LOCATION TIMOR CAEstablished Series
TAXONOMIC CLASS: Sandy, mixed, thermic Entic Haploxerolls
TYPICAL PEDON: Timor loamy sand - on a nearly level slope of less than 1 percent in alfalfa at an elevation of 20 feet. (Colors are for dry soil unless otherwise stated. When described on June 20, 1977, the soil was moist throughout).
Ap--0 to 14 inches; grayish brown (10YR 5/2) loamy sand, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and common very fine roots; many very fine interstitial pores; neutral (pH 6.6); clear smooth boundary. (6 to 14 inches thick)
A--14 to 31 inches; grayish brown (10YR 5/2) loamy sand, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and common very fine roots; many very fine interstitial pores; neutral (pH 7.0) clear wavy boundary. (4 to 19 inches thick)
Bk--31 to 56 inches; brown (10YR 5/3) loamy sand, dark brown (10YR 4/3) moist; common medium distinct light brown (7.5YR 6/4) mottles, dark brown (7.5YR 4/4) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine interstitial pores; strongly effervescent; with common fine soft masses of lime; moderately alkaline (pH 7.9); abrupt wavy boundary. (21 to 27 inches thick)
2Bqkm--56 to 60 inches; light gray (10YR 7/2) strongly cemented duripan, grayish brown (2.5Y 5/2) moist; common medium distinct reddish yellow (7.5YR 6/6) mottles, dark brown (7.5YR 4/4) moist; massive; brittle; continuous indurated laminar capping 1 to 2 mm thick; strongly cemented in 75 percent of the matrix; strongly effervescent with common fine soft masses of lime; moderately alkaline (ph 8.0).
TYPE LOCATION: San Joaquin County, California; about 2 miles south of Lathrop, 1200 feet south of Yosemite Avenue and 500 feet west of McKinley Road in the SE1/4, NE1/4, NE1/4 of Section 2, T.2S., R.6E., MDBM, Lathrop quadrangle.
RANGE IN CHARACTERISTICS: Depth to Bk horizon is 10 to 30 inches. Depth to duripan is 40 to 60 inches. The mean annual soil temperature is 61 to 63 degrees F. The soil between the depths of about 12 and 45 inches is usually dry in all parts from June to October unless irrigated, and moist in all parts from December to April. Distinct and prominent mottles in hues of 5YR or 7.5YR are usually present at depths of 30 to 48 inches. Clay content is 2 to 10 percent throughout.
The A horizon is 10YR 5/2, 5/3, 4/2, or 4/3 and moist color is 10YR 2/2, 3/2 or 3/3. It is neutral to mildly alkaline. This horizon has 1 to 2 percent organic matter.
The Bk horizon is 10YR 4/4, 5/3, 5/4, 6/2, 6/3, or 6/4 and moist color is 10YR 5/4, 5/3, 4/4, 4/3, 4/2, or 3/3. It commonly is loamy sand, but includes loamy coarse sand or sand in the lower part of some pedons. It is mildly alkaline or moderately alkaline.
The 2Bqkm horizon is 10YR 7/3, 7/2, 7/1, 6/2 or 6/1 and moist color is 10YR 5/2 or 2.5Y 5/2.
COMPETING SERIES: This is the Baywood and Tinnin (T) series. Baywood soils lack mottles. Tinnin soils do not have Bk or Bqkm horizons.
GEOGRAPHIC SETTING: Timor soils are on low fan terraces or alluvial fans. Slopes are 0 to 2 percent. The soils formed in alluvium from granitic rock sources. Elevations are 20 to 40 feet. The climate is subhumid with hot dry summers and cool moist winters. Dense ground fog often occurs in winter months. Mean annual precipitation is 10 to 16 inches. Mean January temperature is 45 degrees F; mean July temperature is 77 degrees F; mean annual temperature is 60 to 61 degrees F. Frost-free period is about 260 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Tinnin soils and the Delhi, Honcut, Manteca and Veritas soils. Honcut and Veritas soils are coarse-loamy. Manteca soils have a duripan at depths of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; rapid permeability. Extensive pumping of water for irrigation and for domestic use has lowered the water table in most areas to a depth of 5 feet or more.
USE AND VEGETATION: Used for irrigated cropland growing primarily almonds, alfalfa, onions, tomatoes, small grains, grapes and pasture. Vegetation consists of red brome, filaree, soft chess, wildoats, ripgut brome and scattered California White Oaks.
DISTRIBUTION AND EXTENT: Northeastern San Joaquin Valley. The soil is of small extent in MLRA-17.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: San Joaquin County, California, 1990.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to a depth of 14 inches (Ap horizon). Organic matter decreases to less than 1 percent below 14 inches.
Entic subgroup - lacks a cambic horizon.
Duripan - The zone from 56 to 60 inches (2Bqkm horizon)