LOCATION ARNETT OKEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, thermic Typic Haplustalfs
TYPICAL PEDON: Arnett sandy loam--on 3 percent slope in pasture. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 7 inches; brown (7.5YR 4/4) sandy loam, dark brown (7.5YR 3/4) moist; weak fine and medium granular structure; hard, friable; many very fine, fine, and few medium roots; common very fine, fine and few medium pores; 7 percent by volume rounded quartzite gravel; 40 percent of surface is covered with gravel; noneffervescent; neutral; abrupt smooth boundary. (4 to 13 inches thick)
Btl--7 to 11 inches; reddish brown (2.5YR 4/4) clay loam, dark reddish brown (2.5YR 3/4) moist; strong medium and coarse prismatic structure parting to strong medium subangular blocky; very hard, firm; common very fine and fine roots; common very fine, fine, and few medium pores; many prominent clay films on surface of peds; 3 percent by volume rounded quartzite gravel; noneffervescent; moderately alkaline; clear smooth boundary.
Bt2--11 to 17 inches; reddish brown (2.5YR 5/4) clay loam, reddish brown (2.5YR 4/4) moist; strong medium and coarse prismatic structure parting to strong medium subangular blocky; very hard, firm; common very fine and fine roots; common very fine, fine, and few medium pores; many prominent clay films on surface of peds; 5 percent by volume rounded quartzite gravel; noneffervescent; moderately alkaline; abrupt wavy boundary. (combined thickness of the Bt horizon is 8 to 40 inches)
2Bt3--17 to 31 inches; red (2.5YR 5/6) gravelly sandy clay loam, red (2.5YR 4/6) moist; moderate coarse prismatic structure; hard, friable; common very fine and fine roots; many very fine, fine and common medium and coarse pores; common distinct clay films on surface of peds; 34 percent by volume rounded quartzite gravel; very slightly effervescent; moderately alkaline; gradual wavy boundary. (10 to 30 inches thick)
2BC--31 to 43 inches; red (2.5YR 5/8) gravelly coarse sandy loam, red (2.5YR 4/8) moist; moderate coarse prismatic structure; hard, friable; common very fine and fine roots; many very fine, fine and common medium and coarse pores; 25 percent by volume rounded quartzite gravel; slightly effervescent; moderately alkaline; clear wavy boundary. (5 to 20 inches thick)
2Ck--43 to 57 inches; yellowish red (5YR 5/6) gravelly coarse sandy loam stratified with sandy clay loam, yellowish red (5YR 4/6) moist; massive; few fine roots; few fine pores; 23 percent by volume rounded quartzite gravel and 1 percent angular conglomerate cobbles; few films and common fine concretions of calcium carbonate in seams that are wavy and discontinuous; strongly effervescent; moderately alkaline; clear wavy boundary. (0 to 25 inches thick)
3Ck--57 to 84 inches; 70 percent reddish brown (2.5YR 5/4) and 30 percent reddish yellow (5YR 6/6) stratified clay, sandy clay loam, and very fine sandy loam in layers 2 to 6 inches thick, 70 percent reddish brown (2.5YR 4/4) and 30 percent yellowish red (5YR 5/6) moist; massive; few fine roots; few fine pores; 6 percent by volume rounded quartzite gravel; few films and common fine and medium concretions of calcium carbonate in seams that are wavy and discontinuous; violently effervescent; moderately alkaline; clear wavy boundary.
TYPE LOCATION: Jackson County, Oklahoma; from the intersection of Oklahoma State Highway 5 and State Highway 6 in Eldorado; 2.4 miles southwest along State Highway 6; 0.85 mile north along county road; 250 feet west in pasture. (850 feet south and 250 feet west of the northeast corner of section 22, TlS, R24W); USGS Eldorado, OK-TX Quadrangle; (Latitude: 34N, 27, 44; Longitude: 99W, 41, 30).
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 60 inches. Depth to secondary carbonates ranges from 10 to 50 inches with a calcium carbonate equivalent from 5 to 15 percent.
The A horizon has hue of 5YR to 10YR, value of 4 or 5, and chroma of 3 or 4. A horizons with value of 4 (3 moist) and chroma of 3, are less than 10 inches thick. Texture is sandy loam, loam, or coarse sandy loam. Gravel content ranges from 5 to 15 percent by volume. Reaction ranges from slightly acid to slightly alkaline.
The Bt or Btk horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4 to 6. Texture is sandy clay loam or clay loam. Gravel content ranges from 5 to 15 percent by volume. Reaction ranges from neutral to moderately alkaline. Effervescence ranges from noneffervescent to strongly effervescent.
The 2Bt, or 2Btk horizon, where present, have hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4 to 6. Texture is gravelly sandy clay loam or gravelly clay loam. Gravel content ranges from 15 to 35 percent by volume. Reaction ranges from neutral to moderately alkaline. Effervescence ranges from noneffervescent to strongly effervescent.
The 2BC or 2BCk horizon, where present, has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4 to 8. Texture is gravelly coarse sandy loam, gravelly sandy clay loam or gravelly clay loam. Gravel content ranges from 15 to 35 percent by volume. Reaction is slightly alkaline or moderately alkaline. Effervescence ranges from slightly to violently effervescent.
The 2C or 2Ck horizons have hue of 2.5YR to 7.5YR, value of 4 to 8, and chroma of 4 to 8. Texture is variable with stratified layers ranging from loamy coarse sand to gravelly clay loam with gravel ranging from 1 to 35 percent by volume. Reaction is moderately alkaline. Effervescence ranges from slight to violent.
The 3C or 3Ck horizons, where present, have hue of 2.5YR to 7.5YR, value of 4 to 8, and chroma of 4 to 8. Texture is variable with stratified layers ranging from loamy coarse sand to clay with gravel ranging from 1 to 15 percent by volume. Reaction is moderately alkaline. Effervescence ranges from slight to violent.
Some pedons below 60 inches have a densic layer of weathered Permian age redbed sediments with texture of clay loam or clay, or this layer may contain stones or boulder size fragments of conglomerate.
COMPETING SERIES: These are the Cobb, Decobb, Grandfield, Grandmore, Honeycreek, Hye, Lou, McKnight, Menard, and Rochelle series in the same family. Cobb soils are moderately deep to Cr horizons of weakly cemented sandstone. Decobb, Grandfield, and Grandmore soils have a solum more than 60 inches thick and formed in sediments containing less than 5 percent gravel. In addition, Grandmore soils have a discontinuity of low chroma mottled clay loam and clay within 60 inches of the surface. Honeycreek soils are deep to weathered schist bedrock. Hye soils are moderately deep to sandstone bedrock. Lou soils are moderately deep to weathered granite saprolite. McKnight soils are deep to a Cr horizon of weathered Permian shale or sandstone. Menard soils contain fragments of limestone and formed in Cretaceous age sediments. Rochelle soils have horizons below 30 inches that contain 60 to 85 percent gravel and 0 to 10 percent cobbles by volume.
GEOGRAPHIC SETTING: Arnett soils are on very gently sloping to strongly sloping stream terraces. Slopes are mainly 1 to 5 percent but range to 12 percent. These soils formed in loamy over gravelly alluvial sediments of Pleistocene age. Mean annual precipitation ranges from 20 to 28 inches. Mean annual air temperature ranges from 59 to 64 degrees F. Frost free days range from 200 to 230 days and elevation ranges from 1,000 to 2,100 feet. Thornthwaite annual P-E index ranges from 32 to 44.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aspermont, Hardeman, Farry, Frankirk, Tilvern, and Vernon series. These soils contain less gravel in the solum. Aspermont soils have a fine-silty particle size control section and are on lower landscape positions. Hardeman soils have a coarse-loamy particle-size control section and are on recent terraces lower in the landscape. Farry and Frankirk soils have a mollic epipedon and are on similar to slightly lower landscape positions. Tilvern and Vernon soils have a fine particle-size control section and are underlain by Cr horizons of weathered shale. These soils are on nearby lower, dissected landscape positions.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is very low on 1 to 3 percent slopes, low on 3 to 5 percent slopes, and medium on 5 to 12 percent slopes.
USE AND VEGETATION: Mainly used as cropland or pasture with some areas in rangeland. Some areas are surface mined for road aggregate and other construction materials. Major crops grown are forage sorghums and small grains. Native vegetation is a mixture of tall and midgrasses. Mesquite will invade if not controlled.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains of southwestern Oklahoma and possibly north central Texas; LRR H (MLRA 78B, MLRA78C). The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas.
SERIES ESTABLISHED: Jackson County, Oklahoma; 2000.
REMARKS: The Arnett series was included with the Miles series in the Jackson County, Oklahoma 1961 soil survey. The series was originally established in Harmon County, Oklahoma in 1941 and later placed on the inactive soil list. The series is being reactivated to describe soils similar to the original concept of the series.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 7 inches (Ap horizon).
Argillic horizon - 7 to 31 inches (Btl, Bt2, and 2Bt3 horizons).
The assignment of the cation-exchange activity class is based on lab data from Jackson County, OK.
Range site: Sandy Loam Prairie; 078CY110TX.
ADDITIONAL DATA: Jackson County, OK, NSSL lab No. (S97OK-065-001).
TAXONOMIC VERSION: Keys to Soil Taxonomy, Tenth Edition, 2006.