LOCATION CONDIDO TX
Established Series
Rev. RM-CLN
02/2018
CONDIDO SERIES
The Condido series consists of soils that are shallow to a petrocalcic horizon. These well drained, very slowly permeable clayey soils formed in residuum derived from tuffaceous, weakly cemented siltstone sediments of the Catahoula Formation. These soils are on nearly level uplands. Slopes range from 0 to 2 percent.
TAXONOMIC CLASS: Clayey, smectitic, hyperthermic, shallow Petrocalcic Paleustolls
TYPICAL PEDON: Condido clay--pasture. (Colors are for dry soil unless otherwise stated)
A1--0 to 6 inches; black (10YR 2/1) clay, black (10YR 2/1) moist; moderate medium angular blocky structure; very hard, very firm, very sticky, very plastic; many very fine roots; few very fine and fine tubular pores; neutral; abrupt smooth boundary. (4 to 12 inches thick)
A2--6 to 15 inches; very dark gray (10YR 3/1) clay, very dark gray (10YR 3/1) moist; strong medium angular blocky structure; very hard, very firm, very sticky, very plastic; few fine roots; few very fine and fine tubular pores; neutral; abrupt wavy boundary. (0 to 10 inches thick)
A3--15 to 18 inches; very dark gray (10YR 3/1) gravelly clay, very dark gray (10YR 3/1) moist; strong fine and medium angular blocky structure; very hard, very firm, very sticky, very plastic; about 20 percent by volume white (10YR 8/1) platelike fragments in the lower part, fragments are 1/4 to 1 inch across; the soil material is noncalcareous, fragments are strongly effervescent; moderately alkaline; abrupt wavy boundary. (0 to 8 inches thick)
Bkm--18 to 24 inches; white (10YR 8/1) strongly cemented caliche, very pale brown (10YR 8/3) moist; massive; laminar cap is 1/4 to 1/2 inch thick; many very fine and fine roots matted on surface of laminar cap; calcium carbonate decreases in lower part; violently effervescent; moderately alkaline; gradual wavy boundary. (4 to 16 inches thick)
BCk--24 to 40 inches; very pale brown (10YR 8/3) weakly cemented calcareous siltstone of silt loam texture, pale brown (10YR 6/3) moist; massive; calcium carbonate equivalent is 35 percent; about 25 percent by volume films and threads of calcium carbonate along horizontal beds, about 10 percent by volume masses of calcium carbonate; violently effervescent; moderately alkaline; gradual wavy boundary. (10 to 30 inches thick)
2Cr--40 to 80 inches; very pale brown (10YR 8/3) weakly cemented siltstone of silt loam texture, very pale brown (10YR 7/3) moist; massive; few films and threads of calcium carbonate in upper part along horizontal beds; moderately alkaline.
TYPE LOCATION: Karnes County, Texas; from the intersection of U.S. Highway 181 and Farm Road 99 in Karnes City; 8.2 miles west on Farm Road 99 to county road in Coy City; 3 miles north on county road; 0.5 mile northeast in pasture. (Latitude 28N, 51, 10; Longitude 98W, 03, 57)
RANGE IN CHARACTERISTICS: The solum thickness ranges from 10 to 20 inches over a petrocalcic horizon.
The A1 and A2 horizons have hue of 10YR, value of 2 to 4, and chroma of 1 or 2, or a neutral color of 2/0. Clay content ranges from 40 to 55 percent. Reaction is neutral or slightly alkaline.
The A3 horizon has hue of 10YR, value of 2 to 5, and chroma of 1 or 2, or a neutral color of 2/0. Angular and platelike caliche fragments range from 15 to 25 percent by volume. Fragments are 1/8 to 1 inch wide and 1/8 to 1/2 inch thick and 1/4 to 1 1/2 inches long. Some of these fragments slake in water. Reaction is slightly alkaline or moderately alkaline.
The Bkm horizon has hue of 7.5YR or 10YR, value of 6 to 8, and chroma of 1 to 4. It is moderately or strongly cemented caliche interbedded with noncalcareous siltstone in the lower part. It has a laminar cap that is 1/8 to 1-1/2 inches thick. Reaction is slightly alkaline or moderately alkaline and calcareous.
The BCk horizon has hue of 7.5 YR, 10YR, or 2.5Y, value of 7 or 8 , and chroma of 0 to 3. It is weakly cemented, calcareous siltstone of silt loam or loam texture. This layer slakes in water. Calcium carbonate films, threads, and soft masses range form 5 to 35 percent by volume; calcium carbonate films and threads range from thin films to 1/2 inch thick and are 1/2 to 8 inches apart and decrease in the lower part. Calcium carbonate equivalent ranges from 15 to 45 percent.
The 2Cr horizon has hue of 7.5YR, 10YR, or 2.5Y, value of 6 to 8, and chroma of 2 to 4. It is weakly cemented siltstone with silt loam or loam texture. This material slakes in water. Some pedons have a few thin lenses of calcium carbonate mainly in the upper part of the horizon.
COMPETING SERIES: There are no series in the same family. Soils in similar families are the
Jardin,
Quihi,
Parrita,
Pavelek and
Yologo series. Jardin soils have a loamy control section and mixed mineralogy. The Quihi soils have a clayey-skeletal control section. The Parrita soils have mixed mineralogy and an argillic horizon. The Pavelek soils are calcareous in the solum. The Yologo soils have a loamy-skeletal particle-size control section.
GEOGRAPHIC SETTING: Condido soils are on level to nearly level, plane to slightly convex surfaces on uplands. Slopes range from 0 to 2 percent. The soil formed in clayey materials over thick beds of noncalcareous, weakly cemented siltstone of the Catahoula formation. Mean annual precipitation ranges from 28 to 32 inches. Mean annual temperature ranges from 70 degrees to 74 degrees F. Frost free period ranges from 275 to 290 days. Elevation ranges from 380 to 495 feet. Thornthwaite P-E index ranges from 31 to 44.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the similar
Pavelek,
Ecleto,
Fashing, and
Weigang soils as well as
Eloso,
Rosenbrock, and
Tordia soils. Pavelek, Ecleto, Fashing, and Weigang soils occur on similar positions. Eloso, Rosenbrock, and Tordia soils occur on similar to slightly lower positions in the landscape. In addition, Fashing soils do not have a petrocalcic horizon. Ecleto and Weigang soils have argillic horizons. Also, Weigang soils have loamy control sections. Eloso, Rosenbrock, and Tordia soils have a fine particle-size control section and are more than 20 inches deep.
DRAINAGE AND PERMEABILITY: Condido soils are well drained. Permeability is very slow. Runoff is low on slopes of less than 1 percent and medium on slopes of 1 to 2 percent.
USE AND VEGETATION: Used mainly as rangeland and wildlife habitat. Scattered areas are cultivated with small grains and grain sorghum. Some areas are used as bermudagrass pasture and hayland. Native grasses include Texas wintergrass, sideoats grama, bristlegrasses, Hall's panicum, Texas grama, threeawns, and red grama. Woody vegetation is mainly agarito, prickly pear, lotebush, mesquite, spiny hackberry, persimmon, blackbrush, and live oak.
DISTRIBUTION AND EXTENT: In the northeast part of the Rio Grande Plain of Texas (MLRA 83A). The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Karnes County, Texas 1989. The name is from a small stream in Karnes County.
REMARKS: These soils were formerly included in the Fashing, Pettus, and Weigang series. Some of the materials in the Bkm horizon slake in water, however, this horizon looks and acts like a petrocalcic. Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from surface to 18 inches.
Petrocalcic horizon - from 18 to 24 inches.
Cr feature- This is not a paralithic layer. Although it slakes in water, it has cracks less than 4 inches apart.
ADDITIONAL DATA: NSSL S88TX-255-003
National Cooperative Soil Survey
U.S.A.