LOCATION COOTER MO
Established Series
Rev. KDV-LJG
02/2013
COOTER SERIES
The Cooter series consists of deep, moderately well drained soils formed in alluvium on nearly level to depressional areas of flood plains. Permeability is slow in the upper part and rapid to very rapid in the underlying material. Slopes range from 0 to 4 percent. Mean annual temperature is 60 degrees F, and mean annual precipitation is 48 inches.
TAXONOMIC CLASS:
TYPICAL PEDON: Cooter silty clay loam - cultivated. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; very dark grayish brown (10YR 3/2) silty clay loam, grayish brown (10YR 5/2) dry; weak very fine granular structure; firm; many fine roots; neutral; abrupt smooth boundary. (4 to 10 inches thick)
A--6 to 14 inches; very dark gray (10YR 3/1) silty clay; gray (10YR 5/1) dry; common fine, distinct brown (10YR 4/3) mottles; moderate fine subangular blocky structure; firm; many fine roots; neutral; clear wavy boundary. (6 to 14 inches thick)
2C1--14 to 22 inches; dark grayish brown (10YR 4/2) loamy sand; single grain; very friable; neutral; gradual wavy boundary.
2C2--22 to 60 inches; brown (10YR 5/3) sand with few pockets and thin lenses of grayish brown (10YR 5/2) fine sandy loam; single grain; loose; neutral.
TYPE LOCATION: Pemiscot County, Missouri, about 1/2 mile north of Arkansas state line and 1 mile west of St. Francois (Mississippi River) Levee; 1420 feet south and 50 feet west of the northeast corner, sec. 21, T. 16 N., R. 12 E. Latitude 36 degrees, 5 minutes, 36.8 seconds N., longitude 89 degrees, 49 minutes, 53.2 seconds W., NAD83.
RANGE IN CHARACTERISTICS: Depth to the contrasting sandy 2C horizons ranges from 12 to 24 inches. Reactions commonly range from slightly acid to mildly alkaline throughout the soil, but medium acid is not excluded.
The Ap and A horizons have hue of 10YR or 2.5Y, value of 2 or 3, and chroma of 1 to 3. They are silty clay, clay, or silty clay loam averaging between 35 to 48 percent clay.
The 2C1 horizon has hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 1 to 4. The 2C1 horizons with a base chroma of 3 or more have distinct mottles with chroma of 2 or less. The 2C2 horizon has hue of 10YR or 2.5Y, value of 4 to 6, and chroma of 2 to 6. The 2C horizons are loamy fine sand, loamy sand, fine sand, and sand, but have thin lenses of silt loam, very fine sandy loam, or fine sandy loam. The 2C horizons below 40 inches commonly have strata of finer textures.
COMPETING SERIES: There are no other members of this family. Competing soils in other families are the
Bowdre,
Riley, and
Tunica series. Bowdre soils are clayey over loamy. Riley soils are fine loamy over sandy or sandy-skeletal and they are mesic. Tunica soils do not have mollic epipedons and are clayey over loamy.
GEOGRAPHIC SETTING: Cooter soils are formed in alluvium on nearly level to depressional areas of flood plains. The general area of their occurrence is old lakes, channels, and bayous. Surface topography is commonly undulating with Cooter soils occupying both low ridges and depressions on slopes ranging from 0 to 4 percent. Mean annual temperature ranges from 59 to 65 degrees F, and mean annual precipitation ranges from 45 to 55 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: In addition to the competing
Bowdre and
Tunica soils, these are the
Bruno,
Caruthersville,
Commerce,
Crevasse,
Hayti,
Portageville, and
Sharkey soils. Bowdre and Tunica soils are on similar positions. Bruno and Crevasse soils are sandy throughout the 10- to 40-inch control section occur higher in the landscape. Caruthersville soils have finer textures in the lower part of their 10- to 40-inch control section and occur higher in the landscape. Commerce, Hayti, Portageville, and Sharkey soils have finer textures in the lower part of their 10- to 40-inch control section and occur on similar landscapes.
DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is slow to medium. Permeability of the clayey upper part is slow and the sandy lower part is rapid to very rapid.
USE AND VEGETATION: Almost all areas are cropped for soybeans, cotton, small grains, and corn. Native vegetation is mixed hardwoods with few cypress.
DISTRIBUTION AND EXTENT: The lower Mississippi River Delta--Missouri. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: AUBURN, ALABAMA
SERIES ESTABLISHED: Pemiscot County, Missouri, 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface of the soil to 14 inches (Ap and A horizon); udic moisture regime.
National Cooperative Soil Survey
U.S.A.