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<br />''I'''"" <br /> <br /> <br />Soi 1s - Group III [Yellow] <br />Irrigated cropland on floodplains and <br />alluvial fans. <br /> <br />Map Unit 27 - Typic Psammaquents--Typic Natrargids, loamy--Aquic Nat- <br />rargids, loamy, nearly level. <br /> <br />This map unit constitutes 3.3 percent of the basin. <br />unit occupy sl ightly depressed flood plains and low <br />Basin floor. The soils are formed in mixed fine to <br />sandy alluvium. <br /> <br />The soils in this <br />alluvial fans on the <br />coarse textured <br /> <br />Elevation is about 7,500 feet (2,286 m). Slopes are 0 to 2 percent. <br />The average annual precipitation is about 7 inches (0.18 m). The mean <br />annual soil temperature is about 45 degrees F. (7.20 C) and the frost <br />free season is approximately 95 days. This map unit covers about 158,000 <br />acres (63,943 naJ - 247 square miles (640 km2). <br /> <br />This map unit is used as irrigated cropland and rangeland. Native <br />vegetation is greasewood, rabbitbrush, alkali sacaton and saltgrass. <br />Alfalfa, potatoes and barley are the most extensively grown irrigated <br />crops. Some irrigated areas have only grass-sedge pasture. <br /> <br />,..,~ <br /> <br />..........., AI <br /> <br />A <br /> <br />A-8 <br />