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Performance and persistence of phosphate solubilizing Azotobacter chroococcum in wheat rhizosphere
V Kumar1, N K Aggarwal, B P Singh
1Department of Microbiology and Department of Agronomy, Haryana Agricultural University, Hisar 125 004, India.
Abstract:
Survival and establishment of inoculant strains of Azotobacter chroococcum NV 11 and its mutant NV 43 were assessed in sterilized soil and rhizosphere soil of wheat plants at 7 and 15 d interval, respectively, after sowing, i.e., up to 45 d under pot-house conditions. There was an apparent decrease in population of both strains in bulk soil but a steady increase was observed in root zones of the wheat plant. 10(3) to 10(4) introduced bacteria per g root were found sticking to roots. Further studies indicated that inoculant strains of Azotobacter could survive, proliferate and establish well in root zones.