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• GUIDELINES <br />SUITABILITY RATINGS FOR SOILS AS <br />Source: Wyoming Department <br />Degree of <br />SOIL CHARACTERISTIC GOOD <br />TABLE 1 <br />SOURCES OF TOPSOILING MATERIAL <br />of Environmental Quality <br />Soil Suitability <br />FAIR ~~ POOR UNSU <br />pH 1/ <br /> <br />Conductivity (EC) <br />mmhos/cm @ 25c 6.0-8.4 <br /> <br /> <br />Under 4 5.5-6.0 <br />8.4-8.8 <br /> <br />4-8 5.0-5.5 <br />8.8-9.0 <br /> <br />8-16 Under 5.0 <br />Over 9.0 <br /> <br />Over 16 <br />Saturation Percentage Over 80 <br />(SP) 25-80 Under 25 <br />Texture Class sl, 1, sil, cl, sicl, c, sic, s <br /> scl sc, is <br />Sodium Absorption Under 6 6-10 10-15 Over 15 <br />• <br />Ratio (SAR) <br />?/ <br />Calcium Carbonate none-slight moderate high <br /> (0-158) (15-308) (over 308) <br />Moist Consistence friable loose,firin very firm <br />Dry Consistence <br />loose, soft slight, <br />hard <br />very hard <br />Selenium 3/ <br />4/ <br />Boron <br />2 ppm or less <br />5 ppm or less <br />greater than 2 ppm <br />greater than 5 ppm <br /> 1/ Saturated Soil Paste, U.S.D.A. Handbook 60, p. 102. <br /> 2/ Effervescence with acid or CaC03 equivalent, U.S.D.A. Handbook 60, p. 105. <br /> 3/ Hot water soluble, A.S.A. Mono #g, Part 2, pgs. 1122-23. <br /> 4/ Hot water soluble, A.S.A. Mono #9, Part 2, pgs. 1062-63. <br /> 5/ Establishment of vegetation on soils having any of these extreme conditions <br />• would be severely restricted. <br />-115- <br />