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  1. Ortstein horizon: This strongly cemented Bhc, Bhfc or Bfc horizon is at least 3 cm thick and occurs in more than one-third of the exposed face of the pedon. Ortstein horizons are generally reddish brown to very dark reddish brown. Permafrost: Permanently frozen (i.e., soil temperatures less than 0 °C) ground.

    • Horizons

      The assignment of mineral soil layers to each horizon is...

    • Brunisolic

      The main horizon associated with the Brunisolic order is the...

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      Soil formation (also termed soil genesis or pedogenesis) is...

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      This O horizon consists largely of fibric materials that are...

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  2. Common horizon sequence: LFH or O, Ae, Bhf, Bhfc or Bfc, BC, C . These soils have the general properties specified for the Podzolic order and the Ferro-Humic Podzol great group. They differ from Orthic Ferro-Humic Podzols by having an ortstein horizon at least 3 cm thick. An ortstein horizon is a Bh, Bhf, or Bf horizon that is strongly cemented ...

  3. An ortstein horizon in this subgroup is a Bhf or Bf horizon that is strongly cemented and occurs in at least one-third of the lateral extent of the pedon. Ortstein horizons are generally reddish brown to very dark reddish brown in color. Usually Ortstein Humo-Ferric Podzols have L, F, and H or O horizons and an Ae horizon. They may have faint ...

  4. Ortstein subgroup Soils of this subgroup have an Orstein horizon (Bhc, Bfc) at least 3 cm thick. Placic subgroup These soils have a Placic (Bhfc, Bfc) horizon that can be either a single layer or multiple layers of thin (commonly < 5 mm) layers that are hard, impervious, and dark reddish brown to black and which may form a braided pattern as they join together and break apart into separate layers.

  5. The great groups were subdivided into subgroups designated by placing the following adjectives before the great group names: Orthic (central concept), Ortstein (cemented B horizon), Placic (thin ironpan), Duric (cemented subsoil), Fragic (fragipan horizon), Luvisolic (horizon of clay accumulation), Sombric (thick organomineral surface horizon) and Gleyed (presence of redox features).

    • Paul Sanborn, Luc Lamontagne, William Hendershot
    • 2011
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  6. Jan 1, 2014 · A huge accumulation of the complexes leads to the formation of coherent aggregates, and even of continuous, highly cemented layers referred to as ortstein. Properties: Ortstein is 25 mm or more thick and 50% or more (by volume) cemented (Soil Survey Staff, 1999). As a rule, the horizon has sandy grain-size distribution.

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  8. Jan 1, 2014 · The ortstein horizon limits but does not preclude rooting; a few fine roots were reported in ortstein horizons of 11 pedons that were ≥50 % cemented. Ortstein and placic horizons are extracted with Na pyrophosphate for Fe p and Al p , acid NH 4 oxalate by Fe o and Al o , and Na citrate-dithionite-bicarbonate for Fe d and Al d to determine the nature of the cementing agents.

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