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This article in SSSAJ

  1. Vol. 22 No. 5, p. 445-449
    Received: Sept 30, 1957
    Accepted: Apr 29, 1958

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Sequence Relationships of Loess-Derived Forested Planosols in Southeastern Iowa1

  1. Charles C. Cain and
  2. F. F. Riecken2



According to genetic theory, the loess-derived soil series of southeastern Iowa can be arranged in a number of sequences. As for a number of other sequences studied previously, there is increasing clay in the Bt layer with decreasing loess thickness. The forested Planosols have an A1(Ap)A2BgC1 genetic horizon sequence. They have greater textural differences and a more abrupt boundary between the A and B horizons than any other sequence. In the forested Planosols, there is a secondary accumulation of N and organic P in the B horizon; the free Fe tends to accumulate in the A2B transition layer.

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