LOCATION ARLINGTON CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, active, thermic Haplic Durixeralfs
TYPICAL PEDON: Arlington very fine sandy loam - non-tilled citrus orchard (Colors are for dry soil unless otherwise stated.)
Ap--0 to 7 inches; brown (10YR 5/3) very fine sandy loam, dark brown (10YR 3/3) moist; weak fine granular structure; hard, friable, slightly sticky, nonplastic; many very fine roots; many fine and very fine tubular pores; neutral (pH 7.3); clear wavy boundary. (4 to 9 inches thick)
B1t--7 to 11 inches; brown (7.5YR 5/4) very fine sandy loam, reddish brown (5YR 4/3) moist; massive; hard, friable, slightly sticky, nonplastic; many very fine roots; many fine and very fine tubular pores; slightly alkaline (pH 7.5); gradual smooth boundary. (4 to 8 inches thick)
B21t--11 to 17 inches; reddish brown (5YR 5/4) loam, dark reddish brown (5YR 3/4) moist; moderate fine subangular blocky structure; hard, friable, slightly sticky, plastic; many fine and coarse roots; common fine and medium tubular pores; few thin clay films on faces of peds and lining pores; slightly alkaline (pH 7.8); gradual smooth boundary. (6 to 13 inches thick)
B22t--17 to 21 inches; reddish brown (5YR 5/3) loam, reddish brown (5YR 4/3) moist; strong fine subangular blocky structure; hard, friable, slightly sticky, slightly plastic; common very fine and coarse roots; common fine and very fine tubular pores; few thin clay films on faces of peds and lining pores; slightly effervescent, lime segregated in fine soft masses; slightly alkaline (pH 7.8); gradual wavy boundary. (4 to 10 inches thick)
B3t--21 to 24 inches; reddish brown (5YR 5/4) loam, dark reddish brown (5YR 3/4) moist; massive; hard, friable, slightly sticky, slightly plastic; few fine and coarse roots; common very fine tubular pores; few thin clay films in bridges and lining pores; slightly effervescent, lime segregated in fine soft masses; slightly alkaline (pH 7.5); abrupt wavy boundary. (0 to 14 inches thick)
C1si--24 to 36 inches; brown (10YR 5/3) weakly cemented horizon, brown (10YR 4/3) moist; crushes to sandy loam; very coarse prismatic structure; very hard, very firm, nonsticky, nonplastic; common very fine tubular pores; strongly effervescent in fine seams between structural units; light gray (10YR 7/2) siliceous coatings on the surface of the prisms which do not slake in water or acid; slightly alkaline (pH 7.5); clear wavy to irregular boundary. (4 to 12 inches thick)
C2--36 to 47 inches; brown (10YR 5/3) coarse loamy sand, brown (10YR 4/3) moist; massive; neutral (pH 7.0). (Many feet thick)
TYPE LOCATION: Riverside County, California; on north side of Victoria Avenue between Maude and Jane Streets, about 2 miles east of Arlington, California; approximately 1,050 feet south, 1,100 feet east of W1/4 corner sec. 2, T.3S., R.5W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at a depth of 20 inches is about 65 degrees F. The soil between depths of 8 and 24 inches usually is moist in some part from about December 1 until late May and is continuously dry the rest of the time. Depth to the cemented horizon is 24 to 40 inches.
The A horizon is brown to pale brown (10YR 6/3, 6/4, 5/3, 5/4) coarse sandy loam, sandy loam, fine sandy loam or loam. It is slightly acid to mildly alkaline. Organic matter averages less than 1 percent in the A horizon. The B2t horizon is yellowish brown in 10YR hue, brown or strong brown in 7.5YR hue or reddish brown in 5YR hue. It is heavy sandy loam, fine sandy loam or loam and has less than 18 percent clay. This horizon has weak to strong angular blocky structure in some or all parts. Except for some pedons with an Ap horizon the upper boundary of the B2t horizon is clear or gradual or there is an A3 or Bl horizon and the absolute clay increase from A horizon to B2t horizon is about 4 to 8 percent.
The B2t horizon is slightly acid to mildly alkaline. Some pedons lack a B3t horizon. The B3t horizon is similar to or less red than the B2t horizon. It is slightly acid to moderately alkaline and is calcareous with segregated lime in most pedons.
The Csi horizon is brown, pale brown, yellowish brown or light yellowish brown, dominantly in 10YR hue. In most pedons color is not uniform and there are streaks, seams and blotches of the colors listed. The structural units are prisms or are prism-like and usually are about 6 to 24 inches in diameter. They are coated with light gray or white (10YR 7/2D8/1) amorphous siliceous material about 0.1 to 0.3mm in thickness. Coatings are dominantly on the sides of peds, some as bridges, but are incomplete or mostly lacking on the top of the prisms. The prisms are slightly to moderately brittle when moist and are very firm or extremely firm. Thin seams of calcium carbonate and a few flattened exped roots occur between the siliceous coatings of the prisms in some pedons.
COMPETING SERIES: These are the Buchenau, Buren, Exeter, Monserate, Ramona, Rocklin, and Ysidora series. All of these soils have more than 18 percent clay in the argillic horizon. Also, Buchenau, Exeter, Monserate and Rocklin soils have strongly cemented duripans and Ramona soils lack a duripan.
GEOGRAPHIC SETTING: The Arlington soils are nearly level to strongly sloping and are on alluvial fans and terraces at elevations of about 400 to 2,000 feet. The climate is one of long dry summers and short mild winters with an average annual precipitation of 10 to 15 inches. The average January temperature is 51 degrees F., average July temperature is 76 degrees F., and average annual temperature is 63 degrees F. The freeze-free season is 240 to 320 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Ramona soils and the Fallbrook, Greenfield, Hanford, and Vista soils. All of these soils lack cemented horizons within a depth of 40 inches. Also, Fallbrook soils have a paralithic contact and Vista soils lack argillic horizons.
DRAINAGE AND PERMEABILITY: Well-drained; slow to medium runoff; slow permeability.
USE AND VEGETATION: Used mostly for growing grain, citrus, and truck crops. Naturalized vegetation is mainly annual grasses and forbs.
DISTRIBUTION AND EXTENT: Coastal and intermediate valleys of southern California. The soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Riverside County, California, 1973.
REMARKS: The Arlington soils were formerly classified as Noncalcic Brown soils. In earlier mapping most of the Arlington soils were included in the Ramona and Placentia series.
The activity class was added to the classification in January of 2003. Competing series were not checked at that time. - ET
OSED scanned by SSQA. Last revised by state on 8/73.