Laserfiche WebLink
Section 779.21 (a) Continued. <br />• Nutrient Starus of Soil Analyses in the Permi^ Area. <br />The parameters listed by Ludwick, et. al. (1976) as being important <br />for dryland grass production under rangeland conditions are examined <br />below. <br />Nitrate-Nitrogen. A total of 90 samples were analyzed for nitrate- <br />nitrogen on the permit area. Heil (1978) reported, of 13 samples <br />taken on Mine No. 1, values ranged from a low of 19 ppm to a high <br />of 55 ppm with an average of 29.4 ppm. U.S. Department of Agri- <br />culture researchers, found nitrate-nitrogen levels to average 14.5 <br />ppm, with a range from 5.1 ppm to 44 ppm. On the C-20900 Lease in <br />Mine No. 2, values averaged 17.1 ppm, with a range of 6.6 ppm to <br />40.2 ppm. In the Eckman Park area values ranged from 0.7 ppm to <br />75.3 ppm, with an average of 15.9 ppm. <br />• Ludwick, et. al. (1975) reported that all of the soils sampled at <br />the Colorado State University Soils Testing Laboratory had values <br />in excess of 50 ppm are rare. The N03-N levels sampled on the <br />permit area fall within the range reported by CSU. These researchers <br />reported that supplemental nitrogen fertilizer would not be necessary <br />for range uses with the present fertility levels encountered on the <br />permit area. <br />Ammonium-Nitrogen. Only twenty samples in the C-20900 Lease area <br />of Energy Mine No. 2 have been analyzed for aimnonium-nitrogen. <br />Values in this area ranged from 1.4 ppm to 5.1 ppm, with an average <br />of 3.0 ppm. These values appear to be so~~~ewhs.t normal for soils <br />found in the western United States (Dollhopf et al., 1977, and <br />Power et al., 1974). <br /> Percent Organic Matter. A total of 105 samples were analyzed for <br /> percent organic matter. Heil (1976) fou nd a range of 0.4 to 6.5 <br />. percent with an average of 2.84 percent for topsoils. Heil (1978) <br />779-295 <br />