Abstract
Summary Total microbial flora, as well as some of the important microbial groups were determined in soil and rhizosphere of both common bean and tomato plants at different stages of growth. The accumulation of some important biological substances in root zone was also interpreted. The total microbial flora in general decreased slightly during the growth season in both soil and rhizosphere region. The R/S ratios were positive and ranged from 5 to 20 depending on plant species and ages. There was a distinct relation between the stages of plant development and the densities of total microbial flora, actinomycetes, nitrogen fixing Clostridia, sporeformers, aerobic and anaerobic cellulose decomposers. Densities of aerobic nitrogen fixers (Azotobacter) and fungi seemed to be constant in their low count in the rhizosphere regions during the growth season. The rhizosphere soil was characterised by a higher quantitative content of organic acids and amino acids as compared with the non-rhizosphere soil.
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