LOCATION MEDBURN UT+NVEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, calcareous, mesic Xeric Torriorthents
TYPICAL PEDON: Medburn fine sandy loam--rangeland. (Colors are for air-dry soil unless otherwise noted.)
A1--0 to 5 inches; pale brown (10YR 6/3) fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak thick platy structure; soft, friable, slightly plastic; few very fine roots; few fine pores; strongly effervescent; carbonates are disseminated; strongly alkaline (pH 8.6); clear smooth boundary. (1 to 11 inches thick)
A2--5 to 7 inches; pale brown (10YR 6/3) fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; soft, friable, slightly plastic; few very fine roots; few fine pores; strongly effervescent; carbonates are disseminated; strongly alkaline (pH 8.7); abrupt smooth boundary. (0 to 17 inches thick)
C1--7 to 21 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 4/3) moist; massive; soft, very friable, and slightly plastic; few very fine roots; few fine pores; strongly effervescent; carbonates are disseminated; strongly alkaline (pH 8.6); gradual wavy boundary. (3 to 14 inches thick)
C2--21 to 35 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 5/3) moist; massive; soft, very friable, and slightly plastic; few fine and very fine pores; strongly effervescent; carbonates are disseminated; moderately alkaline (pH 8.4); gradual wavy boundary. (6 to 18 inches thick)
C3--35 to 60 inches; light yellowish brown (10YR 6/4) loam, brown (10YR 5/3) moist; massive; slightly hard, friable, slightly sticky and moderately plastic; few fine and very fine pores; strongly effervescent; carbonates are disseminated; strongly alkaline (pH 8.6).
TYPE LOCATION: Juab County, Utah; about 1/4 mile southeast of Sand Dunes picnic area; near the center of sec. 32, T. 12 S., R. 1 E.
RANGE IN CHARACTERISTICS:
Soil moisture: Dry in all parts of the moisture control section for 50 to 60 percent of the time that soil temperature is above 41 degrees F. at a depth of 20 inches. The soil moisture regime is aridic bordering on xeric.
Mean annual soil temperature: 47 to 52 degrees F.
Mean summer soil temperature: 68 to 71 degrees F.
Reaction: Moderately alkaline or strongly alkaline throughout
Calcium carbonate equivalent: 3 to 40 percent throughout
Particle-size control section (weighted average):
Clay content: 5 to 18 percent
A horizon:
Hue: 10YR or 7.5YR
Value: 5 to 7 dry, 3 to 6 moist
Chroma: 2 to 6; Where the dry value is 5 and moist value is 3, the horizons are 4 inches or less thick and chroma is 4 or more.
EC (mmhos/cm): 0 to 4 mmhos/cm
Rock fragments: 0 to 15 percent
Effervescence: Strongly effervescent or violently effervescent
Bw horizons (when present) and C horizon:
Hue: 7.5YR, 10YR or 2.5Y
Value: 5 to 8 dry, 4 to 7 moist
Chroma: 2 to 6
Texture: Fine sandy loam, sandy loam or loam. Thin lenses of loamy sand or sandy clay loam may occur in the particle-size control section, and thin lenses of silt loam to sand may occur below the control section.
Consistence: Soft or slightly hard dry, very friable or friable moist, nonsticky or slightly sticky and nonplastic to moderately plastic
Rock fragments: Gravel or cobbles range from 0 to 25 percent, but average less than 20 percent above a depth of 40 inches and range from 0 to 50 percent below depth of 40 inches.
Effervescence: Strongly effervescent or violently effervescent
EC (mmhos/cm): 0 to 16 mmhos/cm.
Exchangeable sodium percentage (ESP): 0 to 30
COMPETING SERIES: These are the Pengpong(NV), Perwick (NV) and Turbyfill (ID) series. Pengpong soils the fine earth fraction is made up dominantly of spheroidal aggregates of eolian origin and contains broken sand-sized shell fragments. Perwick soils have bedrock at a depth of 20 to 40 inches. Turbyfill soils have visible secondary carbonates in the series control section.
GEOGRAPHIC SETTING: Medburn soils are at elevations of 4,500 to 6,800 feet. They are on alluvial fans, fan remnants, inset fans, alluvial flats, and dissected lake plains. Slopes range from 0 to 8 percent. They formed in alluvium and lacustrine sediments derived dominantly from igneous and sedimentary rock. The climate is semiarid. Mean annual temperature is 45 to 54 degrees F. and the mean summer temperature is 67 to 71 degrees F. The freeze-free period is 100 to 140 days. Average annual precipitation is 8 to 12 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ashdown, Denmark, Genola, Linoyer, Pibler, Pober, Sierocliff, and Spager and Wales soils. Genola soils are fine-silty. Ashdown and Wales soils are fine-loamy. Linoyer soils are coarse-silty. Denmark, Pibler, Pober, Sierocliff and Spager soils have petrocalcic horizons.
DRAINAGE AND PERMEABILITY: Well drained or somewhat excessively drained; very low and low runoff; moderate or moderately rapid permeability.
USE AND VEGETATION: Medburn soils are used for livestock grazing, but also for production of irrigated and nonirrigated alfalfa and grain. Potential vegetation is big sagebrush, cheatgrass, bluebunch wheatgrass, galleta grass, and blue grama. In saline-alkaline areas native vegetation is alkali sacaton, threeawn and black greasewood.
DISTRIBUTION AND EXTENT: Moderately extensive in southwestern and central Utah. MLRA 28A and 28B.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Juab County (Fairfield-Nephi Soil Survey Area), Utah, 1980.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from the soil surface to a depth of 7 inches. (A1 and A2 horizons)