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flies <br />Tobin silty clay loam, 1 to 2 percent slopes. This deep, <br />well drained soil is on deeply dissected stream terraces arrd ire <br />dr-airrageways that previously had a shallow water taGle. It formed irr <br />fine-textured alluvium. Tt~e native vegetation is mainly grass. <br />Elevation is J,JL~~O to 7,500 feet. The average annual precipitation is <br />• 15 to 20 inches, ttie average annual air temperature is 4$ to ~2 <br />egrees F, and the average frost-free season is 120 to 140 days. <br />Typically, ttie surface is silty clay loam about 21 inches thick. <br />Gelc~w this to a depth of G0 inches or mare is silty clay Ioarn. Tt~e <br />sail is rnifdly all;alir~e to a depttr of 21 ir~ctres arrd moderately <br />all;alir~e below that depth. <br />Included in this unit are areas of soils that have a thinner, <br />dari;-colored surface layer. <br />F~errneaGility is moderate. Available water capacity is trigtr. <br />Runoff is slow, arrd the hazard of water erosion is high. This soil is <br />subject to r-ar•e arrd br- i of per• i ods of f I ood i ng i r~ the spr i n3 arrd summer <br />months. <br />Mast areas of this unit ar•e used for rangeland. A few areas are <br />used fc.r irrigated hay and pasture. <br />TY~e patent i a l p l art c ummur~ i ty orr tt~ i s unit i s ma i r~ l y western <br />wheatgrass and r~eedlegrass. Other plants that commonly grow on this <br />urn i t ar•e t~ I ue gr-arna, buffo I ograss, native b I uegrasses, arrd Ind i are <br />ricegr-ass. The average annual production of air-dry vegetation is <br />about 1,000 pounds per acre. When tt~e condition of the range <br />~ieter•ior-ates, bluegrass, cheatgr-ass, and curiycup gumweed increase. <br />Range seeding is suitable if the range is ire poor condition. If <br />this unit is used for irrigated tray and pasture, the main limitations <br />ar-e s I ow permeate i I i ty, f I ood i r.g, arrd the rr i gtr hazard of water eros i are. <br />Gecause of the slrw permeability of this soil, irrigation water should <br />tie applied at a slow rate over a long period to insure that the root <br />zr,ne is properly wetted, !_eveling trelps to_insure the uniform <br />• ~.pplicatic~r~ cif water. Natural soil fertility of the soil in this unit <br />s high. Irrigated craps respond to nitrogen arrd phosphorus <br />fertilizer-. Rotation grazing helps to mairrtair~ ttre quality of forage. <br />If prcrper-ly managed, this unit can produce 3.5 tons of irrigated <br />alfalfa tray per- acre. <br />This unit is wel I suited to wir~dbrea4:s and enviror~rner~tal <br />plar~tirrgs. Soil blowing care Ge reduced by cultivating only in the <br />tree rows arrd try leaving a Strip of vegetation between the rows. <br />Supplemental Irrigation may be needed when planting and during dry <br />periods. Among ttie trees that are suitable for planting are kussian- <br />otive, cottor~wr,od, arrd golden willow. Among ttre shrubs are <br />t~ur,eysuckle arrd caragarra'. <br />If this unit is used fur homesite development, the main <br />limitations are shrink-swell potential, flooding, and the hazard of <br />erosion. <br />This map unit is ire capability suGclasses IIs, irrigated, and <br />IIIc, r~or~ir•r-igated. It is in Clayey Foothills range site. <br />J <br />