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• TABLE L <br />Recommended Fertility Levels far Native and <br />Improved Range Grasses <br />Suitability Level <br />1 1 <br />Parameter Excellent High Moderate Low Reference <br /> pH 6.1-7.3 5.6-6.0 5.0-5.5 <5.0 5,7 <br /> 7.4-7.8 7.9-8.9 >8.9 <br /> Organic Matter, X >2.5 1.6-2.5 0.6-1.5 0-0.5 2.8 <br /> 2 <br /> Ammonium, ppm >15 10-15 5-9 0-4 3,6 <br /> 2 <br /> Nitrate, ppm >12 7-12 3-b 0-.2 2,3,4,6 <br /> Phosphorus, ppm >10 7-10 4-6 0-3 3,6 <br /> (NaHCO) <br /> 9 <br /> Tex ture SILL SL LL,SCL S,LS,C 8 <br />• SILL SC,, SIL <br />1Fertilizer applications may be beneficial when soil test values occur at these levels. <br />However, phosphorus responses generally do not occur at the <br />moderate suitability level (Berg, 1980). <br />2Nitrogen fertilization is not recommended when organic matter levels are greater than 2.0 <br />percent (Barrett et al., 1980). <br />3Berg, 1980. <br />AHertzog, 1983. <br />SNDEO, 1985. <br />6 <br />S ut[on et al., 1981. <br />7 <br />Tiedemann and Lopez, 1982. <br />8 <br />USDA Forest Service, 1979. <br />9Texture abbreviations include: S-sand, LS-loamy sand, SL-sandy loam, SIL-silt loam, <br />L-loam, SCl-sandy clay loam, LL-clay loam, SICL-silty clay loam, SIC silty clay, <br />• SC-sandy clay, and C-clay. <br />11 <br />