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<br /> <br />• Table I-4. Suitability Ratings for Topsoil Material. <br />i <br />i <br />z <br />z <br />i <br />3 <br />3 <br />i <br /> <br />Soil Degree of Suitability <br />Parameter Good Fair Poor Unsuitable <br />pH 6.1-7.8 5.1-6.1 <br />7.9-8.4 4.5-5.0 <br />8.5-9.0 <4.5 <br />>9.1 <br />Conductivity (EC) <br />mmhos/cm at 25°C. <3 3-6 6-9 > 9 <br />Saturation Point <br />(SAT) (%) 25-80 < 25 <br />> 80 <br />Sodium Adsorption <br />Ratio (SAR) <6 6-10 10-15 > 15 <br />Texture4 fsl, vfsl, 1, <br />sl, sil cl, scl, <br />sicl sic, c, s, <br />ls, sc c <br />> 60% cla <br />Boron <8 ppm >8 ppm <br />Copper <40 ppm >40 ppm <br />Lime Estimate Slight to Moderate High <br />Urganic Matter (%) >1.5 0.5-1.5 <0.5 <br />1 USDA - Forest Service <br />2 Wyoming DEQ; Guideline No. 3. <br />3 Dollhopf, D.J., et al., 1977 V.I, p. 43. <br />4 Silty clay and sandy clay materials may have a fair rating with organic matter <br />contents >1.0% and saturation percentages < 60%. <br />• <br />I-6 <br />