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Book: Determinants of Soil Loss Tolerance
Published by: American Society of Agronomy and Soil Science Society of America



  1.  p. 113-130
    ASA Special Publication 45.
    Determinants of Soil Loss Tolerance

    B.L. Schmidt (ed.)

    ISBN: 978-0-89118-311-2


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Erosion Tolerance for Cropland: Application of the Soil Survey Data Base 1

  1. R. B. Grossman and
  2. C. R. Berdanier2


A proposal is given for the systematic assignment of soil loss tolerances (T values) based on properties of soil profiles. The T value is conceived as the product of a T value assigned to deep, uniform soils and a T value adjustment factor. The former presumably may change with societal needs. The proposed T-value adjustment factor is calculated from soil properties and would remain constant unless the criteria change. Potential plant rooting depth is pivotal to the T-value adjustment factor and involves a search to the 2-m depth for (1) taxonomic features indicative of root growth limitation; (2) horizons with high strength and weak structure; and (3) horizons high in extractable Al, low in Ca, or both. An additional adjustment is made based on soil property changes within the potential plant rooting depth that are indicative of the effect erosion may have on soil productivity.

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Copyright © 1982. Copyright 1982 by the American Society of Agronomy and Soil Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA