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• <br />• <br />• <br />TABLE 92.3 <br />Recommended Fertility Levels for Native end <br />Improved Range Grasses <br />Suitability Level <br />Parameter Excellent Hiah Nodera[e1 Low1 Reference <br />pH <br />Organic Matter, X <br />Ammonium, ppm2 <br />Nitrate, ppm2 <br />Phosphorus, ppm <br />(NaHC03) <br />9 <br />Texture <br />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 />>2.5 1.6-2.5 0.6-1.5 0-0.5 2,8 <br />>15 10-15 5-9 0-4 3,6 <br />>12 7.12 3-6 0-2 2,3,4,6 <br />>10 7.10 4-6 0-3 3,6 <br />SILL SL CL,SCL S,LS,C 8 <br /> SI CL SC, SIC <br />1 <br />Fertilizer 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 />2 <br />Nitrogen fertilization is not recommended when organic matter levels are greater than 2.0 <br />percent (Barrett et aL., 1980). <br />3Berg, 1980. <br />4 <br />Hartzog, 1983. <br />5 <br />YDEO, 1985. <br />6 <br />Sutton et el., 1981. <br />7 <br />Tiedemann and Lopez, 1982. <br />8 <br />USDA Forest Service, 1979. <br />9 <br />Texture abbreviations include: S-sand, LS-loamy sand, SL-sandy loam, SIL-silt loam, <br />L-loam, SCL-sandy clay loam, CL-clay loam, SI CL-silty clay loam, SIC-silty clay, <br />SC-sendy clay, and C-c(ay. <br />10 <br />