LOCATION PLUMGROVE TX

Tentative Series
JKW-RM
07/2014

PLUMGROVE SERIES

The Plumgrove series consists of somewhat poorly drained soils that formed in loamy fluviomarine deposits from the Lissie Formation. These soils are on broad interfluves. Slopes range from 0 to 1 percent. The mean annual precipitation is about 1397 mm (55 in) and the mean annual temperature is about 19.5 degrees C (67 degrees F).

TAXONOMIC CLASS: Fine-silty, siliceous, active, thermic Oxyaquic Paleudalfs

TYPICAL PEDON: Plumgrove silt loam in an area of Westcott-Plumgrove complex, 0 to 1 percent slopes, at an elevation of 46 m (150 ft). When described the soil was moist throughout.(Colors are for moist soil unless otherwise noted).

Ap--0 to 12 cm, (0.0 to 4.7 inches); dark grayish brown (10YR 4/2) silt loam; weak fine subangular blocky structure; slightly hard, very friable; many fine and medium and common coarse roots throughout; common fine interstitial pores; strongly acid, pH 5.4; clear smooth boundary.(8 to 22 cm [3 to 9 in] thick)

E--12 to 71 cm, (4.7 to 28.0 inches); light yellowish brown (10YR 6/4) loam; weak fine subangular blocky structure; slightly hard, very friable; many fine and common medium roots throughout; common very fine tubular pores; about 30 percent pale brown (10YR 6/3) albic tongues; 1 percent fine distinct light brownish gray (10YR 6/2), moist, iron depletions with clear boundaries in matrix surrounding redox concentrations; 3 percent fine distinct dark brown (10YR 3/3), moist, masses of oxidized iron with diffuse boundaries lining pores; very strongly acid, pH 4.8; clear smooth boundary. (14 to 83 cm [6 to 33 in] thick)

Bt/E1--71 to 105 cm, (28.0 to 41.3 inches); yellowish brown (10YR 5/6) loam; moderate medium angular blocky structure; hard, friable; common very fine roots throughout; common very fine tubular pores; 10 percent yellowish brown (10YR 5/6), moist, clay films on all faces of peds; about 20 percent pale brown (10YR 6/3) albic tongues; 2 percent medium dark yellowish brown (10YR 3/6), moist, ironstone nodules in matrix; 20 percent coarse prominent red (2.5YR 5/8), moist, masses of oxidized iron with sharp boundaries in matrix; 20 percent coarse prominent gray (10YR 6/1), moist, iron depletions with clear boundaries in matrix surrounding redox concentrations; very strongly acid, pH 5.0; gradual wavy boundary. (9 t 88 cm [4 to 35 in] thick)

Bt/E2--105 to 157 cm, (41.3 to 61.8 inches); brownish yellow (10YR 6/6) loam; moderate medium angular blocky structure; hard, firm; few very fine roots throughout; common very fine tubular pores; ; 15 percent brownish yellow (10YR 6/6), moist, clay films on all faces of peds; about 20 percent light brownish gray (10YR 6/2) albic tongues; 2 percent medium dark yellowish brown (10YR 3/6), moist, ironstone nodules in matrix; 25 percent coarse prominent gray (10YR 6/1), moist, masses of oxidized iron with diffuse boundaries in matrix surrounding redox concentrations; 30 percent coarse prominent red (2.5YR 5/8), moist, masses of oxidized iron with sharp boundaries in matrix; strongly acid, pH 5.2; gradual wavy boundary. (25 to 60 cm [10 to 24 in] thick)

Btg/E--157 to 203 cm, (61.8 to 79.9 inches); light gray (10YR 7/1) loam; moderate coarse subangular blocky structure; hard, firm; few very fine roots throughout; common fine tubular pores; 10 percent light yellowish brown (10YR 6/4), moist, clay films; about 15 percent light brownish gray (10YR 6/2) albic tongues; 15 percent coarse prominent gray (N 6/0), moist, iron depletions with clear boundaries on surfaces along pores; 20 percent coarse prominent brownish yellow (10YR 6/6), moist, masses of oxidized iron with diffuse boundaries in matrix surrounding redox concentrations; 25 percent coarse prominent red (2.5YR 4/8), moist, masses of oxidized iron with sharp boundaries in matrix; strongly acid, pH 5.6.

TYPE LOCATION: Liberty County, Texas, Liberty County, Texas; from the intersection of Texas Highway 105 and County Road 2212; east 0.75 mile on County Road 2212; 185 feet north. Latitude: 30 degrees, 21 minutes, 60 seconds N; Longitude: 94 degrees, 59 minutes, 49 seconds W; WGS84; U.S.G.S Quad: Tarkington Prairie, Texas

RANGE IN CHARACTERISTICS:
Soil Moisture: An udic soil moisture regime. The soil moisture control section is 20 to 60 cm (8 to 24 in) below the soil surface, which remains moist in some or all parts from more than 90 cumulative days in normal years.
Mean annual soil temperature: 20.6 to 21.7 (69 to 71 degrees F)
Particle-size control section (weighted average)
Clay content: 10 to 18 percent
Percent sands larger than very fine: 8 to 14

Ap or A (where present) Horizon
Hue: 10YR
Value: 4 or 5
Chroma: 2
Texture: very fine sandy loam, loam, or silt loam
Redox concentrations: amount-0 to 2 percent, shades-brown
Reaction(pH): very strongly acid to moderately acid (4.5 to 6.0)

E or EB (where present) Horizon
Hue: 10YR
Value: 5 or 6
Chroma: 2 to 6
Texture: very fine sandy loam, loam, or silt loam
Redox concentrations: amount-0 to 5 percent, shades-brown
Redox depletions: amount-0 to 5 percent, shades-gray
Reaction(pH): very strongly acid (4.5 to 5.0)

Bt/E Horizon
(upper part)
Hue: 10YR
Value: 5 or 6
Chroma: 3 to 6
Texture: loam or silt loam
Redox concentrations: amount-10 to 25 percent, shades-brown, yellow or red
Redox depletions: amount-0 to 15 percent, shades-gray
Reaction(pH): extremely acid to strongly acid (3.5 to 5.5)

Bt/E Horizon
(lower part)
Hue: 10YR
Value: 5 or 6
Chroma: 3 to 6
Texture: loam or silt loam, or clay loam
Redox concentrations: amount-10 to 40 percent, shades-brown, yellow or red (red redox are more than 20 percent)
Redox depletions: amount-2 to 15 percent, shades-gray
Reaction(pH): extremely acid to strongly acid (3.5 to 5.5)

Btg/E Horizon
(lower part)
Hue: 10YR
Value: 6 or 7
Chroma: 1 or 2
Texture: loam or silt loam, silty clay loam, or clay loam
Redox concentrations: amount-10 to 40 percent, shades-brown, yellow or red (red redox are more than 20 percent)
Redox depletions: amount-2 to 20 percent, shades-gray
Reaction(pH): extremely acid to moderately acid (3.5 to 6.0)

COMPETING SERIES: There are no series in the same family. Similar soils are the Beauregard (LA), Evadale (TX), Katy (TX), Kirbyville (TX), Splendora (TX), and Texla (TX) series.

Beauregard soils: have less than 35 percent base saturation; have plinthite
Evadale soils: have aquic conditions
Katy soils: have more than 15 percent sand larger than very fine in the particle-size control section; in a hyperthermic soil temperature regime
Kirbyville soils: have less than 35 percent base saturation; have more than 15 percent sand larger than very fine in the particle-size control section
Texla soils: do not have many coarse redox features in the argillic horizon; are in an active CEC to clay class

GEOGRAPHIC SETTING:
Parent material: early Pleistocene age loamy fluviomarine deposits derived from igneous, metamorphic and sedimentary rock
Landscape: coastal plains
Landform: broad interfluves
Slope: 0 to 1 percent
Mean annual precipitation: 1219 to 1473 mm (48 to 58 in)
Precipitation Pattern: Rainfall is generally uniform throughout the year with slight peaks in spring and fall months.
Mean annual air temperature: 19.5 to 20.6 degrees C (67 to 69 degrees F)
Frost-free period: 240 to 300 days
Elevation: 22.9 to 46 m (75 to 150 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Sorter, Splendora, Waller, and the tentative Tarkington and Westcott series.

Sorter and Waller soils: are gray throughout; on a lower landform
Splendora soils: are on a similar landform
Tarkington soils: have less clay in the argillic; are pimple mounds
Wescott soils: have less clay in the argillic; are on a slightly higher landform

DRAINAGE AND PERMEABILITY: somewhat poorly drained. Permeability is slow. Runoff is high. The soil is saturated above argillic horizon for long periods during the months of December to April in normal years and endosaturation from 91 to 203 cm (36 to 80 in) in normal years.

USE AND VEGETATION: Used primarily for timber production and wildlife habitat. The main trees are loblolly pine, shortleaf pine, longleaf pine, water oak, willow oak, southern red oak, and sweetgum. Understory includes yaupon, southern bayberry, pinehill bluestem, longleaf uniola, and sedges.

DISTRIBUTION AND EXTENT: Generally west of the Trinity River in southeast Texas. Land Resource Region- T; Major Land Resource Area- Western Gulf Coast Flatwoods (MLRA 152B) The series is of moderate extent.

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

SERIES PROPOSED: Liberty County, Texas; 2012.

REMARKS: The series was formerly included in the Kirbyville and Splendora series. The series was separated based on the particle-size family.

Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 71 to 121 cm (28 to 78 in). (Bt/E1 and Bt/E2 horizons)

ochric epipedon: 0 to 71 cm (0 to 28 in). (Ap and horizons)
glossic and argillic horizon: 71 to 203 cm (28 to 80 in). (Bt/E1, Bt/E2/Btg/E horizons)

Additional Comments: These soils do not have aquic conditions in the upper part during normal years.

The assignment of the cation-exchange activity class is supported by laboratory data number S12TX2911034 from Liberty County, Texas.

ADDITIONAL DATA: KSSL data from type location S12TX2911034 from Liberty County, Texas.

Taxonomic Version: Keys to Soil Taxonomy, Eleventh Edition, 2010

National Cooperative Soil Survey
U.S.A.