LOCATION YRIBARREN CAEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Typic Haplargids
TYPICAL PEDON: Yribarren clay loam, on a gently sloping area of two percent slope under red brome, filaree, annual bluegrass, and Atriplex spp., at 495 feet elevation. (Colors are for dry soil unless otherwise stated. When described 3/16/76, the soil was dry).
A--0 to 7 inches; pale brown (10YR 6/3) clay loam, brown (10YR 4/3) moist; moderate coarse angular blocky structure parting to medium platy; slightly hard, friable, moderately sticky and moderately plastic; many very fine roots; few fine and common very fine tubular pores; violently effervescent, carbonates disseminated; moderately alkaline (pH 8.0); abrupt smooth boundary. (2 to 8 inches thick)
Bt--7 to 15 inches; pale brown (10YR 6/3) silty clay, brown (10YR 4/3) moist; moderate mediuim subangular blocky structure; hard, friable, very sticky and very plastic; many very fine roots; common fine and many very fine tubular pores; common thin clay films in pores and on faces of peds; violently effervescent, carbonates disseminated; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 8 inches thick)
Btk--15 to 19 inches; light yellowish brown (10YR 6/4) silty clay, brown (10YR 4/3) moist; strong medium prismatic structure parting to moderate medium subangular blocky; hard, friable, very sticky and very plastic; few very fine roots; few fine and common very fine tubular pores; many thin clay films in pores and on faces of peds; violently effervescent, carbonates disseminated and segregated as many fine irregular seams; segregated gypsum crystals as many fine irregular seams and soft masses; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 22 inches thick)
C1--19 to 22 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots, many very fine interstitial pores; violently effervescent, carbonates disseminated; segregated gypsum crystals as few fine irregular seams; moderately alkaline (pH 8.0); abrupt wavy boundary. (3 to 13 inches thick)
2C2--22 to 49 inches; very pale brown (10YR 7/3) silty clay, brown (10YR 4/3) moist; massive; slightly hard, very friable, very sticky and very plastic; few very fine roots; common very fine tubular pores; violently effervescent, carbonates disseminated; segregated gypsum crystals as few fine irregular seams; moderately alkaline (pH 8.0); clear wavy boundary. (20 to 27 inches thick)
2C3--49 to 60 inches; pale brown (10YR 6/3) silty clay, brown (10YR 4/3) moist; massive; hard friable, very sticky and moderately plastic; few very fine roots; few very fine tubular pores; violently effervescent, carbonates disseminated and segregated as few fine irregular seams; moderately alkaline. (pH 8.0).
TYPE LOCATION: Kern County, California; about 1.5 miles southeast of Highway 33 and Twisselman Road intersection; about 1,200 feet south and 250 feet west of the northeast corner of section 33, T. 25 E., R. 19 E., MDB&M; Latitude 35 degrees, 42 minutes, 47 seconds north and Longitude 119 degrees, 55 minutes, 17 seconds west; USGS Emigrant Hill Topographic Quadrangle, NAD 27.
RANGE IN CHARACTERISTICS: The soil between the depths of 4 to 12 inches is usually dry from mid-April until early December and usually is moist in some or all parts for less than 70 consecutive days. The mean annual soil temperature is 66 degrees to 69 degrees F.
66 degrees to 69 degrees F.
The A horizon has color of 10YR 5/3, 6/3, 6/4, 7/3 or 7/4. Moist color is 10YR 4/2, 4/3, 5/3 or 5/4. Texture is loam or clay loam. Clay content is 20 to 35 percent. Structure is platy, angular and subangular blocky. Electrical conductivity is 0.5 to 4 decisiemens per meter. Sodium adsorption ratio is less than 9.
The Bt horizon has color of 10YR 5/4, 6/3, 6/4, 7/2, 7/3 or 7/4. Moist color is 10YR 4/3, 5/3, 4/4, 5/4, 6/3 or 2.5Y 5/4. Texture is silty clay, heavy clay loam or clay. Clay content is 35 to 55 percent. Structure is moderate to strong prismatic to moderate subangular blocky. Carbonates are disseminated and segregated. Many pedons have common irregularly shaped fine threads, seams or soft masses. Some pedons lack gypsum crystals in the Bt horizon. Electrical conductivity is 0.5 to 4.0 decisiemens per meter. Sodium adsorption ratio is less than 13. The increase in clay from the A to the Bt horizon is 5 to 15 percent within a vertical distance of 1 inch. In some pedons a BA horizon occurs.
The C horizon has color of 10YR 6/3, 6/4, 7/3 or 8/2. Moist color is 10YR 4/3, 5/3, 5/4, 6/3 or 7/3. Texture is loam, clay loam, silty clay, silty clay loam or clay. The lower part of the C horizon is stratified with thick layers of fine sandy loam, loam, silty clay or clay loam. Clay content is 12 to 50 percent. It has platy and subangular blocky structure or is massive. Electrical conductivity is 0.8 to 8.0 decisiemens per meter. Sodium adsorption ratio is 9 to 18.
COMPETING SERIES: These are the Armendaris, Continental, and Vekol series. Armendaris soils, in circular depressions associated with lava flows, formed in alluvium derived from loess, have color hues of 7.5YR below the A horizon. Continental soils (MLRA 40, 41, 42), on fan terraces, have color hues of 2.5YR, 5YR or 7.5YR, have a calcic horizon and are moist in the control section during summer rains in July, August or September. Vekol soils, on basin floors, have color hues of 7.5YR and 5YR in the B horizon and are moist in the control section during July, August or September.
GEOGRAPHIC SETTING: Yribarren soils are on alluvial fans and plains. Slope is 0 to 5 percent. These soils formed in alluvial deposits weathered mostly from sedimentary rocks. Elevation is 300 to 1,200 feet. The climate is arid with hot, dry summers and cool, moist winters. The mean annual precipitation is 5 to 8 inches. The mean January temperature is about 48 degrees F; the mean July temperature is about 85 degrees F; the mean annual temperature is 64 to 67 degrees F. Frost-free season is 250 to 300 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Garces,
Kimberlina,
Milham,
Panoche and
Twisselman soils. Garces soils, on alluvial fans, terraces and basin rims, have a natric horizon and a fine-loamy particle-size control section. Kimberlina soils, on flood plains and recent alluvial fans, have a coarse-loamy particle-size control section, and do not have an argillic horizon. Milham soils, on alluvial fans, plains, low terraces and fan remnants, have a fine-loamy particle-size control section. Panoche soils, on alluvial fans and flood plains, have a fine-loamy particle-size control section and do not have an argillic horizon. Twisselman soils, on alluvial fans and basin rims, do not have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well-drained; low to medium runoff; permeability is very slow.
USE AND VEGETATION: This soil is used for irrigated cropland to produce almonds, barley, wheat, cotton, onions, sugar beets, watermelons, pistachios, and wine grapes. In uncultivated areas, this soil is used for livestock grazing to provide spring grazing for sheep and cattle. Native vegetation consists of annual grasses, forbs and desert saltbush (Atriplex spp.).
DISTRIBUTION AND EXTENT: Mainly in the southern part of the San Joaquin Valley of California. The soils are not extensive. MLRA 17.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Kern County, Northwestern Part, California, 1982.
REMARKS: The soil does not have a natric horizon because the sodium adsorption ratio in the Bt horizon or C horizon is less than 13.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 7 inches (A horizon).
Argillic horizon - 7 to 19 inches (Bt, Btk horizons).Particle-size control section - entire argillic horizon (7 to 19 inches)