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• depth and thickness of horizons <br />. • relative position of soil horizons <br />• type and nature of horizon boundaries <br />• color (dry and moist) of horizons <br />• texture (fine earth fraction) <br />• coarse fragment content (type -gravel, cobble, sandstone channer, etc.; size (2mm-3", 3"-10", <br /> greater than 10"); and percent (%) by volume, if significant) <br />• soil structure (type, size, and grade) <br />• soil consistence (dry, moist, and wet) <br />• roots (number, size, and depths) <br />• clay films, if present (number, thickness, occurrence) <br />• effervescence with 0.1 N HCI (none, slight, moderate, strong, violent) <br />• mottles, rf present (number, size, distinctness, color) <br />• soil moisture characteristics at the time of sampling <br />In addition, at each soil sampling site, the following parameters were also described: <br />• vegetation <br />• parent material <br />• physiography (geomorphic position) <br />• relief, if significant <br />• elevation (obtainable from topographic maps) <br />• slope <br />• aspect <br />• erosion condition <br />• permeability <br />• internal drainage class <br />• depth to ground water, if encountered <br />• salts or alkali <br />• surface stoniness <br />The sampling site location and number were plotted on the field map as accurately as possible. <br />(REVISED2/00) 2.04.9-7 <br />