Abstract
The serial dilution plate count method has been generally used to estimate the number of microorganisms in the rhizosphere soil. However, this method gives a partial view of the range of organisms and the microbial biomass in the soil. In view of finding an alternate method to estimate the microbial activity, in the present study the plate count method was compared with the respiratory activity of rhizosphere soil measured by a manometric technique. Two strains of Azotobacter chroococcum were used for seed inoculation of three varieties of wheat. Periodically, the titres of different groups of microorganisms, viz. bacteria, actinomycetes, fungi and Azotobacter were determined by the plate count method and the results obtained were correlated with the respiratory activity of rhizosphere soil.
Published Version
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