Abstract— The current scenario encounters the steady demand of food supply and the application of fertilizer is become an indispensable in modern agriculture. Hence, the present study is focused on distribution of microbial and diazotrophic Azotobacter population in rhizosphere soil sample. Total microbial population viz, bacteria, fungi, actiomycetes and diazotrophic Azotobacter were enumerated from five different rhizosphere soil samples and compared the distribution of diazotrophic Azotobacter with other three microbial groups. The results of enumeration of total microbial population reveals that comparatively the bacterial population found to be higher followed by Azotobacter population in various rhizosphere soil. Based on the predominant growth, five Azotobacter strains (one isolate from each sample) were isolated and authenticated through morphological and biochemical characteristics.
Keywords— Diazotrophs, Microbial population, Nitrogen fixation, Azotobacter.
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