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Custom Soil Resource Report <br />and sorting of rounded or subrounded pebbles or cobbles distinguish these <br />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 10 <br />more than that of the surface layer of the named soils in the surrounding map unit. <br />The surface layer of the surrounding soils has a sodium adsorption ratio of 5 or <br />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 ratio <br />of Na+ to Ca++ + Mg++. The degrees of sodicity and their respective ratios 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 magnesium <br />(Mg) in the water extract from saturated soil paste. It is the ratio of the Na <br />concentration divided by the square root of one-half of the Ca + Mg concentration. <br />Soft bedrock <br />Bedrock that can be excavated with trenching machines, backhoes, small rippers, <br />and other equipment commonly used in construction. <br />Soil <br />A natural, three-dimensional body at the earth's surface. It is capable of supporting <br />plants and has properties resulting from the integrated effect of climate and living <br />matter acting on earthy parent material, as conditioned by relief and by the <br />passage of time. <br />Soil separates <br />Mineral particles less than 2 millimeters in equivalent diameter and ranging <br />between specified size limits. The names and sizes, in millimeters, of separates <br />recognized in the United States are as follows: <br />52 <br />