LOCATION LATANIER LA+AR OKEstablished Series
TAXONOMIC CLASS: Clayey over loamy, smectitic over mixed, superactive, thermic Oxyaquic Hapluderts
TYPICAL PEDON: Latanier clay--pasture. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; dark reddish brown (5YR 3/3) clay; strong coarse subangular blocky structure; very firm; neutral; gradual wavy boundary. (4 to 8 inches thick)
Bwss1--6 to 25 inches; dark reddish brown (5YR 3/3) clay; moderate coarse prismatic structure parting to moderate medium and fine angular blocky; firm; slightly effervescent; slightly alkaline; abrupt wavy boundary. (8 to 28 inches thick)
Bwss2--25 to 30 inches; dark reddish brown (5YR 3/4) silty clay; weak coarse subangular blocky structure; firm; strongly effervescent; moderately alkaline; clear wavy boundary. (0 to 10 inches thick)
2C1--30 to 41 inches; light reddish brown (5YR 6/4) silt loam; massive; friable; strongly effervescent; moderately alkaline; abrupt wavy boundary. (8 to 20 inches thick)
2C2--41 to 45 inches; light reddish brown (5YR 5/4) silty clay loam; massive; plastic; strongly effervescent; moderately alkaline; abrupt wavy boundary.
2C3--45 to 60 inches; reddish brown (5YR 4/4) silt loam; massive; very friable; strongly effervescent; moderately alkaline.
TYPE LOCATION: Rapides Parish, Louisiana; 1.4 mile southeast of Chambers; 100 feet east of drainage ditch; 400 feet north of the southeast corner of Spanish Land Grant, sec. 54, T. 2 N., R. 1 E.
RANGE IN CHARACTERISTICS: Solum thickness and depth to contrasting texture range from 20 to 40 inches. Latanier soils are calcareous in some horizons between a depth of 8 and 36 inches. Cracks 1 cm or more in width are throughout the upper clayey part of the soil during extended dry periods.
The A horizon has hue of 7.5YR or 5YR, value of 3, and chroma of 2 or 3. Texture is clay, silty clay, or silty clay loam. Reaction is neutral, mildly alkaline, or moderately alkaline.
The Bwss horizon has hue of 2.5YR or 5YR, value of 3 to 5, and chroma of 2 to 4. Value 3 and chroma 3 colors extend into the upper part of the Bwss horizon. Texture is clay or silty clay. Reaction is neutral, mildly alkaline, or moderately alkaline. Typically, some part or all of the Bwss horizon is calcareous. Slickensides are few to common.
A 2B horizon is in some pedons. Where present, it has the same color as the B horizon and the same texture and reaction as the 2C horizon.
The 2C horizon has hue of 5YR, value of 4 to 6, and chroma of 3 to 6. Texture is monotextured or stratified very fine sandy loam, silt loam, or silty clay loam. Thin strata of clay or silty clay are between depths of 50 and 60 inches in some pedons. It is neutral, mildly alkaline, or moderately alkaline, and is calcareous.
COMPETING SERIES: There are no other series in the same family. Similar soils are the Bowdre, Moreland, Newellton, and Tunica series. Bowdre soils are grayer and have a loamy discontinuity within a depth of 20 inches. Moreland soils are very-fine textured throughout. Newellton and Tunica soils have a lighter colored epipedon and are not as red.
GEOGRAPHIC SETTING: Latanier soils are on level to very gently sloping alluvial plains of the Arkansas and Red Rivers. They formed in reddish clayey over loamy alluvium. The climate is warm and humid with the Thornthwaite P-E index greater than 64. Mean annual rainfall ranges from 38 to 60 inches and mean annual temperature ranges from 57 degrees to 70 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the competing Moreland series and the Coushatta, Lela, Oklared, and Redlake series. Lela soils do not have a discontinuity with an abrupt textural change. Coushatta soils are fine-silty throughout. Oklared soils are coarse-loamy throughout and Redlake soils do not have an abrupt textural change within the control section.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; very slow permeability. An apparent seasonal high water table is 1 to 3 feet below the surface December through April.
USE AND VEGETATION: Areas protected by levees have been cleared and are used for cotton, soybeans, rice, small grain, hay, and pasture. Native vegetation is mixed hardwoods such as cherrybark oak, water oak, sweetgum, pecan, sycamore, green ash, and hackberry.
DISTRIBUTION AND EXTENT: Alluvial plains of the Arkansas and Red Rivers in Louisiana, Arkansas, Oklahoma, and Texas. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Little Rock, Arkansas
SERIES ESTABLISHED: Rapides Parish, Louisiana; 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Vertic properties . . . . .0 to 30 inches (Ap, Bwss1, Bwss2).
Lithologic Discontinuity . . . . . .30 inches (top of the 2C horizon)