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! ~' =~ <br />-Altvan loam, 0 to 1 percent slopes ~ F..,._'~•i <br />This 19 s deep, well drained soil on terraces at elevations of 4500 <br />to 4900 feet. IC formed in old alluvium from material deposited by <br />the major rivers in the western part of the sur.•ey area. <br />Included in this unit are some soils with clay loam subsoils and some <br />soils with evidence of poor drainage, Also included are some long <br />narrow streaks of sand and gravel cicposits. <br />Typically the surface layer i.s grayish brown ]o;~in about 10 inches <br />thick. The subsoil is brown to l~gtit yellowish brown clay loam and <br />sandy clay loam about 15 inches thick. Ttie sub~rratnm is calcareous <br />loamy sand or sandy loam about G inches thick n~•er sand and gravel. <br />Depth Co sand and gravel ranges from 20 to 40 in.6,a. <br />Permeability is modarate and available water oip.uity is moderate. <br />tiffective roofing depth is 20 to 40 tuches. Surface runoff is slow <br />and erosion hazard is low, <br />This soil is used almost entirely for irrigation and is suited to <br />all crops adapted to this area, including corn, s~igar beets, beans, <br />alfalfa, small grains, potatoes and onions. An r~.tirple of a suitable <br />cropping system is alfalfa 3 to 4 years followed b}• corn, corn for <br />silage, sugar beets„ small grain, beans and back to alfalfa. The <br />soil normally has some slight res[r[ctions for snr,:e crops such as high <br />clay content or rapidly permeable suhstratums. <br />All methods of irrigation are suiW ble with Eurrcw irrigation [hc most <br />common type used, Proper irrigation vator manag,~r~~nt is rssential. <br />r <br />