Direct Assimilation of Ammonium Salts by Plants

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Abstract
Ithas recently been shown that the soil of some of the Rothamsted Grass Plots which have received ammonium salts for many years in succession has become distinctly acid and that, consequently, nitrifying organisms have become greatly reduced in numbers. Nitrification is limited to portions of soil directly in contact with the few particles of calcium carbonate still remaining in the soil. It is evident therefore that more or less of the nitrogen assimilated by the grasses must be in a form, or in forms, other than nitrate—probably mainly as ammonium salt. In view of these results it seemed desirable to obtain additional evidence of direct assimilation of ammonium salts by plants.

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