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Table 91-2 <br />Recommended Fertility Levels for Native and <br />Improved Range Grasses <br />________________SUitability_Level____ <br />Parameter ________ __E xcellen[ _ __Hiyh__ ___MOderatel ____LOwI____ 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-b 0-3 2,3,6 <br />(NaHC03) <br />9 <br />Texture SILL SL CL,S[L S,LS,C 8 <br />SILL SL.SIC <br />Fertilizer applications may be beneficial when soil test values occur at these levels. <br />1 <br />However, phosphorus responses generally do not occur at the moderate suitability level <br />(Berg, 1980). <br />2Nitrogen fertilization is not recommended when organic matter levels are greater than <br />2.0 percent (Barrett et al., 1980). <br />3 <br />Berg, 1980. <br />4 <br />Hertzog, 1983 <br />5 <br />WDEO, 1985 <br />b <br />Sutton, et al., 1981 <br />7 <br />Tiedemann and Lopez, 1982 <br />8 <br />USDA Forest Service, 1979 <br />9 <br />Texture codes are: S-sand, LS-loamy sand, SL-sandy loam, SIL-silt loam, L-loam, SILL-silty <br />clay loam, SCL-sandy clay loam, CL-clay loam, SC-sandy clay, SIC silty clay, C-clay. <br />1r\' <br />u <br />., <br />21 <br />