Abstract
The experiment on inoculation of Azotobacter chroococcum on cv. IR–64 of Oryza sativa L. in integration with different levels of exogenous nitrogen (urea-nitrogen) conducted on paddy soil in earthenware pots in rainy autumn season in West Tripura. The result indicated that, integration of 50 and 75% of the recommended dose of exogenous nitrogen fertiliser (i.e., 40 kg N ha-1 and 60 kg N ha-1) is the optimum level when the rhizobacteria, A. chroococcum results better in vivo nitrate reductase activity in the leaves, in vivo nitrogenase (N2-ase) activity on the root surface and viable counts, i.e., colony forming units (CFU) of microorganisms of rhizosphere soil of inoculated plants. Further increase of exogenous nitrogen inhibited both the nitrate reductase and nitrogenase activity and also decreased the population of microorganisms from rhizosphere soil.
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