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. Soil Unit 86- Vona fine sandy loam, 1 to 5% slopes. This deep, well drained soil is on <br />undulating uplands. It formed in eolian sand. The native vegetation is mainly grass. <br />Elevation is 5500 to 6200 feet. The average annual precipitation is 12.to 15 inches, the <br />average annual temperature is 50 to 54 degrees F, and the average frost-free period is 130 <br />to 160 days. <br />Constantly, the surface layer is light brownish gray fine sandy loam about 6inches thick. <br />The subsoil is sandy loam about 26 inches thick. The substratum to a depth of 60 inches <br />or more is sandy loam. The soil is neutral to a depth of 17 inches and moderately alkaline <br />below that depth. <br />In addition to the above soil about 10% Olney sandy loam can be found in the <br />drainageways. Permeability of this Vona soil is moderately rapid. Available water capacity <br />is moderate. Effective rooting depth is 60 inches or more. Runoff is slow to medium, and <br />the hazard of water erosion is slight to high. Erosion due to wind is considered very high <br />on ridges because of the short, undulating slopes and droughtiness. <br />This unit is used as rangeland in the permit boundary. The potential plant community on <br />this unit is mainly blue grams, needleandthread, Indian ricegrass and sideoats grams. The <br />average annual production of air-dry vegetation is about 1000 pounds per acre. If the <br />condition of the range deteriorates, sand dropseed, threeawn, and Russian-thistle <br />increase. <br />C~ <br />• <br />