LOCATION VINA CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Pachic Haploxerolls
TYPICAL PEDON: Vina loam - open idle land with a slope of 1 percent under a cover of annual grasses and forbs at 200 feet elevation. (Colors are for dry soil unless otherwise stated).
A1--0 to 11 inches; dark grayish brown (10YR 4/2) loam; very dark grayish brown (10YR 3/2) moist; moderate medium and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; common very fine and fine tubular pores; neutral (pH 7.0); clear smooth boundary. (10 to 18 inches thick)
A2--11 to 36 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots, common very fine and fine tubular pores; neutral (pH 7.0); clear smooth boundary. (20 to 30 inches thick)
C--36 to 66 inches; grayish brown (10YR 5/2) fine sandy loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine tubular pores; neutral (pH 7.0).
TYPE LOCATION: Tehama County, California; about five tenths of a mile south of the town of Vina between the railroad and county road. It is 400 feet west and 2,000 feet south of the NE corner of sec. 23, T. 24 N., R. 2 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature varies from 62 to 67 degrees F. The soil moisture control section between depths of 8 to 25 inches is dry in all parts from June 1 to November 1 (120 days). The particle-size control section (10 to 40 inches) averages 12 to 18 percent clay and 15 to 25 percent fine sand or coarser material. Reaction is slightly acid or slightly alkaline. Organic carbon decreases regularly to 50 inches or more and remains higher than .3 percent. The mollic epipedon ranges from 30 to 48 inches in thickness.
The A horizon is 10YR 5/2, 4/3, 5/3 and 4/2. Moist color is 10YR 3/2 or 3/3. Surface textural phases mapped are fine sandy loam, sandy loam, silt loam, loam, clay loam and silty clay loam and may be gravelly.
The C horizon is 10YR 4/3, 5/2, 5/3 or 6/3. Moist colors are 10YR 3/3, 4/3 and 4/2. It is stratified loam, silt loam, sandy loam, fine sandy loam, clay loam or silty clay loam and may be gravelly (15 to 25 percent pebbles). Some pedons are very gravelly (35 to 60 percent pebbles) below 30 inches.
COMPETING SERIES: These are the Ignord and Sheridan soils. Ignord soils have carbonates throughout. Sheridan soils are moderately deep over weathered granite.
GEOGRAPHIC SETTING: Vina soils are on alluvial fans and flood plains. Slopes are 0 to 9 percent and elevations range from 30 to 1,000 feet. The soils developed in recent alluvium derived from mixed sources. The climate is Mediterranean with hot dry summers and cool moist winters. Mean annual precipitation is 14 to 40 inches. Mean January temperature is 45 degrees F, mean July temperature is 82 degrees F and the mean annual temperature is 60 to 64 degrees F. The frost-free period is 225 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Capay, Keefers, Los Robles, Toomes and Tuscan soils. Capay soils are clayey throughout. Keefer soils have a clayey subsoil. Los Robles soils are on alluvial plains and have a clay loam subsoil. Toomes soils are underlain at shallow depths by volcanic breccia. Tuscan soils have an indurated hardpan.
DRAINAGE AND PERMEABILITY: Well drained; negligible to medium runoff; moderate permeability. Some phases are rarely, frequently or occasionally flooded.
USE AND VEGETATION: Used for irrigated row crops, orchards, hay and pasture. Vegetation is valley oaks, cottonwoods, annual and perennial grasses.
DISTRIBUTION AND EXTENT: Inland valleys of northern and southern California. The series is moderately extensive in MLRA-17.
MLRA OFFICE RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Red Bluff Area, California, 1909.
REMARKS:
10/2006 changed runoff terminology- DWB
5/25/2005 Competing section updated as part of Butte County Soil Survey (CA612) final correlation conference. Use of Vina in Butte County is limited only to alluvial fans, not alluvial fans and floodplains that the series concept presently allows. -SS
Undated remarks: Laboratory data by University of California, Davis. (Change in classification is coarse-loamy family instead of fine-loamy). Soils previously mapped as fine-loamy would now be a different series. The concept of this soil is limited to the fine end of the coarse-loamy family. The Molinos series if mapped will be the coarser counterpart containing more than 25 percent fine sand or coarser. The Molinos series is presently inactivated. The Vina now borders the fine-loamy and coarse-silty families.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to a depth of 36 inches (A1,A2).