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135 - Morapos loam, 12 to 25 percent slopes <br />Map Unit Setting <br />Major Land Resource Area: 48A <br />Elevation: 6,400 to 7,600 feet (1,951 to 2,316 <br />meters) <br />Mean annual precipitation: 16 to 18 inches (406 to <br />457 millimeters) <br />Average annual air temperature: 40 to 43 degrees F <br />(4.4 to 6.1 degrees C) <br />Frost -free period. 65 to 85 days <br />Map Unit Composition <br />Morapos and similar soils: 85 percent <br />Minor components: 15 percent <br />Component Descriptions <br />Morapos soils <br />Landform: Mountainsides <br />Parent material. Residuum derived from shale <br />Slope: 12 to 25 percent <br />Drainage Class: Well drained <br />Slowest permeability. .06 to 0.2 in./hr. (slow) <br />Available water capacity: About 9.1 inches (high) <br />Shrink -swell potential. About 7.5 percent (high) <br />Hazard of flooding: None <br />Morapos Series <br />Map Unit. 135 <br />Depth class: very deep <br />Drainage Class: well drained <br />Slowest permeability., .06 to 0.2 in./hr. (slow) <br />Landform: convex slopes on hills, mountainsides, <br />plateaus <br />Parent material., residuum derived from shale <br />Elevation: 6,400 to 7,600 feet (1,951 to 2,316 <br />meters) <br />Slope: 2 to 25 percent <br />Climatic data: <br />Mean annual precip: 16 to 18" (406 to 457mm) <br />Mean annual air temperature: 40 to 43 <br />degrees F (4.4 to 6.1 degrees C) <br />Frost -free period. 65 to 85 days <br />Taxonomic class: Fine, montmorillonitic Typic <br />Argiborolls <br />Typical Pedon <br />Map Unit in which located: Morapos-Pagoda <br />complex, 2 to 12 percent slopes <br />Al - 0 to 5 inches; grayish brown (10YR 5/2) clay <br />loam, very dark grayish brown (10YR 3/2) moist; <br />moderate fine granular structure; soft, friable, slightly <br />sticky and slightly plastic; neutral; clear wavy <br />boundary. <br />Btl - 5 to 9 inches; brown (10YR 5/3) clay loam, <br />dark grayish brown (10YR 3/3) moist; moderate fine <br />and medium angular blocky structure; very hard, <br />firm, very sticky and plastic; <br />common distinct lay films on faces of peds; neutral; <br />clear wavy boundary. <br />Bt2 - 9 to 23 inches; yellowish brown (10YR 5/4) <br />clay, dark yellowish brown (10YR 4/4) moist; strong <br />fine prismatic structure parting to strong medium <br />and coarse angular blocky; very hard, firm, very <br />sticky and very plastic; common distinct lay films on <br />faces of Peds; neutral: clear waw boundary. <br />Depth to seasonal high water table: Greater than 72 <br />inches Runoff class: Very high <br />Calcium carbonate maximum: About 3 percent <br />Gypsum maximum: None <br />Salinity maximum: About 2 mmhos/cm (nonsaline) <br />Sodium adsorption ratio: About 2 ( slightly sodic) <br />Ecological site: Mountain Loam <br />Potential native vegetation: Letterman's needlegrass, <br />mountain big sagebrush, mountain snowbeny, slender <br />wheatgrass, Saskatoon serviceberry, prairie junegrass, <br />western wheatgrass <br />Land capability subclass: (nonirrigated) 6e <br />Typical profile <br />0 to 10 inches - loam <br />10 to 28 inches - clay loam <br />28 to 60 inches - clay loam <br />Minor Components <br />Nortez and similar soils <br />Composition: About 8 percent <br />Campspass and similar soils <br />Composition: About 7 percent <br />Bkl - 23 to 31 inches; brown (10YR 5/3) clay loam, brown <br />(10YR 4/3) moist; moderate medium prismatic structure <br />parting to moderate coarse sub angular blocky; very hard, <br />firm, very sticky and very plastic; calcium carbonate <br />segregated as common white (10YR 8/1) threads; strongly <br />effervescent; moderately alkaline; clear wavy boundary. <br />Bk2 - 31 to 40 inches; pale brown (10YR 6/3) clay loam, <br />brown (10YR 5/3 moist; moderate medium prismatic <br />structure parting to weak coarse subangular blocky; hard, <br />firm, sticky and plastic; calcium carbonate segregated as <br />common white 10YR 8/1) threads; strongly effervescent; <br />moderately alkaline; gradual wavy boundary. <br />Bk3 - 40 to 53 inches; light gray (2.5Y 7/2) clay loam, light <br />yellowish brown (2.5Y 6/3 moist; weak coarse prismatic <br />structure; slightly hard, firm, sticky and plastic; calcium <br />carbonate segregated as common white (10YR 8/1) <br />threads; 11 percent calcium carbonate equivalent; <br />strongly effervescent; moderately alkaline; diffuse wavy <br />boundary. <br />Bk4 - 53 to 60 inches; light gray (2.5Y 7/2) clay loam, light <br />yellowish brown (2.5Y 6/3 moist; massive; slightly hard, <br />firm, sticky and plastic; many white (10YR 8/1) threads of <br />calcium carbonate; 7 percent calcium carbonate <br />equivalent; strongly effervescent; strongly alkaline. <br />Range in Characteristics <br />Depth to argillic horizon: 15 to 30 inches <br />Depth to secondary calcium carbonate: 14 to 30 inches <br />Thickness of the mollic epipedon: 7 to 15 inches <br />A horizon: <br />Reaction: neutral or mildly alkaline <br />Bt horizon: <br />Hue: 7.5YR to 10YR <br />Texture: clay loam, silty clay loam, or clay <br />Reaction: neutral or mildly alkaline <br />Bk horizons: <br />Hue: 10YR or 2.5Y <br />Texture: clay loam, silty clay loam, or clay <br />Reaction: moderately alkaline or strongly alkaline <br />