LOCATION MYOMA CA
Established Series
Rev. LAB/AAK/GMK
12/2015
MYOMA SERIES
Typically, Myoma soils are light olive gray, moderately alkaline fine and very fine sands to a depth of about 31 inches. Below 31 inches they are strongly alkaline very fine sands.
TAXONOMIC CLASS: Mixed, hyperthermic Typic Torripsamments
TYPICAL PEDON: Myoma fine sand - uncultivated. (Colors are for try soil unless otherwise noted.)
C1--0 to 18 inches; light olive gray (5Y 6/2) fine sand, olive gray (5Y 5/2) moist; single grain; loose dry and moist; common very fine and few fine roots; some conch shells; slightly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (9 to 20 inches thick)
C2--18 to 24 inches; light olive gray (5Y 6/2) very fine sand, olive gray (5Y 5/2) moist; single grain, loose; few common very fine roots; highly micaceous; cross bedding; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (3 to 10 inches thick)
C3--24 to 31 inches; light olive gray (5Y 6/2) fine sand, olive gray (5Y 5/2) moist; single grain; loose; few very fine and fine roots; few conch and clam shells; moderately alkaline (pH 8.4); clear wavy boundary. (6 to 14 inches thick)
C4--31 to 60 inches; light olive gray (5Y 6/2) very fine sand, olive gray (5Y 4/2) moist; single grain; loose; few very fine roots; few conch and clam shell; strongly effervescent; strongly alkaline (pH 8.6)
TYPE LOCATION: Riverside County, California; 3 miles south of Indio; 440 feet east and 100 feet south of N1/4 corner section 11, T. 6 S., R. 7 E. SBBM.
RANGE IN CHARACTERISTICS: The texture of the C1 horizon is very fine sand to sand. Hue is 2.5Y and yellower, value is 5 through 7 dry and 3 through 6 moist with chroma of 1 through 3 moist and dry. The control section has less than 15 percent coarse fragments and less than 15 percent of coarse and very coarse sand. The profile throughout is moderately to strongly alkaline with slight to violent effervescence.
COMPETING SERIES: These are the
Carrizo,
Carsitas,
Coachella,
Delhi, and
Rositas series. Carrizo soils have more than 35 percent coarse fragments. Carsitas soils have 15 to 35 percent coarse fragments. Coachella soils have an irregular decrease in organic matter in the control section. Delhi soils have a thermic temperature regime. Rositas soils have hue of 10YR or redder throughout.
GEOGRAPHIC SETTING: Myoma soils are nearly level to rolling, have hummocky micro relief where unprotected and are at elevations of 200 feet below sea level to 1,800 feet above sea level. The soil formed in sand blown from recent alluvium. The climate is arid with an annual precipitation of 2 to 4 inches that occurs as gentle winter rain or erratic high intensity summer storms. The average January temperature is about 53 degrees F., average July temperature is 92 degrees F. and the average annual temperature is about 72 to 75 degrees F. The frost-free season (32 degrees F.+) is about 290 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Carsitas and
Coachella series and the
Gilman,
Niland, and
Salton soils. Gilman soils have a coarse-loamy control section. Niland soils have contrasting textures in the control section, sandy over clayey. Salton soils have a fine-silty control section.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; very slow runoff; rapid permeability.
USE AND VEGETATION: Myoma soils are used principally for growing citrus fruits, grapes, alfalfa, dates and truck crops under irrigation. Native vegetation is ephemeral grasses and forbs, and a sparse cover of creosotebush, bush sunflower and mesquite.
DISTRIBUTION AND EXTENT: Southern California. Myoma soils are extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA
SERIES ESTABLISHED: Riverside County (Coachella Valley Area), California, 1974.
OSED scanned by SSQA. Last revised by state on 5/74.
Responsibility for this series was transferred from Davis to Phoenix 12/2015. The last revision to the series was 5/1997. ET
National Cooperative Soil Survey
U.S.A.