LOCATION AIRPORT UT+IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, mesic Aquic Natrixerolls
TYPICAL PEDON: Airport silty clay loam--pastureland. (Colors are for dry soil unless otherwise noted).
A--0 to 6 inches; gray (10YR 5/1) silty clay loam, very dark gray (10YR 3/1) moist; structure of the upper inch is weak thin platy, the remainder of this horizon has moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many fine roots; common medium vesicular pores; violently effervescent; moderately alkaline (pH 8.1); clear smooth boundary. (4 to 12 inches thick.)
Btkn--6 to 19 inches; gray (10YR 5/1) silty clay loam, very dark gray (10YR 3/1) moist; moderate medium prismatic structure parting to moderate medium and fine subangular blocky; hard, firm, moderately sticky and moderately plastic; few fine roots; few fine pores; common faint clay films on faces of peds; distinct masses of secondary carbonate; violently effervescent; 38 percent calcium carbonate equivalent; strongly alkaline (pH 8.5); clear smooth boundary. (6 to 15 inches thick.)
Bk1--19 to 32 inches; light gray (5Y 7/2) silty clay loam, olive gray (5Y 5/2) moist; moderate medium subangular blocky structure; extremely hard, very firm, very sticky and very plastic; few fine roots; few fine pores; organic coats on faces of peds; distinct masses of secondary carbonate; violently effervescent; 50 percent calcium carbonate equivalent; strongly alkaline (pH 8.8); clear smooth boundary. (9 to 16 inches thick.)
Bk2--32 to 40 inches; light gray (5Y 7/2) silty clay loam; olive gray (5Y 5/2) moist; weak medium subangular blocky structure; extremely hard, very firm, moderately sticky and moderately plastic; few fine roots; few fine pores; distinct masses of secondary carbonate; violently effervescent; 34 percent calcium carbonate equivalent; strongly alkaline (pH 8.8); clear smooth boundary. (0 to 30 inches thick.)
C--40 to 60 inches; very pale brown (10YR 7/3) silty clay loam, brown (10YR 5/3) moist; massive; very hard, firm, moderately sticky and moderately plastic; few fine pores; many medium faint yellowish brown (10YR 5/4) masses of iron accumulation; violently effervescent; 25 percent calcium carbonate equivalent; strongly alkaline (pH 8.5).
TYPE LOCATION: Davis County, Utah; about 2.5 miles west of Bountiful; approximately 1,585 feet west and 100 feet north of the southeast corner of section 22, T. 2 N., R. 1 W.; USGS Farmington 7.5 minute topographic quadrangle; 40 degrees 53 minutes 11 seconds north latitude and 111 degrees 56 minutes 8 seconds west longitude, NAD83; UTM zone 12N 421187E, 4526571N, NAD83.
RANGE IN CHARACTERISTICS:
Soil moisture - Typically moist in winter and spring, dry in summer and fall; the soils are dry in all parts of the moisture control section for more than 60 consecutive days following the summer solstice; Xeric moisture regime that borders on aridic.
Mean annual soil temperature - 47 to 54 degrees F.
Mollic epipedon thickness - 7 to 19 inches; includes the upper subhorizon of the natric horizon.
Particle-size control section - Clay content: 20 to 32 percent.
A horizon - Hue: 10YR or 2.5Y.
Value: 4 or 5 dry.
Chroma: 1 or 2, dry or moist.
Texture: Silt loam or silty clay loam.
Organic matter content: 1.5 to 6 percent.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent: 3 to 35 percent.
Exchangeable sodium: Commonly less than 15 percent, but ranges to 30 percent.
Btnk horizon - Hue: 10YR or 2.5Y.
Value: 3 or 4 moist on ped faces, 3 through 7 moist on ped interiors; crushed and smoothed material are 5 through 7 dry, 3 through 6 moist.
Chroma: 1 through 3, dry or moist.
Structure: Moderate prismatic but ranges to strong prismatic.
Clay films: Thin, nearly continuous in pedons with moderate grades of structure to distinct, continuous on all ped surfaces where structure is strong.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent: 25 to 40 percent.
Sodicity (SAR): 15 to 50.
Exchangeable sodium: 15 to 75 percent.
Bk horizons - Hue: 10YR through 5Y.
Value: 6 through 8 dry, 5 or 6 moist.
Chroma: 1 through 3, dry or moist.
Clay content: 20 to 30 percent.
Secondary carbonates: Finely disseminated or as masses.
Calcium carbonate equivalent: 25 to 50 percent.
Sodicity (SAR): 13 to 50.
Exchangeable sodium percentage: 15 to 75 percent.
C horizon - Hue: 10YR through 5Y.
Texture: Silty clay loam, silt loam, or fine sandy loam; stratified in many pedons.
Calcium carbonate equivalent: 15 to 35 percent.
Other features: Redoximorphic features occur at some depth between 30 and 45 inches.
COMPETING SERIES: There are currently no other series in this family.
GEOGRAPHIC SETTING: Airport soils are on lake plains, lake terraces, and stream terraces. These soils formed in calcareous lacustrine deposits derived from limestone, sandstone, shale, and quartzite. Slopes are 0 to 3 percent. The climate is dry subhumid. The mean annual precipitation is 12 to 17 inches. The mean annual temperature is 45 to 52 degrees F., the mean summer temperature is 66 to 72 degrees F., and the frost-free period is 120 to 175 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ford, Payson, Syracuse, and Warm Springs soils. Ford soils are coarse-loamy and are moderately deep to a cemented horizon. Payson soils are fine textured and have ochric epipedons. Syracuse soils are coarse-loamy and do not have natric horizons. Warm Springs soils are fine-loamy and do not have natric horizons.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; medium surface runoff; slow permeability (moderately low or moderately high saturated hydraulic conductivity). Endosaturation is present with an apparent seasonal high water table between 2.0 and 3.0 feet (moderately deep free water occurrence class) between April and September. Cumulative annual duration class is Common.
USE AND VEGETATION: Airport soils are used mostly used for pasture. Some areas have been drained, reclaimed, and are used for irrigated cropland. The native vegetation is dominantly inland saltgrass with some black greasewood and pickleweed. In Utah this series is correlated with Alkali bottom range sites.
DISTRIBUTION AND EXTENT: Northwestern Utah and southern Idaho. These soils are not extensive with about 7,300 acres of the series mapped to date. MLRA 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Salt Lake Area, Utah, 1936.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 19 inches (A and Btkn horizons).
Natric horizon - The zone from 6 to 19 inches (Btkn horizon).
Calcic horizon - The zone from 6 to 40 inches (Btkn, Bk1, and Bk2 horizons).
Aquic conditions - The conditions of endosaturation, reduction, and redoximorphic features between 19 and 40 inches at certain times during normal years (parts of the Bk1 and Bk2 horizons).
Particle-size control section - The zone from 6 to 19 inches (Btkn horizon).
In August 1994 the classification was changed from Typic Natraquoll to Aquic Natrixerolls. The 5Y hue and 2 chroma matrix in the 19 to 32 inch layer was interpreted to be redox depletions for placement in the Aquic subgroup.
The Davis-Weber soil survey area (UT607) includes a component that is a "shallow water table phase" and has ponding.
In the Box Elder County, Eastern Part soil survey area Airport is described as moderately well drained and the taxonomic unit classifies as a Typic Natrixeroll. These soils will be correlated to the Fridlo series.
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 136-137, Table 11 of the Soil Survey of Davis-Weber Area, Utah. The pH values in the typical pedon are from saturated paste.