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The "Rhizosphere Effect" on the Nutritional Groups of Soil Bacteria¹

ABSTRACT

The effect of the growing plant on the balance between certain nutritional groups of soil bacteria is discussed in the light of a paper by Wallace and King who reported findings at variance with those obtained in this laboratory. Since the "rhizosphere effect" is considered to be the influence exerted by the growing plant in its immediate environment, rhizosphere and control samples from field tests should be regarded as a unit. The control samples taken by Wallace and King bore no direct relation to the location of the plants whose rhizosphere effects were under study; their procedure was therefore radically different from that used in this laboratory and consequently any precise comparison of results is vitiated. One of the most characteristic rhizosphere effects is believed to be the preferential stimulation of bacteria requiring amino acids and data from experiments with a variety of crops are presented.

¹ Contribution No. 376 from the Bacteriology Division, Science Service, Canada Department of Agriculture, Ottawa.

² Chief, Bacteriology Division and Senior Bacteriologist, respectively.

Received for publication August 12, 1954.