Characteristics of Histic Materials in Wisconsin as Arrayed in Four Classes
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.
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