LOCATION LITRO LAEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, thermic Chromic Dystraquerts
TYPICAL PEDON: Litro clay on a 0 percent slope in a wooded area.
(Colors are for moist soil.)
A--0 to 4 inches; dark gray (10YR 4/1) clay; moderate medium subangular blocky structure; firm; common fine and medium roots; very strongly acid; clear smooth boundary. (3 to 8 inches thick)
Bg--4 to 14 inches; light gray (10YR 6/1) clay; moderate fine and medium subangular blocky structure; firm; few fine and medium roots; few fine pores and root channels; shiny pressure faces on surfaces of peds; common medium prominent strong brown (7.5YR 5/6) masses of iron accumulation; very strongly acid; clear smooth boundary. (8 to 14 inches thick)
Bssg--14 to 40 inches; gray (10YR 5/1) clay; moderate medium subangular blocky structure; firm; few fine and medium roots; few very fine pores; few slickensides; shiny pressure faces on surfaces of peds; common medium prominent yellowish brown (10YR 5/6) masses of iron accumulation; very strongly acid; gradual wavy boundary. (10 to 30 inches thick)
B'g--40 to 70 inches; light brownish gray (10YR 6/2) clay; moderate medium subangular blocky structure; firm; few fine roots; shiny pressure faces on surfaces of peds; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; extremely acid.
TYPE LOCATION: Morehouse Parish, Louisiana; 14 miles northwest of Bastrop, 0.2 miles north of drainage ditch, 500 feet northeast of Ouachita River, 24 feet east of woods road, SW1/4SW1/4, sec. 20, T. 23 N., R. 4 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to 100 inches. Reaction ranges from extremely acid to strongly acid except where the surface layer has been limed. Reaction is extremely acid or very strongly acid in more than half the thickness of the upper 20 inches. The effective cation exchange capacity is 50 percent or more saturated with exchangeable aluminum in the control section to a depth of 30 inches or more. COLE values of the control section range from 0.09 to 0.13.
The A horizon has hue of 10YR to 5Y; value of 3 or 4, and chroma of 1 or 2. Texture is typically clay, silty clay, or silty clay loam but some pedons have silt loam or coarser textured recent overwash.
The Bg horizon has hue of 10YR to 5Y, value of 4 to 6, and chroma of 1. Iron accumulations in shades of brown or yellow range from few to many. Texture is clay or silty clay.
The Bssg horizon has hue of 10YR to 5Y, value of 4 to 6, and chroma of 1 within a depth of 30 inches, and hue of 10YR to 5Y, value of 4 to 6, and chroma of 1 or 2 below a depth of 30 inches. Iron accumulations in shades of brown or yellow range from few to many. Texture is clay or silty clay.
The B'g horizon has hue of 10YR to 5Y, value of 4 to 6, and chroma of 1 or 2. Iron accumulations in shades of brown or yellow range from few to many. Texture is clay or silty clay.
COMPETING SERIES: There are no other series in the same family. Series in similar families are the Alligator, Gladewater, Kobel, Leeper, Perry, Portland, Sharkey, Tamba, Tuscumbia, and Una series. Alligator, Gladewater, Kobel, Leeper, Perry, Portland, and Sharkey soils have smectitic mineralogy. In addition, Gladewater, Perry, Portland, and Sharkey soils have a very-fine, nonacid control section. Tamba and Una soils do not form cracks or slickensides. Kobel, Leeper, and Tuscumbia soils have a nonacid control section and do not form cracks or slickensides.
GEOGRAPHIC SETTING: Litro soils are on low, level to nearly level flood plains of the Ouachita River and its tributaries. Slopes range from 0 to 2 percent. These soils formed in clayey alluvial sediments. Mean annual precipitation is 51 inches. Average annual temperature is 65 degrees F. near the type location.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Perry soils, and Groom, Guyton, Haggerty, and Mollicy soils. Groom and Mollicy soils are on ridges at higher elevations and have a fine-silty control section. Guyton soils are at slightly higher elevations and have a fine-silty control section. Haggerty soils are on low terrace ridges, have a coarse-loamy control section, and are better drained.
DRAINAGE AND PERMEABILITY: Poorly drained; high runoff; very slowly permeable. These soils are flooded for long periods during winter and early spring unless protected. A water table is at depths of 0 to 2 feet below the surface from December through June.
USE AND VEGETATION: Most of this soil is in woodland. Common trees include willow oak, water oak, overcup oak, baldcypress, water tupelo and persimmon. Areas that are protected from flooding are used for growing rice and soybeans.
DISTRIBUTION AND EXTENT: Western Coastal Plain of North Central Louisiana and possibly Arkansas. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Morehouse Parish, Louisiana, 1981.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Ochric epipedon .........0 to 4 inches (A)
Cambic horizon .. ..4 to 70 inches (Bg, Bssg, B'g)
Slickensides............14 to 40 inches (Bssg)
Aquic conditions.........4 to 14 inches (Bg horizon)