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26 -Haverson loam, 1 to 3 percent slopes. This is a deep, well drained soil on low terraces and flood <br />plains at elevations of 4,500 to 4,800 feet. It formed in stratified calcareous alluvium. Included in <br />mapping are small areas of soils that have fine sandy loam and sandy loam underlying material and small <br />areas of soils that have sand and gravel within a depth of 40 inches. <br />Typically, the surface layer of this Haverson soil is grayish brown loam about 4 inches thick. The <br />underlying material, to a depth of 60 inches, is pale brown loam stratified with thin lenses of loamy sand <br />and clay loam. <br />Permeability is moderate. Available water capacity is high. The effective rooting depth is 60 inches or <br />more. Surface runoff is low to medium, and the erosion hazard is low. <br />In irrigated azeas this soil is suited to all crops commonly grown in the area, including corn, sugaz beets, <br />beans, alfalfa, small grain, potatoes, and onions. An example of a suitable cropping system is 3 to 4 years <br />of alfalfa followed by corn, corn for silage, sugaz beets, small grain, or beans. Land leveling, ditch lining, <br />and installing pipelines maybe needed for proper water applications. <br />All methods of irrigation are suitable, but furrow irrigation is the most common. Barnyard manure and <br />commercial fertilizer aze needed for top yields. <br />In nonirrigated areas this soil is suited to winter wheat, barley and sorghum. Most of the acreage is <br />planted to winter wheat. The predicted average yield is 28 bushels per acre. The soil is summer fallowed <br />in alternate years to allow moisture accumulation. Generally precipitation is too low for beneficial use of <br />fertilizer. <br />Stubble mulch fanning, stripcropping, and minimum tillage are needed to control soil blowing and water <br />erosion. Terracing also maybe needed to control water erosion. <br />The potential native vegetation is dominated by western wheatgrass. Blue grams, switchgrass, sand <br />reedgrass, big bluestem, slender wheatgrass, indiangrass, and green needlegrass aze also present. <br />Potential production ranges from 1,600 pounds per acre in favorable years to 1,000 pounds in unfavorable <br />years. As range condition deteriorates, the tall grasses decrease, blue grams and buffalograss increase, <br />and forage production drops. Undesirable weeds and annuals invade the site and erosion can occur as <br />range condition becomes poorer. <br />Management of vegetation on this soil should be based on taking half and leaving half of the total annual <br />production. Seeding is desirable if the range is in poor condition. Western wheatgrass, switchgrass, sand <br />reedgrass, sideoats grams, pubescent wheatgrass, intermediate wheatgrass, and blue grams are suitable for <br />seeding. The grass selected should meet the seasonal requirements of livestock. It can be seeded into a <br />firm prepared seedbed. A grass drill should be used. Seeding early in the spring has proven most <br />successful. <br />Windbreaks and environmental plantings are well suited to this soil. Flooding and moisture competition <br />from grass and weeds are the principal hazards in establishing tree and shrub plantings. Summer <br />fallowing a year in advance in nonirrigated areas and continued cultivation for weed control are needed to <br />insure establishment and survival of plantings. Supplemental imgation may be needed. Trees that are <br />