National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present study was conducted in the laboratory and green house to explore the relation between Pseudomonas fluorescens as biocontrol agent and free N-fixers Azotobacter chroococcum and Azospirillum lipoferium bacteria and their effect on their population in rhizosphere, growth, N% in shoot and N content of wheat plants grown in sterilized and unsterilized sandy soil. Results revealed that P. fluorescens interacted negatively with the population of both nitrogen fixing bacteria in wheat rhizosphere and studied plant parameters. Results showed that decreased in A. chroococccum counts in wheat rhizosphere of sterilized soil reached to 93.79% compared to A. chroococccum count in single, while decrease was reached to 82.1 % in unsterilized soil. Also, data obtained showed that in sterilized soil; mixing of P. fluoresences with A. lipoferum caused highly significant lowering in population of A. lipoferum reached to 97.87 %, and by 91.53 % in unsterilized soil comparing with A. lipoferum inoculated singly. According to these results, it is necessary to separate these non-compatible types of bacteria, when added to the soil or seeds to avoid this antagonistic effect between biocontrol bacteria and introduced or indigenous microorganisms and select the compatible organisms in mixed biofertilizer inoculants.
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