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An extract from the Program Description of Soil Horizon Depth Correction Based on Slope Gradient, Gordon Warrington, USDA Forest Service, Technical Notes WSDG-TN-00001, DEC 1980, 10 pages.

… reasons for reporting depths of soil horizons on steep terrain, as distances that are perpendicular to the soil surface … On steep slopes … the differences between vertical measurements … perpendicular measurements … can be important … interpretations and taxonomic classification. Water holding capacity and other soil properties … overestimated … procedure … adjust vertical depth measurements to distances … perpendicular to a soil surface …


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