Experiments in Soil Genesis—The Role of Leaching1
- James Thorp,
- Laurence E. Strong and
- Erling Gamble2
As a part of our study of the processes contributing to the formation of soils from glacial deposits we have examined the chemical and physical changes produced by organic acids and water-soluble materials found in leaves. Our laboratory procedure used columns of Miami B2 soil through which various solutions were passed intermittently. These solutions flowed through the columns and were then collected at intervals and analyzed. Appreciable quantities of calcium, magnesium, iron, and manganese were mobilized in this way. In addition we found detectable amounts of fine silicate clays moving in suspension. Evidence for redeposition of iron compounds within the soil columns was found as well as the formation of “colloidal” films holding the originally discrete soil particles together. Colored bands which appeared in the columns were suggestive of soil horizons found in the field, particularly among the Podzolic soils.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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