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Table 10 <br />• Suitability Ratings for Soils as Sources <br />of Topsoiling Material* <br />Degree of Soil Suitability <br />• <br />Soil Characteristic Good Fair Poor <br />pH 1/ <br />Conductivity (E.C.) <br />mmhos/ ® @ 25° <br />Saturation Percent- <br />age (SP) <br />Texture class <br />6.0 - 8.4 5.5 - 6.0 <br />8.4 - 8.8 <br />Under 4 4 - 8 <br />25 - 80 <br />sl, 1, sil, <br />scl <br />cl, sicl, <br />sc, is <br />6 - 10 <br />moderate <br />(15 - 30X) <br />loose, firm <br />slight hard, <br />hard <br />Sodium Adsorption Under 6 <br />Ratio (SAR) <br />Calcium Carbonate 2/ nova-alight <br />(0 - 15X) <br />Moist Consistence friable <br />Dry Consistence loose, soft <br />2 ppm or less <br />5 ppm or less <br />5.0 - 5.5 <br />8.8 - 9.0 <br />8 - 16 <br />Over 80 <br />Under 25 <br />c, sic, s <br />10 - 15 <br />Unsuitable <br />Under 5.0 <br />Over 9.0 <br />Over 16 <br />Over 15 <br />high <br />(Over 30X) <br />very firm <br />very hard <br />greater than 2 ppm <br />greater than 5 ppm <br />Selenium 3/ <br />Boron 4/ <br />1/ Saturated Soil Paste, U.S.D.A. Handbook 60, pg. 102. <br />2/ Effervescence with acid or CaC03 equivalent, II.S.D.A. Handbook 60, <br />pg. 105. <br />3/ Hot water soluble, A.S.A. Mono ¢9, Part 2, pgs. 1122-23. <br />4/ Hot water soluble, A.S.A. Mono 09, Part 2, pgs. 1062-63. <br />5/ Establishment of vegetation on soils having any of these eatreme <br />conditions would be severely restricted. <br />* From Wyoming Department of Land Quality Guideline No. 3 <br /> <br />2.04-72 <br />