LOCATION RHYMES TX

Established Series
MLG-KBH-JAG
11/2010

RHYMES SERIES

The Rhymes series consists of very deep, excessively drained, sandy soils that formed in loamy sediments overlain by recent windblown sands. These nearly level to gently sloping soils are on stream terraces. Slope ranges from 0 to 5 percent. Mean annual precipitation is about 864 mm (34 in) and the mean annual air temperature is about 21 degrees C (70 degrees F).

TAXONOMIC CLASS: Loamy, siliceous, active, hyperthermic Grossarenic Paleustalfs

TYPICAL PEDON: Rhymes fine sand, on an east facing, 3 percent slope in pastureland; elevation is 85 meters (280 feet). (Colors are for dry soil unless otherwise stated.)

A1--0 to 25 cm (0 to 10 in); pale brown (10YR 6/3) fine sand, brown (10YR 4/3) moist; single grained; loose, very friable; common fine roots; slightly acid; gradual smooth boundary.

A2--25 to 91 cm (10 to 36 in); light yellowish brown (10YR 6/4) fine sand, yellowish brown (10YR 5/4) moist; single grained; loose, very friable; common fine roots; slightly acid; clear smooth boundary.

E--91 to 142 cm (36 to 56 in); very pale brown (10YR 7/3) loamy sand, light yellowish brown (10YR 6/4) moist; single grained; loose, very friable; few fine roots; few medium distinct brownish yellow (10YR 6/6) masses of iron accumulation; slightly acid; abrupt smooth boundary. [combined thickness of the A and E horizons are 102 to 193 cm (40 to 78 in)]

Bt1--142 to 173 cm (56 to 68 in); very pale brown (10YR 7/3) fine sandy loam, pale brown (10YR 6/3) moist; moderate medium prismatic structure parting to moderate medium angular blocky; extremely hard, friable; few fine roots, common fine pores; common medium and coarse prominent yellowish red (5YR 5/8), strong brown (7.5YR 5/6) and brownish yellow (10YR 6/8) masses of iron accumulation; few distinct clay films on surfaces of peds; slightly acid; gradual smooth boundary.

Bt2--173 to 203 cm (68 to 80 in); very pale brown (10YR 7/3) sandy clay loam, very pale brown (10YR 7/3) moist; moderate fine and medium angular blocky structure; extremely hard, friable; few fine roots; few fine pores; common medium and coarse distinct strong brown (7.5YR 5/6) and brownish yellow (10YR 6/8) masses of iron accumulation; few distinct clay films on surfaces of peds; neutral. [combined thickness of the Bt horizons range from 51 to 127 cm (20 to 50 in)]

TYPE LOCATION: Karnes County, Texas; from the intersection of Farm Road 81 and Farm Road 2724 in Panna Maria, 1.5 miles north on Farm Road 2724 to the intersection with private ranch road, 1.0 mile east on private ranch road; 1100 ft east in pastureland. Helena, Texas USGS topographic quadrangle; Latitude: 28 degrees, 59 minutes, 11 seconds N; Longitude: 97 degrees, 53 minutes, 01 seconds W.; NAD 83.

RANGE IN CHARACTERISTICS:

Soil Moisture: A typic-ustic moisture regime. The soil moisture control section is dry in some or all parts for more than 90 days but less than 180 cumulative days in normal years. June through August and December through February are the driest months. These soils are intermittently moist in September through November and March through May.
Solum thickness is more than 203 cm (80in). Base saturation at the critical depth ranges from 60 to 100 percent.
Mean annual soil temperature: 22 to 24 degrees C (72 To 76 degrees F).
Depth to argillic horizon: 102 to 193 cm (40 to 78 in)
Depth to secondary calcium carbonate: 51 to 203 cm (20 to 80 in)Particle-size control section (weighted average)
Clay content: 18 to 35 percent

A Horizon
Hue: 7.5YR or 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: fine sand, loamy sand or loamy fine sand
Reaction: moderately acid to neutral

E Horizon
Hue: 7.5YR or 10YR
Value: 6 to 8
Chroma: 2 to 6
Texture: fine sand, loamy sand or loamy fine sand
Redox concentrations: none to common, fine or medium, faint or distinct, yellow or brown masses of iron accumulation
Reaction: moderately acid to neutral

Bt Horizon
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 2 to 6
Texture: fine sandy loam or sandy clay loam
Clay content: 18 to 35 percent
Redox concentrations: few to common, fine or medium, faint to prominent, shades of brown, yellow or red
Redox depletions: few, fine, prominent, distinct, gray, in soil matrix
Reaction: moderately acid to slightly alkaline

Some pedons have a BC or BCk Horizon
Hue: 7.5YR or 10YR
Value: 5 to 8
Chroma: 2 to 6
Texture: fine sandy loam or sandy clay loam
Clay content: 15 to 30 percent
Identifiable secondary carbonate: up to 4 percent, fine or medium, concretions and masses
Reaction: moderately acid to moderately alkaline

COMPETING SERIES: These are the Bobillo and Hitilo series. Similar soils include Lopeno, Nueces, Nusil, Padina, Patilo and Sarita series. Bobillo soils: have an ustic aridic moisture regime.
Hitilo soils: have base saturation less than 60 percent and support woody vegetation dominated by blackjack and post oak.
Lopeno, Nueces, and Sarita soils: have mixed mineralogy. In addition, Lopeno soils are moist for longer periods in the soil moisture control section.
Nusil soils: have arenic surface layers.
Padina and Patilo soils: have a thermic temperature regime.

GEOGRAPHIC SETTING:
Parent material: fine sands and loamy fine sands derived from recent eolian origin over loamy sediments
Landform: stream terrace
Slope: 0 to 5 percent
Mean annual air temperature range: 21 to 23 degrees C (70 to 74 degrees F).
Mean annual precipitation range: 610 to 864 mm (24 to 34 in)
Frost-free period: 270 to 290 days
Elevation: 23 to 137 m (75 to 450 ft)
Thornthwaite annual P-E indices: 31 to 44

GEOGRAPHICALLY ASSOCIATED SOILS: These include the competing Hitilo and Nusil soils and the Leming, Papalote, Poth, and Wilco soils.
Hitilo soils: are on slightly higher positions on sandy formations of the Claiborne group.
Nusil soils: are on similar to slightly lower positions.
Leming soils: are on similar positions and have a clayey particle-size control section.
Poth, and Wilco soils: are on slightly higher positions and have clayey subsoils, in addition Poth soils have an arenic surface layer and Wilco soils have a sandy surface layer less than 50 cm (20 in) thick.
Papalote soils: are on similar to slightly lower positions and have a sandy surface layer less than 50 cm (20) inches thick.

DRAINAGE AND PERMEABILITY: Rhymes soils are somewhat excessively drained in the A and E horizons and well drained in the Bt horizon. Permeability is rapid in the fine sand A and E horizons, moderately rapid in the loamy fine sand A and E horizons and moderately slow in the Bt horizons. Runoff is negligible on slopes less than 1 percent, very low on 1 to 3 percent slopes, and low on 3 to 5 percent slopes. A perched water table occurs at the contact of the Bt horizon in some years. When present, the water table occurs after heavy rainfall during the winter and spring months. Typically the water table is less than 6 inches thick and persists for very brief or brief periods.

USE AND VEGETATION: The soil is mainly used for rangeland. A few areas are in irrigated cropland or pastureland. The most common crops are peanuts, vegetables or watermelons. Native vegetation consists of grasses such as little bluestem, brownseed paspalum, Indiangrass, switchgrass, tanglehead, fringeleaf paspalum, and hooded windmillgrass. Woody vegetation consists mainly of live oaks, scattered mesquite, pricklypear, and catclaw acacia. (Ecological site name: Sandy 22-35" Pz;
Ecological site number: R083AY406TX)

DISTRIBUTION AND EXTENT: Northern Rio Grande Plain, Texas: LRR I; MLRA 83A. The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Karnes County, Texas, 1992. The name is from a small creek in northern Karnes County.

REMARKS: The series was formerly included in the Sarita series. Areas of iron depletion are relic and are not due to present day extended wetness. Water table studies on similar soils indicate saturation is for very brief to brief periods.

Diagnostic horizons and features recognized in this pedon are:

Particle size control section: 142 to 193 cm (56 to 76 in).

Ochric epipedon: 0 to 142 cm (0 to 56 in). (A and E horizons)

Grossarenic feature: 0 to 142 cm (0 to 56 in). (A and E horizons)

Argillic horizon: 142 to 203 cm (56 to 80 in). (Bt horizons)

ADDITIONAL DATA: National Soil Survey Laboratory data from Atascosa County S76TX-013-002 (40A35538-35542); Texas A&M Soil characterization lab from type location S92TX 255-002.

TAXONOMIC VERSION: Keys to Soil Taxonomy, Eleventh Edition, 2010

National Cooperative Soil Survey
U.S.A.