IDENTIFIERS

Current Taxon Name (Soil Name): RACOMBES

OSD

Series Extent

User Site ID: S1997TX489002

User Pedon ID: 97TX489002

Vegetation Plot ID: S1997TX489002

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - SSL

Lab Pedon # - 98P0179

NCSS Pedon Lab Data NASIS Record ID - 10450

Print Date: 11/21/2024

LOCATION

Location In Web Soil Survey

AOI is roughly a square mile and pedon is marked in the center.

Location in SoilWeb

Location in Google Maps

Std. Latitude: 26.4004726

Std. Longitude: -97.7143326

Datum: WGS84

Location Description: From the junction of the US 77 and FR 498, go 4.3 miles east on FR 498 then 240 feet south into cropland.

State: Texas

County: TX489—Willacy

MLRA: 83D—Lower Rio Grande Plain

Non-MLRA Soil Survey Area: TX489—Willacy County, Texas

7.5 Minute USGS Quad: 26097-D6—San Perlita South, Texas

PEDON

Describers Name: R. Molina, P. Holland, M. Golden, D. Brezina, S. Dunn, A. Stahnke

Current Taxonomic Class: Fine-loamy, mixed, hyperthermic Pachic Argiustolls

Current Taxon Kind: series

Pedon Type: classifies to current taxon name, full description

Pedon Purpose: research site

Pedon Record Orgin: Converted from PDP 3.x

Pedon #: 2

Sampled As Information:

Soil Name - RACOMBES

Taxonomic Class - Fine-loamy, mixed, hyperthermic Pachic Argiustolls

PSC - 30 to 80 cm.

Classificaton Date - 12/2/1997

Moisture Class - ustic

Dynamic Soil Properties:

Erosion Class - 1

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Landscape: coastal plain

Landform: coastal plain

Anthropogenic Feature: leveled land

Geomorphic Component Hills: side slope

Hill Slope Profile: footslope

Slope Shape Across: linear

Slope Shape Down: linear

Runoff: very low

Drainage Class: well

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 12/2/1997 (actual site observation date)

Air Photo ID: A.S. 24

Surface Cover Properties:

Site Obs. Cover Kind 1 - crop cover

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Site Erosion Accelerated: wind and water erosion

Vegetation Plot Plants
Plant Symbol	Scientific Name	National Vernacular Name	Plant Type Group	Canopy Cover %	Vegetation Stata Level
SOBIB SOBIB	Sorghum bicolor ssp. bicolor Sorghum bicolor ssp. bicolor	grain sorghum grain sorghum	— —	— —	— —

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
mollic epipedon argillic horizon calcic horizon	0—76 30—111 111—185	—- —- —-

Setting and Climate
Slope	Slope Length USLE	Upslope Length	Elev.	Corr. Elev	Aspect	MAP	REAP	FFD	MAAT	MSAT	MWAT	MAST	MSST	MWST	MFFP	PE Index	Climate Station ID	Climate Station Name	Climate Station Type
%	m				degrees	mm	mm		C						mm
0	375	225	9	—	45	700	—	—	23	26	16	—	—	—	—	—	—	—	—

Ap—0 to 30 centimeters (0.0 to 11.8 inches);, very dark gray (7.5YR 3/1), moist; fine sandy loam; moderate fine and medium subangular blocky parts to moderate fine and medium granular structure; very friable; 3.0 very fine roots throughout and 3.0 medium roots throughout; 3.0 very fine pores; fragments; noneffervescent; moderately alkaline, pH 8.2, hellige-truog; abrupt smooth boundary. Lab sample # 98P01130. 10% by volume 10YR 5/3 sand lenses from the surface due to plowing.

Bt1—30 to 41 centimeters (11.8 to 16.1 inches);, dark brown (7.5YR 3/2), moist; sandy clay loam; moderate medium subangular blocky structure; very friable; 3.0 very fine and fine roots throughout and 3.0 medium roots throughout; 21.0 very fine and fine and 3.0 medium and 3.0 coarse pores; 10 percent faint dark brown (7.5YR 3/2) clay films on faces of peds; 3 percent fine cylindrical worm casts throughout; fragments; noneffervescent; moderately alkaline, pH 8.2, hellige-truog; clear smooth boundary. Lab sample # 98P01131. Few, dine, distinct, 75YR 5/4, soft masses from lower horizons due to bioturbation.; discontinuous - phpvsfiid 201705; discontinuous - phpvsfiid 201705

Bt2—41 to 76 centimeters (16.1 to 29.9 inches);, dark brown (7.5YR 3/2), moist; sandy clay loam; moderate coarse prismatic parts to moderate coarse angular blocky structure; friable; 3.0 very fine and fine roots throughout and 3.0 medium roots throughout; 21.0 very fine and fine and 21.0 medium and 3.0 coarse pores; 1 percent faint black (10YR 2/1) organic stains throughout and 10 percent faint dark brown (7.5YR 3/2) clay films on faces of peds; 3 percent fine and medium cylindrical worm casts throughout; fragments; noneffervescent; slightly alkaline, pH 7.6, hellige-truog; gradual smooth boundary. Lab sample # 98P01132. Few, fine, distinct, 7.5YR 5/4 soft masses from lower horizons due to bioturbation.; discontinuous - phpvsfiid 201706; discontinuous - phpvsfiid 201707; discontinuous - phpvsfiid 201706; discontinuous - phpvsfiid 201707

Bt3—76 to 99 centimeters (29.9 to 39.0 inches);, brown (7.5YR 4/3), moist; sandy clay loam; 3 percent strong brown (7.5YR 4/6) fine faint threadlike mottles; moderate coarse prismatic parts to moderate medium and coarse angular blocky structure; friable; 3.0 very fine and fine roots throughout and 3.0 medium roots throughout; 21.0 very fine and fine and 3.0 medium and 3.0 coarse pores; 10 percent faint brown (7.5YR 4/3) clay films on faces of peds; 3 percent fine spherical very dark gray (7.5YR 3/1) iron-manganese masses throughout; 3 percent coarse cylindrical worm casts throughout and 3 percent fine and medium cylindrical worm casts throughout; fragments; noneffervescent; slightly alkaline, pH 7.6, hellige-truog; abrupt smooth boundary. Lab sample # 98P01133. continuous - phpvsfiid 201411; continuous - phpvsfiid 201411

Btk—99 to 111 centimeters (39.0 to 43.7 inches);, brown (7.5YR 4/4), moist; sandy clay loam; 1 percent strong brown (7.5YR 4/6) fine faint threadlike mottles; moderate coarse prismatic parts to moderate medium subangular blocky structure; friable; 3.0 very fine and fine roots throughout; 21.0 very fine and fine and 21.0 medium and 3.0 coarse pores; 10 percent faint brown (7.5YR 4/3) clay films on faces of peds; 1 percent fine spherical very dark gray (7.5YR 3/1) iron-manganese masses throughout; 1 percent coarse cylindrical worm casts throughout and 3 percent fine threadlike carbonate threads throughout and 3 percent fine and medium spherical carbonate concretions throughout and 3 percent fine and medium cylindrical worm casts throughout; fragments; violent effervescence; moderately alkaline, pH 8.2, hellige-truog; clear smooth boundary. Lab sample # 98P01134. continuous - phpvsfiid 201412; continuous - phpvsfiid 201412

Bk1—111 to 147 centimeters (43.7 to 57.9 inches);, brown (7.5YR 5/4), moist; sandy clay loam; weak coarse prismatic parts to moderate medium subangular blocky structure; friable; 3.0 very fine and fine roots throughout; 21.0 very fine and fine and 21.0 medium and 3.0 coarse pores; 10 percent faint brown (7.5YR 4/4) clay films on faces of peds; 3 percent fine and medium irregular carbonate masses throughout and 3 percent medium cylindrical worm casts throughout; fragments; violent effervescence; moderately alkaline, pH 8.2, hellige-truog; gradual smooth boundary. Lab sample # 98P01135. discontinuous - phpvsfiid 201413; discontinuous - phpvsfiid 201413

Bk2—147 to 185 centimeters (57.9 to 72.8 inches);, brown (7.5YR 5/4), moist; sandy clay loam; moderate coarse prismatic parts to moderate medium subangular blocky structure; friable; 3.0 very fine and fine roots throughout; 21.0 very fine and fine and 21.0 medium and 3.0 coarse pores; 10 percent faint brown (7.5YR 4/4) clay films on faces of peds; 3 percent fine and medium spherical carbonate concretions throughout and 3 percent medium cylindrical worm casts throughout; fragments; violent effervescence; moderately alkaline, pH 8.2, hellige-truog; gradual smooth boundary. Lab sample # 98P01136. discontinuous - phpvsfiid 201414; discontinuous - phpvsfiid 201414

Bk3—185 to 200 centimeters (72.8 to 78.7 inches);, brown (7.5YR 5/4), moist; sandy clay loam; weak coarse prismatic parts to moderate medium subangular blocky structure; friable; 3.0 very fine roots between peds; 21.0 very fine and fine and 21.0 medium and 3.0 coarse pores; 1 percent faint brown (7.5YR 4/4) clay films on faces of peds; 3 percent fine and medium threadlike carbonate masses and 1 percent fine and medium spherical moderately coherent cemented carbonate concretions and 1 percent medium cylindrical dark gray (7.5YR 4/1) worm casts throughout; fragments; violent effervescence; moderately alkaline, pH 8.2, hellige-truog. Lab sample # 98P01137. discontinuous - phpvsfiid 201415; discontinuous - phpvsfiid 201415