Relative numbers of three species of Rhizobium in Dunkirk silty clay soil
1934
Wilson, J.K.
The data presented in this paper substantiate and extend the thesis that soils vary in their capacity to maintain various species of the root nodule bacteria. As previously pointed out, neither the acidity nor the alkalinity of the soil appears to have had anything to do with this relationship. No significance can be attached to the moisture content of the soil, to the season of the year when the samples were taken, or to the crop on the soil as bearing any relation to the findings. No direct data are available to explain why soils vary in their capacity to support the various species of the root nodule bacteria. It might be pointed out that this numerical relationship coincides very closely with the hardiness of these three species when they are grown on an artificial medium in the laboratory, and also with the hardiness of the three host plants when they are grown in the field.
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