LOCATION TRUESDALE ID+OR UTEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Xereptic Haplodurids
TYPICAL PEDON: Truesdale fine sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; light brownish gray (10YR 6/2) fine sandy loam, dark grayish brown (10YR 4/2) moist; weak fine and very fine granular structure; soft, very friable; nonsticky and nonplastic; many very fine and fine roots;
slightly alkaline (pH 7.4); abrupt smooth boundary. (0 to 5 inches thick)
Bw--3 to 18 inches; light brownish gray (10YR 6/2) fine sandy loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine and fine roots; many very fine and fine pores; slightly effervescent; slightly
alkaline (pH 7.8); gradual smooth boundary. (8 to 16 inches thick)
Bk--18 to 24 inches; light brownish gray (10YR 6/2) fine sandy loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, firm; many very fine and fine roots; few fine tubular pores; 5 percent hard (cicada) krotovinas 0.5 to 1.5 inches across with lime splotches and coatings on the surface; few fine lime veins throughout; strongly effervescent; moderately alkaline (pH 8.2); abrupt smooth boundary. (4 to 20 inches thick)
2Bkqm--24 to 32 inches; light gray (10YR 7/2) duripan, grayish brown (10YR 5/2) moist; massive; hard, very firm, 3 to 5 thin (less than 2 mm) horizontal lenses of strong lime-silica cementation 0.5 to 3 inches apart and concentrated in the upper part; matrix weakly cemented and does not slake in HC1, but becomes friable; 30 percent of nodules or (cicada) krotovinas; few roots between plates; many very fine tubular
pores; violently effervescent with many lime splotches and veins; moderately alkaline (pH 8.4); clear smooth boundary. (6 to 12 inches thick)
2Bk--32 to 60 inches; light gray (10YR 7/2) sandy loam, grayish brown (10YR 5/2) moist; massive; hard, firm, slightly sticky and nonplastic; few very fine tubular pores; violently effervescent with common lime veins; strongly alkaline (pH 8.5).
TYPE LOCATION: Canyon County, Idaho; about 3.5 miles east of Homedale; 1880 feet west and 440 feet north of the SE corner section 5, T.3N., R.4W.
Latitude - 43 degrees, 37 minutes, 04 seconds North;
Longitude - 116 degrees, 50 minutes, 12 seconds West.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 49 to 54 degrees F
Depth to strongly to weakly cemented duripan - 20 to 40 inches
Depth to bedrock - 50 to over 60 inches
Depth to the calcic horizon (Bk) - 11 to 21 inches
Texture in particle-size control section - FSL, SL, COSL, GR-SL; total clay content is 10 to 18 percent, carbonate free clay is 5 to 15 percent.
A horizon
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 2 or 3
Reaction - neutral to moderately alkaline
Bw horizon
Value - 5 through 7 dry, 2 through 6 moist
Chroma - 2 through 4
Reaction - neutral to moderately alkaline
Bk horizon
Value - 6 through 8 dry, 4 through 6 moist
Chroma - 2 or 3
Calcium carbonate content - 15 to 40 percent
Reaction - moderately or strongly alkaline
2Bk horizon
Texture - SL, SIL, L
Rock fragments - 0 to 25 percent
Reaction - moderately or strongly alkaline
COMPETING SERIES: These are the Bliss, Eltopis, and Kodra series. These soils lack a calcic horizon above the duripan.
GEOGRAPHIC SETTING: Truesdale soils are in level to sloping medium and high terraces and basalt plains at elevations of 2,200 to 4,700 feet. Slopes range from 0 to 12 percent. The soils formed in alluvium or lacustrine sediments of mixed mineralogy and may have some eolian admixture. Average annual precipitation is 7 to 12 inches, including
0.5 to 2 feet of snow, and the average annual air temperature is 47 to 52 degrees F. Frost-free period is 100 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cencove, Letha, Minidoka, Nyssa, and Sagehill soils. Cencove soils have contrasting textures and lack duripans. Nyssa soils are coarse-silty. Sagehill soils lack duripans. Letha soils have high exchangeable sodium, lack a duripan, and are on low terraces. Minidoka, Cencove, and Nyssa soils are on landscape positions similar to Truesdale soils.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate permeability above the duripan.
USE AND VEGETATION: Used for rangeland and irrigated cropland. Principal crops are small grain, potatoes, vegetables, corn, sugar beets, alfalfa, pasture grasses, and a few orchards. Vegetation in the potential natural plant community is Wyoming big sagebrush, bluebunch wheatgrass, bottlebrush squirreltail, Thurber needlegrass, and Sandberg
bluegrass.
DISTRIBUTION AND EXTENT: Southwestern Idaho and eastern Oregon. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Payette County, Idaho, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 3 inches (A horizons).
Cambic horizon - the zone from 3 to 18 inches
Calcic horizon - the zone from 18 to 24 inches
Strongly cemented duripan - the zone from 24 to 32 inches (2Bkqm horizon).
Particle-size control section - the zone from 10 to 24 inches.