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<br />I' <br />., <br />I' <br />J, <br />1 <br />I, <br />1: <br />I; <br />J <br />I <br />t <br />t <br />I <br />- <br />" <br />I <br />I <br />I <br />I <br /> <br />2029 <br /> <br />summarizes the impact of irrigation water salinity on potential <br /> <br />grain corn yield based on anticipated irrigation water sources for <br /> <br />the Ute Indian reservations identified in Section 4 (see Table 4.1). <br />Salt concentrations in these water sources vary markedly with <br /> <br /> <br />salinity levels being within acceptable limits on all but the Mancos <br /> <br /> <br />River. Mancos River water (2278 micromhos/cm) has the potential to <br /> <br /> <br />reduce estimated grain corn yields (20 percent) previously <br /> <br /> <br />summarized in Table 6.20. <br /> <br />Crop cultural practices for grain corn are summarized in Table 6.22. <br /> <br />These cultural practices are used in each climatic zone judged <br /> <br />suitable for grain corn production. Fertility requirements <br />summarized in Table 6.23 will vary in each climatic zone. <br /> <br />6.2.5 Silage Corn <br />Silage corn is a major feed crop in Colorado. Based on Colorado <br />A.gricultural Statistics published by the Colorado Department of <br /> <br />Agriculture, Colorado ranked eleventh in the United States in silage <br /> <br />corn production during 1984 with approximately 3,454,000 tons <br />harvested from about l57,000 acres. The 1984 average yield in <br />Colorado was about 22 tons per acre. Areas planted to corn for <br />silage production in Montezuma and La Plata counties in Southwest <br />Colorado totaled about 4,000 and 12,900 acres, respectively. <br />Silage corn can be grown as both an irrigated and dryland crop in <br />Colorado. However, successful dryland silage corn production is <br />limited to areas with sufficient spring and summer rainfall which is <br /> <br />6- 34 <br />