LOCATION SEGNO                   TX

Established Series
BJW-KBH-AKS
07/2019

SEGNO SERIES

The Segno series consists of very deep, well drained soils that formed in loamy fluviomarine deposits of Pleistocene age. Slopes range from 1 to 5 percent. Mean annual temperature is about 20 degrees C (68 degrees F), and mean annual precipitation is about 1215 mm (48 in). (Colors are for moist soil unless otherwise stated.)

TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, thermic Typic Paleudalfs

TYPICAL PEDON: Segno fine sandy loam- woodland (Colors are for moist soil unless otherwise stated.)

A--0 to 11 cm, (0.0 to 4.3 in); dark grayish brown (10YR 4/2), fine sandy loam; weak fine granular structure; loose; many very fine roots throughout; common fine, medium and coarse roots throughout; common fine interstitial pores; strongly acid; gradual smooth boundary. (8 to 15 cm [3 to 6 in] thick)

E--11 to 42 cm, (4.3 to 16.5 in); brown (10YR 5/3), very fine sandy loam; weak fine granular structure; very friable; many very fine roots throughout; common fine roots throughout; common very fine vesicular pores; very strongly acid; gradual smooth boundary. (12 to 27 cm [4.7 to 10.6 in] thick)

BE--42 to 81 cm, (16.5 to 31.9 in); yellowish brown (10YR 5/6), very fine sandy loam; weak fine granular structure; friable; common fine roots throughout; 20 percent brown (10YR 5/3) E material; very strongly acid; gradual smooth boundary. (16 to 43 cm [6.3 to 16.9 in] thick)

Bt--81 to 110 cm, (31.9 to 43.3 in); 50 percent yellowish brown (10YR 5/6) and 40 percent yellowish brown (10YR 5/4), loam; weak medium subangular blocky structure; firm; common very fine, fine, and medium roots throughout; common very fine vesicular pores; 15 percent distinct yellowish brown (10YR 5/6) clay films on all faces of peds; 1 percent medium ironstone nodules in matrix; 10 percent coarse distinct strong brown (7.5YR 5/8), moist, masses of oxidized iron with diffuse boundaries in matrix; very strongly acid; clear smooth boundary. (24 to 85 cm [9.4 to 33.5] thick)

Btc1--110 to 157 cm, (43.3 to 61.8 in); yellowish brown (10YR 5/6), silt loam; moderate medium subangular blocky structure; firm; common very fine, fine and medium roots throughout; common very fine vesicular pores; 15 percent distinct yellowish brown (10YR 5/6) clay films on all faces of peds; 8 percent medium ironstone nodules in matrix; 8 percent medium prominent red (2.5YR 4/8), moist, masses of oxidized iron with sharp boundaries in matrix and 20 percent coarse prominent light yellowish brown (2.5Y 6/3), moist, iron depletions with diffuse boundaries in matrix; very strongly acid; gradual smooth boundary. (combined thickness of the Btc horizons is 45 to 116 cm [17.7 to 45.7 in])

Btc2--157 to 203 cm, (61.8 to 79.9 in); yellowish brown (10YR 5/8), loam; moderate medium subangular blocky structure; firm; few very fine roots; common very fine vesicular pores; 15 percent distinct yellowish brown (10YR 5/6) clay films on all faces of peds; 10 percent medium ironstone nodules in matrix; 15 percent coarse prominent light brownish gray (2.5Y 6/2), moist, iron depletions with clear boundaries in matrix and 25 percent coarse prominent red (2.5YR 4/8), moist, masses of oxidized iron with sharp boundaries in matrix; very strongly acid.

TYPE LOCATION:
Liberty County, Texas; from the intersection of Texas Highway 105 and Fenner Street in Clevelend; about 0.3 miles north on Fenner Street to FM 787; 2.9 miles east on FM 787 to intersection with County Road 2206; 0.8 mile north on County Road 2206 to pipeline; 0.75 mile east on pipeline to railroad; 500 feet northeast.

USGS topographic quadrangle: Cleveland
Latitude: 30 degrees 22 minutes 19.40 seconds N; Longitude: 95 degrees 1 minutes 20.10 seconds W; Datum: NAD 83.

RANGE IN CHARACTERISTICS:

Soil Moisture: An udic soil moisture regime. The soil moisture control section is 10 to 30 cm (4 to 12 in) below the soil surface and remains dry less than 90 cumulative days in most years.
Mean annual soil temperature: 20.6 to 21.7 degrees C (69 to 71 degrees F)

Particle-size control section (weighted average)
Clay content: 18 to 31 percent
CEC/clay ratio: .25 to 0.35

A Horizon
Hue: 10YR
Value: 3 to 5
Chroma: 1 or 2
Texture: loamy fine sand, fine sandy loam, very fine sandy loam, or loam
Clay content: 4.2 to 14.2 percent
Base saturation: 26 to 72
Reaction: extremely acid to strongly acid

E Horizon
Hue: 10YR
Value: 5 to 7
Chroma: 3 or 4
Texture: loamy fine sand, fine sandy loam, very fine sandy loam, or loam
Ironstone nodules: 0 to 5 percent
Clay content: 4 to 14.2 percent
Base saturation: 35 to 75
Reaction: very strongly acid to moderately acid

BE Horizon (Bt/E where present)
Hue: 10YR or 7.5YR
Value: 5 or 6
Chroma: 4 to 8
Texture: fine sandy loam or loam
Ironstone nodules: 0 to 5 percent
Clay content: 11 to 20 percent
Redox concentrations: amount- 0 to 8 percent, shades-brown
Base saturation: 39 to 63
Reaction: very strongly acid to moderately acid

Bt Horizon
Hue: 10YR or 7.5YR
Value: 5 or 6
Chroma: 4 to 8
Texture: loam, silt loam, sandy clay loam or clay loam
Ironstone nodules: 0 to 8 percent
Clay content: 20 to 34 percent
Redox concentrations: amount-5 to 20 percent, shades-brown or yellow
Base saturation: 34 to 65
Reaction: very strongly acid to moderately acid

Btc Horizon
Hue: 10YR or 7.5YR
Value: 5 or 6
Chroma: 4 to 8
Texture: loam, silt loam, sandy clay loam, or clay loam
Ironstone nodules: 5 to 15 percent
Clay content: 20 to 34 percent
Redox concentrations: amount-5 to 50 percent, shades-brown, yellow or red
Redox depletions: amount-5 to 20 percent, shades-brown and gray
Base saturation: 43 to 75
Reaction: very strongly acid or strongly acid

COMPETING SERIES: These are the Attoyac(TX), Bistineau (LA), Caledonia (MS), and Elrose (TX) series. Similar soils include the Otanya (TX) and Pinetucky (TX) series.
Attoyac, Bistineau, Caledonia, and Elrose soils: have argillic horizons with color redder than 7.5YR.
Otanya and Pinetucky soils: have less than 35 percent base saturation in the lower part of the argillic horizon

GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from the Lissie Foramtion of Pleistocene age
Landscape: inland dissected coastal plain
Landform: interfluve
Slope: 1 to 5 percent
Mean annual air temperature: 19.5 to 20.6 degrees C (67 to 69 degrees F).
Mean annual precipitation: 1219 to 1422 mm (48 to 56 in)
Precipitation pattern: uniform throughout the year with slight peaks in the spring and summer
Frost-free period: 240 to 300 days
Elevation: 18.3 to 49 m (60 to 160 ft)
Thornthwaite annual P-E indices: 68 to 80

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Splendora (TX), Sorter (TX), Waller (TX), and the tentative Westcott (T)(TX) and Tarkington (T)(TX) series.
Splendora soils: moderately well drained; in a slightly lower position on a similar landform
Sorter and Waller soils: poorly drained; on concave landforms
Westcott soils: moderately well drained; in a coarse-loamy particle-size family; on a similar landform
Tarkington soils: are moderately well drained; in a coarse-loamy particle-size family; on pimple mounds

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Runoff: low to medium on 1 to 3 percent slopes; high on 3 to 5 percent slopes.

USE AND VEGETATION: Soils are mostly used for pasture and forest. Pastures are mainly bermudagrass. Small areas are used for growing corn, peanuts, sweet potatoes, peaches, melons, and other vegetable crops. Forest vegetation includes loblolly, shortleaf, slash and longleaf pines, sweetgum, red oak, hickory, dogwood, and holly trees.
Ecological sites assigned to phases and components of this series are listed below. Current ecological site assignments are in Web Soil Survey. Components of this series include the following ecological sites: Loamy Upland

DISTRIBUTION AND EXTENT:
General location: Western Coastal Plain from Texas to Louisiana
Land Resource Region: T (Atlantic and Gulf Coast Lowland Forest and Crop Region)
Major Land Resource Area: 150A (Gulf Coast Prairies)
Extent: large

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

SERIES ESTABLISHED: Polk County, Texas; 1930.

REMARKS: The series type location was moved during the update of MLRA 152B to better represent the series concept. The previous type location based on pedon S64TX-170-4 is located in an area close to the Willis Formation and Lissie Formation contact. The majority of the Segno soils are mapped over the Lissie Formation. The Lissie Formation areas typically have less than 5 percent plinthite. Some areas were correlated to the Otanya series in previous surveys. Diagnostic horizons and features in this pedon are:

Ochric epipedon: 0 to 42 cm (0 to 16.5 in) (A and E horizons)
Argillic horizon: 42 to 203 cm (31.9 to 80 in) (Bt/E, Bt, Btc horizons)
Glossic horizon: 42 to 81 cm, (16.5 to 31.9 in)

ADDITIONAL DATA: Kellogg Soil Survey Lab data available on pedon S12TX29111035. Data from 3 pedons in Montgomery County are published in SSIR-30 (S64TX-170-3 and S64TX-170-4) and pedon S78TX-339-001 in Characterization Data for Selected Texas Soils, Texas Agricultural Experiment Station, January 1986.

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014.

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National Cooperative Soil Survey
U.S.A.