Populations of Bacillus megaterium strain B153-2-2 with a rifampicin-resistant marker were studied in the rhizosphere and surrounding soil of soybean (Glycine max) plants for 2 yr in a silt loam soil in the field. B 153-2-2 populations were established soon after introduction into the soil; a significantly greater population density (6 cfu/g of soil) was observed at 2 or 3 wk than at 1 or 4 wk after emergence in a root zone containing a taproot, its main branches, and adjacent soil (...)
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Z. L. Liu (1992) studied this question.