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in stratified recent alluvium along streams and rivers <br />throughout the survey area. <br />Included in this unit are numerous sand and gravel bars. <br />Some non-calcareous areas are also included. <br />Typically the surface layer is grayish brown sandy loam <br />about 4 inches thick. The underlying material, to a <br />depth of 60 inches, is light yellowish brown calcareous <br />sand stratified with thin lenses of sandy loam and <br />loam. <br />Permeability is moderately rapid and avilable water <br />ca-aacity is low. Effective rooting depth is 60 inches <br />or more. Surface runoff is slow and erosion hazard <br />is low. <br />These soils are suited to very limited cropping.. They <br />are sandy and subject to flooding. Pasture is the best <br />use for this soil, with tall wheatgrass, tall.fescue <br />and annual sweetclover some of the best suited crops. <br />Light frequent irrigations by furrows and flooding are <br />recommended. Commercial fertilizers improve the amount <br />and value of forage produced. <br />The potential native vegetation on this soil is dominated <br />by switchgrass, Indiangrass, sand bluestem, sand reed- <br />grass, sideoats grama, needle-and-thread and blue grama. <br />Much of this site has inclusions of other soils and <br />vegetation in such a complex pattern that it is hard to <br />map separately. Potential production ranges from 2500 <br />pounds per year in favorable years to 1500 pounds per <br />acre in unfavorable years. When range condition deterio- <br />rates, the tall and mid-grasses decrease, blue grama, <br />sand dropseed and forbs increase and production drops. <br />Undesirable weeds and annuals invade the site as range <br />condition becomes poorer. <br />Management of vegetation on this soil should be based on <br />taking half and leaving half of the total annual production. <br />Seeding is only adviable on areas large enough to prepare <br />a seedbed on or interseed with an interseeder. <br />Switchgrass, sand bluestem, sand reedgrass, sideoats grama, <br />little bluestem, blue grama, pubescent wheatgrass and <br />intermediate wheatgrass are suitable for seeding. For <br />successful seeding, use of an interseeder or a firm, <br />clean sorghum stubble -- prepared the growing season <br />prior to seeding -- and a grass drill are required. <br />Early spring seeding has proven most successful. <br />This soil is generally not suited to the establishment <br />and growth of trees and shrubs. On-site investigation, <br />is needed to determine feasibility and possible tree <br />and shrub species. <br />-9-