LOCATION FORTYONE OKEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Typic Haplustalfs
TYPICAL PEDON: Fortyone fine sandy loam--rangeland (Colors are for dry soil unless otherwise stated.)
A--0 to 7 inches; reddish brown (5YR 4/3), interior, fine sandy loam, dark reddish brown (5YR 3/3), interior, moist; weak fine and medium granular structure; slightly hard, very friable; common very fine to medium roots throughout; many very fine and fine pores; noneffervescent; 3 percent rounded gravel; neutral; clear smooth boundary. (4 to 20 inches thick)
Bt--7 to 24 inches; yellowish red (5YR 5/6), interior, sandy loam, and yellowish red (5YR 4/6), interior, moist; moderate medium and coarse prismatic structure parting to moderate medium subangular blocky; hard, friable; common very fine and fine roots throughout; common very fine and fine pores; common distinct discontinuous clay bridging between sand grains; noneffervescent; 5 percent rounded gravel; neutral; gradual smooth boundary. (6 to 31 inches thick)
BC--24 to 40 inches; reddish yellow (5YR 6/6), interior, loamy sand, yellowish red (5YR 5/6), interior, moist; weak medium prismatic structure parting to weak medium subangular blocky; hard, friable; common very fine and fine roots throughout; common very fine and fine pores; noneffervescent; 5 percent rounded gravel; neutral; gradual smooth boundary. (6 to 16 inches thick)
C--40 to 70 inches; reddish yellow (7.5YR 6/8), interior, loamy sand, strong brown (7.5YR 5/8), interior, moist; massive; slightly hard, friable; noneffervescent; 5 percent rounded gravel; neutral.
TYPE LOCATION: Woods County, Oklahoma; about 8 miles north and 8 miles west of Freedom; 550 feet north and 950 feet west of the southeast corner of Sec. 20, T. 28 N., R. 19 W.
RANGE IN CHARACTERISTICS: Typically Fortyone soils do not have free carbonates within 30 inches of the soil surface. Rounded gravel less 3 inches in diameter ranges from 2 to 15 percent by volume throughout the solum. Although the colors in the surface may meet the requirements of a mollic epipedon either the thickness or the organic matter content does not meet the requirements of a mollic epipedon.
The A horizon has hue of 5YR, 7.5YR or 10YR, value of 4 or 5, and chroma of 2 to 4. Texture is sandy loam, fine sandy loam, loam, or loamy fine sand. Reaction is slightly acid to slightly alkaline.
The Bt horizon has hue of 5YR, 7.5YR, or 10YR, value of 4 to 6, and chroma of 3 to 6. Texture is sandy loam, fine sandy loam, or loam with 10 to 18 percent clay. Reaction ranges from slightly acid to moderately alkaline.
The BC horizon has hue of 5YR, 7.5YR, or 10YR, value of 5 to 7, and chroma of 4 or 6. Texture is coarse sandy loam, sandy loam, or loamy sand. Reaction is slightly acid to moderately alkaline.
The C horizon has hue of 5YR, 7.5YR, or 10YR, value of 5 to 8, and chroma of 4 to 8. Texture ranges from fine sandy loam to gravelly sand and gravel content ranges from 0 to 40 percent by volume. Some pedons are stratified in this horizon. Reaction ranges from neutral to moderately alkaline.
COMPETING SERIES: This is the Devol series in the same family and the Abbie, Farry, Grandfield, Madge, and Wisby series in similar families. Devol soils contain less than 2 percent pebbles in the control section. Wisby soils have a mollic epipedon and are in a different moisture regime. Grandfield soils are fine-loamy in the textural control section and do not allow up to 15 percent pebbles in the profile. Abbie, Farry, and Madge soils have a mollic epipedon and are fine-loamy in the textural control section.
GEOGRAPHIC SETTING: Fortyone soils are on very gently sloping to moderately steep hillslopes of the Central Rolling Red Plains and Southern High Plains Breaks. They formed in loamy or sandy old alluvium. Slopes range from 1 to 15 percent. Mean annual precipitation ranges from 20 to 26 inches. Mean annual temperature ranges from 57 to 62 degrees F. Thornthwaite P-E index ranges from 32 to 44. Frost free days range from 180 to 210. Elevation ranges from 1500 to 2300 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abbie, Farry, Mansic, Oklark, Quinlan, and Woodward. Abbie and Farry soils are found on higher ridgetops, have a mollic epipedon, and are fine-loamy in the textural control section. Mansic and Oklark soils are found on similar areas, but have a mollic epipedon, contain greater than 15 percent calcium carbonate equivalent, and lack an argillic horizon. Quinlan and Woodward soils are found on lower side slopes, lack an argillic horizon, and are less than 40 inches to sandstone.
DRAINAGE AND PERMEABILITY: Fortyone soils are well drained. Runoff is very low to medium. Permeability is moderately rapid.
USE AND VEGETATION: Fortyone soils are used mainly for rangeland, but some less sloping areas are used for growing wheat and sorghums. Native vegetation is a mixed grass prairie.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains (MLRA-78C) and Southern High Plains Breaks (MLRA-77E) of northwestern Oklahoma and southern Kansas. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Woods County, Oklahoma; 1995.
REMARKS: Soil Interpretation Record: OK0417
These soils were formerly included with the Albion series.
Diagnostic horizons and features:
Ochric epipedon - The zone from the soil surface to a depth of approximately 7 inches (A horizon).
Argillic horizon - The zone from approximately 7 inches to 24 inches (Bt horizon).