Abstract
1. Greater accumulations of fungi, bacteria and actinomycetes in the rhizosphere than in the control soils were recorded. 2. A decreasing order of ‘rhizosphere effect’ as follows was noticed: bacteria > fungi > actinomycetes. 3. Maximum ‘rhizosphere effect’ on bacteria was noticed during the time of flowering. Increase in fungal numbers after flowering was recorded. 4. Changes in the total fungal numbers correspond with the changes in numbers of Aspergilli and Penicillia, both in the dilution plates and the root platings. 5. The absence of certain predominant fungi likeFusarium spp.,Macrophomina phaseoli, Neocosmospora vasinfecta in the rhizosphere dilutions emphasizes the necessity of assessing the physiological state in which they are extant in the rhizosphere. 6. Sorghum stands unique in that its rhizosphere had highest numbers of fungi among the non-legumes and highest numbers of actinomycetes among all the plants studied. The potential root pathogens so often encountered in the rhizosphere of other plants were absent in the case ofSorghum.
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