Points from Foregoing Letters


    EXPERIMENTS by Prof. A. I. Virtanen show that legume nodules excrete more nitrogen compounds in the presence of kaolin, sand or soil than in water cultures. The excretion is helped by the presence of other plants (barley, potatoes). The author considers that the distribution of the nitrogen compounds between the nodule and the external medium is determined by an equilibrium, and the removal of the compounds, either by adsorption on sand, etc., or their utilization by other plants, leads to further secretion. In certain circumstances, potatoes when grown with peas actually acquire more nitrogen compounds than the peas themselves.

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    Points from Foregoing Letters. Nature 138, 887 (1936). https://doi.org/10.1038/138887a0

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