotkat; M. N. A. Omar; G. A. Mostafa. "ACTIVITY OF Azotobacter AND Azospirillum IN THE RHIZOSPHERE OF ONION PLANT". Journal of Agricultural Chemistry and Biotechnology, 2, 10, 2011, 229-238. doi: 10.21608/jacb.2011.57266
Mahmoud, A., El-Kotkat, M., Omar, M., Mostafa, G. (2011). 'ACTIVITY OF Azotobacter AND Azospirillum IN THE RHIZOSPHERE OF ONION PLANT', Journal of Agricultural Chemistry and Biotechnology, 2(10), pp. 229-238. doi: 10.21608/jacb.2011.57266
Mahmoud, A., El-Kotkat, M., Omar, M., Mostafa, G. ACTIVITY OF Azotobacter AND Azospirillum IN THE RHIZOSPHERE OF ONION PLANT. Journal of Agricultural Chemistry and Biotechnology, 2011; 2(10): 229-238. doi: 10.21608/jacb.2011.57266

ACTIVITY OF Azotobacter AND Azospirillum IN THE RHIZOSPHERE OF ONION PLANT

Article 4, Volume 2, Issue 10, October 2011, Page 229-238  XML PDF (401.01 K)
Document Type: Original Article
DOI: 10.21608/jacb.2011.57266
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Authors
A.H.H. Mahmoud1; M. B. O. El-Kotkat1; M. N. A. Omar2; G. A. Mostafa2
1Fac. Agric., Al-Azhar Univ., Cairo, Egypt.
2Soil and Water Research Institute, ARC.
Abstract
This study was carried out to evaluate the influence of inoculation with nitrogen fixing bacteria (Azotobacter and Azospirillum) that were isolated from onion rhizosphere. The isolates were applied in field experiment to investigate the effect of inoculation with Azotobacter and Azospirillum, on Nitrogenase activity .  Isolation and enumeration of Azotobacter and Azospirillum from the soil of onion plants were studied and determination of the enzymatic activities of nitrogen fixing bacteria (nitrogenase) that were isolated from  the soil of onion plant during the growing periods at 0, 30, 60, 90, 120 and 150 days after sowing and selected active isolate of Azotobacter and Azospirillum. The obtained results revealed increases in Azotobacter and Azospirillum numbers as well as nitrogenase activity in rhizosphere onion regions. Also these activities reflect on onion plant productivity. This study recommended the application of Azotobacter and Azospirillum as inoculants in onion plant productivity.
Keywords
Isolation Azotobacter; Azospirillum; Nitrogenase activity
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