LOCATION YETTEM CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Entic Haploxerolls
TYPICAL PEDON: Yettem sandy loam, annual pasture. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 14 inches; dark gray (10YR 4/1) sandy loam, very dark gray (10YR 3/1) moist; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and few fine tubular pores; slightly acid (pH 6.3); clear smooth boundary. (8 to 14 inches thick)
A--14 to 26 inches; gray (10YR 5/1) sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and few fine tubular pores; slightly acid (pH 6.5); clear smooth boundary. (0 to 16 inches thick)
C1--26 to 56 inches; grayish brown (10YR 5/2) sandy loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common very fine roots; common very fine tubular pores; neutral (pH 7.0); clear smooth boundary. (16 to 32 inches thick)
C2--56 to 70 inches; light brownish gray (10YR 6/2) sandy loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine tubular pores; slightly effervescent, with disseminated lime; slightly alkaline (pH 7.8).
TYPE LOCATION: Tulare County, California; about 6 miles north of Orosi; 2,400 feet west and 200 feet south of the northeast corner of section 8, T. 15 S., R. 25 E., Orange Cove North Quadrangle.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 64 to 67 degrees F. and the soil temperature usually is not below 47 degrees F. at any time.
Organic matter: 1 to 2 percent in the surface 8 to 14 inches, and decreases regularly to a depth of 60 inches or more. It has less than 1 percent organic matter at a depth of 20 inches.
A Horizon--10YR 4/1, 4/2, 4/3, 5/1, 5/2 or 5/3; 10YR 3/1, 3/2, 3/3, 4/1, 4/2 or 4/3 moist.
Structure: Granular structure or it is massive
Reaction: Moderately acid to slightly alkaline.
C Horizon--10YR 4/2, 4/3, 5/2, 5/3, 5/4, 6/2, 6/3, 6/4, 7/2 or 7/3; 10YR 3/2, 3/3, 3/4, 4/2, 4/3, 4/4, 5/2, 5/3 or 5/4 moist.
Texture: Sandy loam, coarse sandy loam or fine sandy loam.
Clay content: 5 to 18 percent.
Carbonates: Effervescence ranges from none to strong.
Reaction: Neutral to moderately alkaline.
COMPETING SERIES: These are the Capistrano series. Capistrano soils have a mean annual soil temperature that ranges from 60 to 65 degrees F. and have less than 20 degrees difference between winter and summer soil temperatures.
GEOGRAPHIC SETTING: Yettem soils are on alluvial fans and flood plains. Elevations range from 225 to 1,500 feet. Slopes range from 0 to 5 percent. They formed in alluvium predominantly from granitic sources. The climate is subhumid mesothermal with hot, dry summers and cool, moist winters. The mean annual precipitation is 9 to 15 inches. The average January temperature is 46 degrees F.; the average July temperature is 78 degrees F.; and the mean annual temperature is about 62 to 65 degrees F. The frost free season is about 250 to 300 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Exeter and San Joaquin soils. Exeter and San Joaquin soils have a duripan at a depth of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; negligible or very low runoff; moderately rapid permeability.
USE AND VEGETATION: Cropland and annual pasture. Crops are oranges, plums, olives, walnuts and grapes. The native vegetation is annual grasses and forbs.
DISTRIBUTION AND EXTENT: Eastside of California's Central Valley and intermountain valleys of southern California. The soils are of moderate extent.
MLRA OFFICE RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Tulare County, California, Central Part, 1977.
REMARKS: Mollic epipedon - 0 to 14 inches (Ap horizon). Particle-size control section - 10 to 40 inch zone.
ADDITIONAL DATA: The Riverside Laboratory. 69-CALIF-54-1, Organic Carbon tests.