LOCATION LARTON OK+TXEstablished Series
TAXONOMIC CLASS: Loamy, siliceous, active, thermic Arenic Paleudalfs
TYPICAL PEDON: Larton loamy fine sand - cultivated. (Colors are for moist soils unless otherwise stated.)
Ap--0 to 9 inches; brown (7.5YR 4/4) loamy fine sand, light brown (7.5YR 6/4) dry; single grained; loose dry or moist; slightly acid; abrupt smooth boundary. (0 to 9 inches thick)
E--9 to 25 inches; brown (7.5YR 5/4) loamy fine sand, light brown (7.5YR 6/4) dry; weak fine granular structure; slightly hard, friable; few organic stains; moderately acid; clear wavy boundary. (l0 to 31 inches thick)
Bt1--25 to 3l inches; red (2.5YR 5/6) fine sandy loam, light red (2.5YR 6/6) dry; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable; thin nearly continuous clay films on faces of peds and bridging sand grains; organic stains in few root channels; few streaks of material from above horizons; moderately acid; gradual smooth boundary. (6 to l4 inches thick)
Bt2--3l to 48 inches; yellowish red (5YR 5/6) fine sandy loam, reddish yellow (5YR 6/6) dry; moderate medium subangular blocky structure; hard, friable; thin nearly continuous clay films on faces of peds; moderately acid; gradual smooth boundary. (l0 to 24 inches thick)
Bt3--48 to 60 inches; yellowish red (5YR 5/6) fine sandy loam, reddish yellow (5YR 6/6) dry; weak medium subangular blocky structure; hard, friable; thin patchy clay films on faces of peds; few organic stains; few bodies of clean sand grains; moderately acid; gradual smooth boundary. (l0 to 20 inches thick)
Bt4--60 to 73 inches; mixed yellowish red (5YR 5/6), red (2.5YR 5/6), and pale brown (l0YR 6/3) relict redoximorphic concentrations; sandy clay loam; weak coarse subangular blocky structure; hard, firm; thin patchy clay films on faces of peds, few bodies of clean sand grains; organic stains in root channels; slightly acid.
TYPE LOCATION: Bryan County, Oklahoma; about l2 miles southwest of Durant; 2,2l0 feet east and 60 feet north of the southwest corner in sec. 2, T. 8 S., R. 7 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to 80 or more inches. The A or Ap horizon has hue of 7.5YR or 10YR, value of 3 to 6, and chroma of 2 to 4. The E horizon has hue of 7.5YR or 10YR, value of 4 to 7, and chroma of 2 to 4. The A horizon or E horizon is slightly acid to strongly acid.
The Bt horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8 or hue of 7.5YR, value of 5, and chroma of 6 to 8. It is fine sandy loam, loam, or sandy clay loam (l5 to 25 percent clay) and is moderately acid to very strongly acid. Some pedons lack pockets of clean sand grains in the lower part. The Bt4 horizon is similar to the upper Bt horizon in color but ranges from slightly acid to strongly acid and contains pockets of clean sand grains comprising 2 to l0 percent by volume.
Some pedons have BC horizons with colors and textures similar to the Bt horizon.
COMPETING SERIES: These are the Larue and Wolfpen soils. Larue soils have an average clay content between 20 and 30 percent in the control section. Wolfpen soils have a Bt horizon with l0YR or 7.5YR hues.
GEOGRAPHIC SETTING: Larton soils occur on nearly level to strongly sloping terraces; slopes range from 0 to 20 percent. They formed in sandy and loamy sediments. The Thornthwaite P-E index ranges from 64 to 80. Average annual precipitation ranges from 38 to 45 inches. The mean annual temperature ranges from 57 to 67 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Boxville, Karma, Muskogee, and Okay soils. The Boxville soils are on terraces of similar elevation and they have a clayey particle size control section. Muskogee soils are on higher terraces and are fine-silty. Karma soils are on lower terraces and have an argillic horizon that decreases by more than 20 percent clay from the maximum within a depth of 60 inches. Okay soils are on terraces of similar elevations and have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained; surface runoff is neglible to high; moderate permeability.
USE AND VEGETATION: Used mainly for bermudagrass. Some areas are cultivated to peanuts, grain sorghum, small grains, and soybeans. Native vegetation is mostly oak with an understory of tall and midgrasses.
DISTRIBUTION AND EXTENT: Mainly on high terraces along the Red River and other major rivers. The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Bryan County, Oklahoma; l974.
REMARKS: Soil Interpretation Record: Series OK0124
These soils were formerly included in the Dougherty series in earlier surveys.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon- The zone from the surface of the soil to a depth of 9 inches (Ap horizon).
Albic horizon- The zone from 9 inches to a depth of 25 inches (the E horizon).
Argillic horizon- The zone from 25 inches to a depth of 73 inches (the Bt horizons).
Arenic feature- has a sandy particle size throughout a layer extending from the mineral soil surface to the top of the argillic horizon at a depth of 50 to 100 cm.