LOCATION DILL OK+TXEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, active, thermic Typic Haplustepts
TYPICAL PEDON: Dill fine sandy loam, in pasture.
(Colors are for dry soil unless otherwise stated.)
A--0 to 12 inches; reddish brown (2.5YR 4/4) fine sandy loam, dark reddish brown (2.5YR 3/4) moist; very weak fine granular structure; slightly hard, very friable; neutral; gradual smooth boundary. (6 to 16 inches thick)
Bw--12 to 32 inches; red (2.5YR 4/6) fine sandy loam, dark red (2.5YR 3/6) moist; weak medium subangular blocky structure; slightly hard, very friable; few fragments of soft sandstone in lower 6 inches; neutral; abrupt irregular boundary. (8 to 38
inches thick)
Cr--32 to 40 inches; weakly cemented noncalcareous red (10R 4/6) sandstone.
TYPE LOCATION: Washita County, Oklahoma; about 1 mile south and1/2 mile east of Canute; 1,930 feet east and 45 feet north of the southwest corner of sec. 24, T. 11 N., R. 20 W.
RANGE IN CHARACTERISTICS: Solum thickness is 20 to 40 inches. Reaction of the A and Bw horizon is slightly acid through slightly alkaline. Clay content is 8 to 18 percent.
The A horizon is reddish brown (2.5YR 4/4, 5/4; 5YR 4/3, 4/4, 5/3, 5/4). Texture of the A horizon is loam, fine sandy loam, very fine sandy loam, or loamy fine sand. The organic-carbon content is less than 0.6 percent when reddish brown (5YR 4/3, 5/3) color is present.
The Bw horizon is reddish brown (2.5YR 4/4, 5/4; 5YR 4/4, 5/4), or red (10R 4/6; 2.5YR 4/6, 5/6). It is loam, fine sandy loam, or very fine sandy loam. Structure is very weak through moderate and granular, subangular blocky, or prismatic.
The Cr horizon is reddish brown (2.5YR 4/4, 5/4; 5YR 4/4, 5/4) or red (10R 4/6, 5/6; 2.5YR 4/6, 5/6, 5/8). It is weakly cemented sandstone. Reaction is slightly acid through moderately alkaline (noncalcareous).
In some areas, crevices and partings in the bedrock are coated with calcium carbonate.
COMPETING SERIES: These are the Hardeman, Hext and Shrewder series in the samefamily. Hardeman and Shrewder soils lack sandstone within 40 inches. Hext soils have free carbonates through out the soil profile.
GEOGRAPHIC SETTING: Dill soils are on nearly level to strongly sloping upland ridgecrests and sideslopes of the Central Rolling Red Plains. Slopes range from 0 to 12 percent. The soil formed in material weathered from soft, noncalcareous sandstone of Permian age. Mean annual precipitation ranges from 22 to 28 inches. Mean annual temperature ranges from 57 degrees to 64 degrees F. Thornthwaite annual P-E indices range from 33 to 44.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cordell, Grandfield, Quinlan, and Woodward series. Cordell and Quinlan soils have sola less than 20 inches thick and they are mainly on ridgecests. Grandfield soils have an argillic horizon and are on adjacent slightly higher convex ridges. Woodward soils have a coarse-silty control section and are on adjacent slightly lower sideslopes.
DRAINAGE AND PERMEABILITY: Dill soils are well drained; permeability is moderately rapid. Runoff is negligible on slopes of 0 to 3 percent, very low on 3 to 5 percent slopes, low on 5 to 10 percent slopes and medium on 10 to 12 percent slopes.
USE AND VEGETATION: Mainly cultivated to cotton, grain sorghums, and small grains. Native vegetation is mid and tall grasses.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains (MLRA 78C) of Oklahoma and Texas. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Washita County, Oklahoma; 1935.
REMARKS: Dill soils were formerly classified in the Reddish Chestnut great soil group.
ADDITIONAL DATA: Sample No. 75-OK-75-4 by Oklahoma State University, Stillwater, Oklahoma.