LOCATION STINGAL UTEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, active, mesic Sodic Calcixerepts
TYPICAL PEDON: Stingal loam--nonirrigated cropland. (Colors are for dry soil unless otherwise noted.)
Ap1--0 to 2 inches; light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist; moderate medium platy structure parting to thin platy; soft, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine vesicular pores; strongly effervescent; 7 percent calcium carbonate equivalent; strongly alkaline (pH 8.6); abrupt smooth boundary. (2 to 8 inches thick)
Ap2--2 to 6 inches; light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist moderate thick and medium platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine roots; many fine continuous tubular pores; strongly effervescent; 8 percent calcium carbonate equivalent; strongly alkaline (pH 8.6); abrupt smooth boundary. (3 to 7 inches thick)
Bw1--6 to 13 inches; very pale brown (10YR 7/3) loam, brown (10YR 4/3) moist; weak coarse prismatic structure parting to medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common fine discontinuous pores; violently effervescent; 16 percent calcium carbonate equivalent; strongly alkaline (pH 8.6); gradual smooth boundary. (5 to 11 inches thick)
Bw2--13 to 25 inches; very pale brown (10YR 7/3) loam, grayish brown (10YR 5/2) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; few very fine roots; common fine discontinuous pores; few krotovina 10 to 15 mm. in diameter; violently effervescent; 22 percent calcium carbonate equivalent; strongly alkaline (pH 8.8); abrupt irregular boundary. (0 to 12 inches thick)
Bkn1--25 to 34 inches; very pale brown (10YR 8/3) loam, light brownish gray (2.5Y 6/2) moist; weak medium subangular blocky structure; hard, friable, nonsticky and nonplastic; few very fine roots; common fine and few medium discontinuous pores; violently effervescent; 32 percent calcium carbonate equivalent; very strongly alkaline (pH 9.4); abrupt irregular boundary. (5 to 16 inches thick)
Bkn2--34 to 48 inches; very pale brown (10YR 8/2) loam, light brownish gray (2.5Y 6/2) moist; weak medium subangular blocky structure; hard, very friable, slightly sticky and nonplastic; few very fine roots; few very fine discontinuous pores; violently effervescent; 31 percent calcium carbonate equivalent; very strongly alkaline (pH 9.4); clear smooth boundary. (5 to 16 inches thick)
Cn--48 to 65 inches; pale yellow (2.5Y 8/2) very fine sandy loam, light brownish gray (2.5Y 6/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; few very fine discontinuous pores; violently effervescent; 32 percent calcium carbonate equivalent; very strongly alkaline (pH 9.4); clear smooth boundary.
TYPE LOCATION: Box Elder County, Utah; about 5 miles west of Promontory and about 0.5 miles south of Cedar Spring; approximately 1,800 feet east and 175 feet south of the northwest corner of section 4, T. 10 N., R. 7 W.; USGS Lake Ridge 7.5 minute topographic quadrangle; 41 degrees 37 minutes 50 seconds north latitude and 112 degrees 39 minutes 28 seconds west longitude, NAD27; UTM zone 12N 361844E, 4610083N, NAD83.
RANGE IN CHARACTERISTICS:
Soil moisture - The soils are usually dry in all parts of the moisture control section during the period the soil temperature is above 41 degrees F. and are continually dry for 60 to 90 consecutive days in all parts of the moisture control section during the summer; They are moist for 60 to 90 consecutive days during the winter; Aridic moisture regime that borders on xeric.
Mean annual soil temperature - 49 to 51 degrees F.
Ochric epipedon thickness - 5 to 11 inches.
Particle-size control section - Clay content: 10 to 15 percent.
Ap horizons - Value: 3 or 4 moist.
Chroma: 2 or 3, dry or moist.
Reaction: Slightly alkaline through strongly alkaline.
Effervescence: Slightly effervescent or strongly effervescent.
Calcium carbonate equivalent: 5 to 10 percent.
Bw horizons - Hue: 10YR or 2.5Y.
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 2 or 3, dry or moist.
Texture: Loam, silt loam, or very fine sandy loam.
Reaction: Slightly alkaline through strongly alkaline.
Calcium carbonate equivalent: 15 to 25 percent.
Bkn horizons - Hue: 10YR through 5Y.
Value: 6 through 8 dry, 4 through 7 moist.
Chroma: 2 through 4, dry or moist.
Texture: Silt loam, loam, very fine sandy loam, or fine sandy loam.
Reaction: Strongly alkaline or very strongly alkaline (up to pH 9.6).
Salinity (EC): 2 to 8 mmhos/cm.
Sodicity (SAR): 12 to 40.
Calcium carbonate equivalent: 15 to 25 percent and may not decrease as much as 5 percent with depth in the Cn horizons.
Other features: Some pedons have 10 to 30 percent gravel below a depth of 26 inches; exchangeable sodium percentage (ESP) is more than 15 percent within 40 inches of the soil surface.
COMPETING SERIES: This is the Pogal series.
Pogal soils have electrical conductivities that are more than 8 mmhos/cm within 40 inches of the soil surface.
GEOGRAPHIC SETTING: Stingal soils are on low-level and intermediate-level lake terraces that are somewhat undulating or dissected in places. These soils formed in lacustrine deposits derived from calcareous sedimentary rocks such as limestone and sandstone. In places these deposits have been reworked by wind. Slopes are 1 to 10 percent. Elevations range from 4,300 to 5,200 feet. The climate is dry, subhumid with cool, moist winters and warm, dry summers. The mean annual temperature is 47 to 51 degrees F. and the average summer temperature is about 70 degrees F. The mean annual precipitation is 12 to 14 inches. The frost-free period is 100 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Eccles, Mellor, Palisade, Sanpete, and Windmill soils. Eccles and Palisade soils are coarse-loamy. Mellor soils have natric horizons. Sanpete soils have 50 to 75 percent gravel and more than 40 percent calcium carbonate in the particle-size control section. Windmill soils have more than 35 percent coarse fragments in the particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained; low or medium surface runoff; moderate permeability.
USE AND VEGETATION: Stingal soils are used as nonirrigated cropland and some native pasture. The dominant native vegetation is bluebunch wheatgrass. This series is correlated with an Upland rangeland ecological site.
DISTRIBUTION AND EXTENT: Northwestern Utah. These soils are moderately extensive. MLRA 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Box Elder County (Eastern Part), Utah, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 6 inches (Ap1 and Ap2 horizons).
Cambic horizon - The zone from 6 to 25 inches (Bw1 and Bw2 horizons).
Calcic horizon - The zone from 25 to 48 inches (Bkn1 and Bkn2 horizons).
Particle-size control section - The zone from 10 to 40 inches (Bw2 and Bkn1 horizons and part of the Bw1 and Bkn2 horizons).
This revision of April 2005 updates the taxonomic class from Coarse-silty, mixed, superactive, mesic Xeric Haplocambids based on estimated soil properties for cation exchange capacity and sodium adsorption ratio in the NASIS database, field observation at the typical pedon for the series that recognized a calcic horizon, use as dry cropland, and correlation to an Upland rangeland ecological site.
ADDITIONAL DATA: The typical pedon at the series type location has partial characterization data by the Soils Laboratory from Utah State University (USU) Logan, UT and is published on pages 214-215, Table 9 of the Soil Survey of Box Elder County, Utah, Eastern Part.