Grass plants were grown axenically in sand and were then inoculated with either one bacterial species or a mixture of two species. Numbers of bacteria on the root surface were subsequently determined by dilution plating. When six bacterial species were inoculated on to separate plants, the species with the smallest individual cells produced greatest numbers per mg root after 15 d. When was inoculated on to three grass species, and , there was no significant difference between the grasses in the number of bacteria per mg of root which subsequently developed. and a sp. were inoculated, separately or together, on to , grown either with a complete nutrient solution or one deficient in either nitrogen or phosphorus. The sp. increased more slowly than , a difference enhanced when they were on the same plant. Decreased nitrogen supply, although it reduced plant growth, had no significant effect on bacterial numbers, whereas phosphorus deficiency increased the numbers of both bacterial species.


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