LOCATION HYNES IDEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcids
TYPICAL PEDON: Hynes silt loam, cropland - on a 1 percent slope, at 4,180 feet elevation. (When described on October 12, 1993, the profile was dry throughout. Colors are for air-dry soil unless otherwise stated.)
A--0 to 4 inches; brown (10YR 5/3) silt loam, dark brown (10YR 4/3) moist; weak fine platy structure; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; many fine tubular pores; slightly alkaline (pH 7.4); clear smooth boundary. (2 to 6 inches thick)
Bk--4 to 16 inches; pale brown (10YR 6/3) silt loam, dark brown (10YR 4/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; common fine tubular pores; slightly effervescent (8 percent calcium carbonate equivalent); slightly alkaline (pH 7.8); clear smooth boundary. (4 to 14 inches thick)
Bkq--16 to 30 inches; very pale brown (10YR 7/3) silt loam, pale brown (10YR 6/3) moist; massive; hard, firm, slightly sticky and slightly plastic; common fine roots; few fine tubular pores; 25 percent durinodes; violently effervescent (20 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); abrupt smooth boundary. (10 to 20 inches thick)
B'k--30 to 41 inches; very pale brown (10YR 7/3) silt loam, yellowish brown (10YR 5/4) moist; moderate fine platy structure; hard, firm, slightly sticky and slightly plastic; few fine roots; few very fine irregular pores; violently effervescent (24 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); abrupt smooth boundary. (8 to 16 inches thick)
2C1--41 to 53 inches; very pale brown (10YR 7/3) silty clay loam, light yellowish brown (10YR 6/4) moist; moderate medium platy structure; very hard, firm, moderately sticky and moderately plastic; few very fine irregular pores; strongly effervescent (9 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); abrupt smooth boundary. (8 to 14 inches)
2C2--53 to 64 inches; very pale brown (10YR 7/3) silt loam, yellowish brown (10YR 5/4) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine irregular pores; strongly effervescent (6 percent calcium carbonate equivalent); moderately alkaline (pH 8.2).
TYPE LOCATION: Minidoka County, Idaho; about 800 feet west of the Hynes railroad siding; about 2,300 feet north and 800 feet west of the southeast corner of section 29, T.9S., R.22E.; Latitude - 42 degrees, 36 minutes, 40 seconds North; Longitude - 113 degrees, 53 minutes, 42 seconds West.
RANGE IN CHARACTERISTICS:
Depth to the 2C horizon - 40 to 60 inches
Depth to bedrock - more than 60 inches
Depth to the calcic horizon - 6 to 20 inches
Average annual soil temperature - 50 to 53 degrees F.
Particle-size control section:
Clay content - 6 to 15 percent
A horizon
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 2 or 3 dry or moist
Bk horizon
Value - 5 through 7 dry, 4 through 6 moist
Chroma - 2 or 3 dry or moist
Reaction - slightly or moderately alkaline
Bkq and B'k horizons
Value - 6 or 7 dry, 5 or 6 moist
Chroma - 2 or 3 dry or moist
Durinode content - 20 to 30 percent (in Bkq horizon)
Reaction - moderately or strongly alkaline
Calcium carbonate equivalent - 15 to 30 percent
2C1 horizon
Value - 6 through 8 dry, 5 or 6 moist
Chroma - 3 or 4 dry or moist
Texture - SIL, SICL
Clay content - 24 to 34 percent
Calcium carbonate equivalent - 10 to 30 percent
2C2 horizon
Value - 6 through 8 dry, 5 or 6 moist
Chroma - 3 or 4 dry or moist
Texture - SIL, VFSL
Clay content - 5 to 12 percent
Calcium carbonate equivalent - 5 to 15 percent
COMPETING SERIES: These are the Chijer and Portneuf series. Portneuf soils are silt loam throughout the profile and lack the 2C substratum. Chijer soils have loam texture in the particle-size control section.
GEOGRAPHIC SETTING: Hynes soils are on terraces. Slopes range from 0 to 2 percent. The soil formed in alluvium from mixed sources. Elevation ranges from 4,100 to 4,200 feet. The average annual precipitation is about 8 to 10 inches. The average annual air temperature is about 48 to 49 degrees F. The frost-free period is 130 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Portneuf and the Sluka soils. Sluka soils are moderately deep to a duripan. Portneuf and Sluka soils occur on higher terraces.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; slow permeability.
USE AND VEGETATION: Hynes soils are used for irrigated cropland. The principal crops grown are barley. potatoes, sugar beets and wheat.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
DISTRIBUTION AND EXTENT: Southcentral Idaho. This series is of small extent.
SERIES ESTABLISHED: Minidoka County, Idaho, 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface to 4 inches (A horizon)
Durinodic feature - the zone from 16 to 30 inches (Bkq horizon)
Calcic horizon - the zone from 16 to 41 inches (Bkq and B'k horizons)
Particle-size control section - the zone from 10 to 40 inches (part of the Bk, the Bkq, and part of the B'k horizons)