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Bt horizon has hue of 2.5Y through 5YR, value of 4 through 6 dry, 4 or 5 moist, and
<br />• chroma of 3 through 6. It is typically clay loam or sandy clay loam and has 18 to 35
<br />percent clay. Soil reaction is neutral through moderately alkaline.
<br />Bk horizon has hue of 2.5Y through SYR, value of 5 through 8, 4 through 7 moist, and
<br />chroma of 1 through 6. It has common, medium to coarse, soft to hard, lime bodies and
<br />lime pendants on pebbles as well as disseminated lime. Texture is loam or sandy clay
<br />loam. Calcium carbonate equivalent ranges from 15 to 35 percent. Some pedons have a
<br />thin paralithic layer above the bedrock.
<br />COMPETING SERIES: These are the Balon, Banc, Bowbac, Buckle, Cambria, Cerrillos,
<br />Clovis, Cushman, Fattia, Fernando, Decolnev, Flaco, Forkwood, Fort Collins, Gaddes,
<br />Gapbutte(T), Hagerman, Harbord, Hiland, Los Alamos, Ma~dorf, Millet, Oeloa, Olnev,
<br />Palacid, Penistaia, Pokeman, Potts, Pugsley, Scholle, S an ler, Spenlo, Stoneham,
<br />Sundance, Taoia, Threetoo, Toluca, Tuweea, and Yenlo series. Balon, Banc, Bowbac,
<br />Buckle, Cambria, Cerrillos, Clovis, Decolney, Fernando, Forkwood, Fort Collins,
<br />Gaddes, Harbord, Hiland, Los Alamos, Mavsdorf, Millett, Oelop, Olney, Palacid,
<br />Penistaja, Pokeman, Potts, Pugsley, Scholle, Spenlo, Stoneham, Tapia, Toluca,
<br />Tuweep, and Yenlo soils lack lithic contacts within depths of 40 inches. Cushman and
<br />Hagerman soils lack a calcic horizon below the argillic horizon. Fattig soils have chroma
<br />of 1 in the Bt horizon. Flaco soils have mean annual soil temperatures greater than 52
<br />degrees F. Gapbutte soils have less than 15 percent calcium carbonate equivalent.
<br />Spangler soils have a paralithic contact above depths of 40 inches. Sundance soils have
<br />lithologic discontinuities. Threetop soils have soil moisture control sections that are moist
<br />• in some or all parts in May and June.
<br />GEOGRAPHIC SETTING: Progresso soils are on old terraces, benches, mesas, and
<br />upland hills and ridges. The soil formed in alluvium derived from sandstone or limestone.
<br />Slopes range from 0 to 15 percent. Elevation ranges from 5,300 to 6,800 feet. The mean
<br />annual precipitation ranges from 12 to 15 inches. Mean annual air temperature ranges
<br />from 45 to 49 degrees F. In Arizona mean annual air temperatures reach 57 degrees F.,
<br />mean annual precipitation is as low as 10 inches, and the frost-free period extends to
<br />165 days. The average frost-free period ranges from 90 to 130 days.
<br />GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Barx soils and
<br />the Pinon soils. Pinon soils have hard bedrock at depths above 20 inches.
<br />DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate
<br />permeability.
<br />USE AND VEGETATION: This soil is used mainly for rangeland. A few areas are
<br />irrigated and produce corn for silage, small grains, alfalfa, and grass hay. Native
<br />vegetation consists mainly of galleta, Indian ricegrass, needleandthread, and Wyoming
<br />big sage.
<br />DISTRIBUTION AND EXTENT: Western Colorado, northern Arizona and adjacent parts
<br />of New Mexico. The series is of moderate extent.
<br />• (REVISED 9/99) 2.04.9-51
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