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This article in SSSAJ

  1. Vol. 52 No. 6, p. 1753-1758
     
    Received: Oct 14, 1987
    Published: Nov, 1988


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doi:10.2136/sssaj1988.03615995005200060043x

Characteristics of Histic Materials in Wisconsin as Arrayed in Four Classes

  1. G. B. Lee ,
  2. S. W. Bullington and
  3. F. W. Madison
  1. Dep. of Soil Science, Univ. of Wisconsin-Madison

Abstract

Abstract

Samples of histic materials were collected throughout Wisconsin and analyzed for characteristics common to these materials. On the basis of resistant fiber content, they were ordered into four classes. Fibric and Hemic materials are similar to those in Fibrist and Hemist suborders. Sapric A materials are defined here as those containing from 8 to 20% fiber; sapric B materials contain 0 to 7%. Fiber, moisture, and organic C content decrease from fibric to sapric B material. Sodium pyrophosphate extract color (SPEC) values and C/N ratios follow the same trend. Percentage N and ash content increase in value, as does pH and bulk density. The low fiber content, which is indicated directly by volume and indirectly by SPEC values, low moisture content and C/N ratios, high N and bulk density values, and ash content, are characteristic of sapric B materials, and should be used in further definition of this class.

Contribution from the College of Agricultural and Life Sciences, Univ. of Wisconsin-Madison. Research supported by Univ. of Wisconsin-Madison Hatch project 2494 and by USDI DOE Grant DEF G18-81FC10503-1. Figures by J.D. Lee.

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