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This article in SSSAJ

  1. Vol. 20 No. 2, p. 204-208
    Received: July 28, 1955

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Effect of Some Long-Time Rotations on the Amino Acid Composition of the Soil1

  1. F. J. Stevenson2



The technique of ion exchange chromatography has been further refined for the isolation and quantitative determination of the ninhydrin-positive components of soil hydrolysates. The method was used to determine the effect of some long-time rotations on the distribution of amino acids in soils. The soils used for this purpose were taken from the Morrow Plots at the University of Illinois.

It was found that these plots differed in both the proportion of the soil nitrogen present as α-amino acid nitrogen and in the relative distribution of amino acids. The most striking difference was in the basic amino acid content of these soils, where a high quantity of basic compounds was associated with the untreated rotations. An explanation is given to account for these observations.

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