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Custom Soil Resource Report <br /> Slope alluvium <br /> Sediment gradually transported down the slopes of mountains or hills primarily <br /> by nonchannel alluvial processes (i.e., slope-wash processes) and <br /> characterized by particle sorting. Lateral particle sorting is evident on long <br /> slopes. In a profile sequence, sediments may be distinguished by differences in <br /> size and/or specific gravity of rock fragments and may be separated by stone <br /> lines. Burnished peds and sorting of rounded or subrounded pebbles or cobbles <br /> distinguish these materials from unsorted colluvial deposits. <br /> Slow refill <br /> The slow filling of ponds, resulting from restricted water transmission in the soil. <br /> Slow water movement <br /> Restricted downward movement of water through the soil. See Saturated <br /> hydraulic conductivity. <br /> Sodic (alkali) soil <br /> A soil having so high a degree of alkalinity (pH 8.5 or higher) or so high a <br /> percentage of exchangeable sodium (15 percent or more of the total <br /> exchangeable bases), or both, that plant growth is restricted. <br /> Sodic spot (map symbol) <br /> An area where the surface layer has a sodium adsorption ratio that is at least <br /> 10 more than that of the surface layer of the named soils in the surrounding <br /> map unit. The surface layer of the surrounding soils has a sodium adsorption <br /> ratio of 5 or less. <br /> Sodicity <br /> The degree to which a soil is affected by exchangeable sodium. Sodicity is <br /> expressed as a sodium adsorption ratio (SAR) of a saturation extract, or the <br /> ratio of Na+to Ca++ + Mg++. The degrees of sodicity and their respective ratios <br /> are: <br /> Slight: Less than 13:1 <br /> Moderate: 13-30:1 <br /> Strong: More than 30:1 <br /> Sodium adsorption ratio (SAR) <br /> A measure of the amount of sodium (Na) relative to calcium (Ca) and <br /> magnesium (Mg) in the water extract from saturated soil paste. It is the ratio of <br /> the Na concentration divided by the square root of one-half of the Ca + Mg <br /> concentration. <br /> Soft bedrock <br /> Bedrock that can be excavated with trenching machines, backhoes, small <br /> rippers, and other equipment commonly used in construction. <br /> 66 <br />