IDENTIFIERS

Current Taxon Name (Soil Name): Houston Black

OSD

Series Extent

User Site ID: S09TX3310009

User Pedon ID: S09TX331009

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - TAMU

Lab Pedon # - S09TX331009

NCSS Pedon Lab Data NASIS Record ID - 45608

Print Date: 11/23/2024

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: 30.9818115

Std. Longitude: -96.9535828

Datum: WGS84

State: Texas

County: TX331—Milam

MLRA: 86A—Texas Blackland Prairie, Northern Part

7.5 Minute USGS Quad: 30096-H8—Ben Arnold, Texas

PEDON

Describers Name: RMR, THW

Current Taxonomic Class: Fine, smectitic, thermic Udic Haplusterts

Current Taxon Kind: series

Pedon Type: TUD pedon

Pedon Purpose: research site

Pedon Record Orgin: PedonPC

Correlated Information:

Soil Name - Houston Black

PSC - 25 to 100 cm.

Classificaton Date - 5/21/2012

Soil Taxonomic Edition - eleventh edition

Moisture Class - ustic

Moisture Subclass - udic

Sampled As Information:

Soil Name - Houston Black

Classificaton Date - 2/4/2009

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

Certification Status: certified

QC Status: level 1

QA Status: level 1

SITE

Parent Material: clayey residuum weathered from mudstone and/or clayey residuum weathered from siltstone

Landscape: dissected plains

Landform: broad plain

Geomorphic Component Hills: base slope

Hill Slope Profile: footslope

Slope Shape Across: linear

Slope Shape Down: concave

Runoff: high

Drainage Class: moderately well

Bedrock: noncoherent moderate weathered mudstone at 154cm with <10

Geology: Knm formation.

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 2/4/2009 (actual site observation date)

Air Photo ID:

Surface Cover Properties:

Site Obs. Cover Kind 1 - crop cover

Site Obs. Cover Kind 2 - close-grown crop

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Yield Study ID -

Pedon Horizon Lab Results - 1
Horizon	Top Depth	Bottom Depth	Sample ID	Data Collector	Total Clay	CaCO3 Clay	Total Silt	Fine Silt	Co. Silt	Total Sand	Total Sand Method	VC Sand	Co. Sand	Med. Sand	Fine Sand	VF Sand	VF Sand Method	Texture Class - Field Lab	Rubbed Fiber	Unrubbed Fiber	pH H2O
	cm	cm			%	%	%	%	%	%		%	%	%	%	%			%	%
Ap Ap Ap Bkss1 Bkss1 Bkss1 Bkss2 Bkss2 Bkss2 Bkss3 Bkss3 Bkss3 Bkss3 BCssy BCssy BCssy BCssy Cdssy Cdssy Cdssy	0 0 0 12 12 12 35 35 35 81 81 81 81 122 122 122 122 154 154 154	— 12 12 — 35 35 — 81 81 — 122 122 122 — 154 154 154 — 222 222	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	0.2 — — 0.2 — — 1.4 — — 0.6 — — — 0.6 — — — 0 — —	0.3 — — 0.4 — — 1.2 — — 0.6 — — — 0.8 — — — 0.1 — —	0.8 — — 1.3 — — 1.3 — — 0.7 — — — 0.4 — — — 0 — —	2.8 — — 4.5 — — 2.8 — — 1.8 — — — 0.5 — — — 0.1 — —	6.2 — — 6.9 — — 4.1 — — 2.8 — — — 0.9 — — — 0.2 — —	300 mesh sieve — — 300 mesh sieve — — 300 mesh sieve — — 300 mesh sieve — — — 300 mesh sieve — — — 300 mesh sieve — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —

Pedon Horizon Lab Results - 2
Horizon	Top Depth	Bottom Depth	Sample ID	pH CaCl2	pH NaF	pH Ox	Delta pH	LL	PL	PI	Atter. Samp. Cond.	COLE	Pot. Acidity	Ca + Mg - Meh 2	K	Ca + Mg - Sat. Paste	KCl Extract. Acidity	Base Sat. - Meh 2	CEC-7	CEC-8.2
	cm	cm						%	%	%		cm/cm	meq/100g	cmol(+)/kg	cmol(+)/kg	mmol(+)/l	cmol(+)/kg	%	cmol(+)/kg	cmol(+)/kg
Ap Ap Ap Bkss1 Bkss1 Bkss1 Bkss2 Bkss2 Bkss2 Bkss3 Bkss3 Bkss3 Bkss3 BCssy BCssy BCssy BCssy Cdssy Cdssy Cdssy	0 0 0 12 12 12 35 35 35 81 81 81 81 122 122 122 122 154 154 154	— 12 12 — 35 35 — 81 81 — 122 122 122 — 154 154 154 — 222 222	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —		— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	37.4 — — 44.5 — — 66.7 — — 182.8 — — — 162.7 — — — 54 — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —

Pedon Horizon Lab Results - 3
Horizon	Top Depth	Bottom Depth	Sample ID	ECEC	Phosphate P	NO3-N	EC	EC Method	EC 1:5 by volume	CaCO3 Equiv.	Equiv. Gypsum	Na	SAR	Gypsum Req.	Humic Color	Fulvic Color	Humic + Fulvic Color	Al	PI	Pyro. Hue	PyrO. Value	Pyro. Chroma
	cm	cm		cmol(+)/kg	mg/kg	mg/kg	dS/m		dS/m	%	%	mmol(+)/l	%	L-pcu/g	L-pcu/g	L-pcu/g	%
Ap Ap Ap Bkss1 Bkss1 Bkss1 Bkss2 Bkss2 Bkss2 Bkss3 Bkss3 Bkss3 Bkss3 BCssy BCssy BCssy BCssy Cdssy Cdssy Cdssy	0 0 0 12 12 12 35 35 35 81 81 81 81 122 122 122 122 154 154 154	— 12 12 — 35 35 — 81 81 — 122 122 122 — 154 154 154 — 222 222	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste	— — — — — — — — — — — — — — — — — — — —	— — 0 — — 1 — — 4 — — — 5 — — — 9 — — 7	— — — — — — — — — — — 11 — — — 14 — — — —	— — — — — — — — — — — — — — — — — — — —	— 1 — — 1 — — 3 — — 6 — — — 9 — — — 14 —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — — — —

Pedon Restrictions
Kind	Hardness	Restriction Depth L-H	Restriction Thickness L-RV-H
		cm
densic material	noncoherent	154 - 222	—

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon slickensides secondary carbonates gypsum accumulations densic materials	0—12 12—222 12—122 122—222 154—222	—- —- —- —- —-

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
1	—	—	120	—		—	—	—	—	—	—	—	—	—	—	—	—	—	—

Ap—0 to 12 centimeters (0.0 to 4.7 inches);, very dark gray (2.5Y 3/1) broken face, moist; silty clay loam; 10 percent sand; 51 percent silt; 39 percent clay; weak medium subangular blocky structure; firm, very sticky, very plastic; 3.0 very fine roots throughout and 2.0 fine roots throughout; 0.2 very fine pores; 1 percent by volume nonflat subrounded 2-4-40 millimeter quartzite fragments; 0.3 cmol/kg of Sodium; 40.2 cmol/kg of CEC; 96 Sum, % of Base Saturation; very slight effervescence, by hcl, 1n; neutral, pH 7.2, pH meter; clear smooth boundary. Lab sample # TAMU7597; observed in trench

Bkss1—12 to 35 centimeters (4.7 to 13.8 inches);, very dark gray (2.5Y 3/1) broken face, moist; silty clay; 13 percent sand; 43 percent silt; 44 percent clay; moderate medium subangular blocky structure; firm, very sticky, very plastic; 2.0 very fine roots throughout and 0.5 fine roots throughout; 0.5 fine pores; 10 percent distinct slickensides (pedogenic); 2 percent medium carbonate concretions; 2 percent by volume nonflat subrounded 3-9-35 millimeter quartzite fragments; 0.3 cmol/kg of Sodium; 42 cmol/kg of CEC; 100 Sum, % of Base Saturation; very slight effervescence, by hcl, 1n; slightly alkaline, pH 7.8, pH meter; clear wavy boundary. Lab sample # TAMU7598; observed in trench

Bkss2—35 to 81 centimeters (13.8 to 31.9 inches);, 70 percent very dark grayish brown (2.5Y 3/2) broken face and 30 percent very dark gray (2.5Y 3/1) broken face, moist; clay; 11 percent sand; 37 percent silt; 53 percent clay; moderate medium angular blocky structure; firm, very sticky, very plastic; 1.0 very fine roots throughout and 0.2 fine roots throughout; 0.5 very fine pores; 25 percent prominent slickensides (pedogenic); 1 percent fine carbonate concretions and 3 percent medium carbonate concretions; 2 percent by volume nonflat subrounded 3-12-37 millimeter quartzite fragments; 1.5 cmol/kg of Sodium; 46.1 cmol/kg of CEC; 100 Sum, % of Base Saturation; slight effervescence, by hcl, 1n; moderately alkaline, pH 8.0, pH meter; gradual wavy boundary. Lab sample # TAMU7599; observed in trench

Bkss3—81 to 122 centimeters (31.9 to 48.0 inches);, 75 percent very dark grayish brown (2.5Y 3/2) broken face and 20 percent very dark gray (2.5Y 3/1) broken face and 5 percent yellowish brown (10YR 5/6) broken face, moist; clay; 7 percent sand; 39 percent silt; 55 percent clay; moderate medium angular blocky parts to weak medium wedge structure; firm, very sticky, very plastic; 0.5 very fine roots throughout; 0.5 very fine pores; 35 percent prominent slickensides (pedogenic); 1 percent coarse prominent irregular carbonate masses and 1 percent medium carbonate concretions; 1 percent by volume nonflat subrounded 4-5-6 millimeter quartzite fragments; 4.3 cmol/kg of Sodium; 40.7 cmol/kg of CEC; 100 Sum, % of Base Saturation; slight effervescence, by hcl, 1n; slightly alkaline, pH 7.7, pH meter; clear wavy boundary. Lab sample # TAMU7600; observed in trench

BCssy—122 to 154 centimeters (48.0 to 60.6 inches);, 60 percent light olive brown (2.5Y 5/3) broken face and 30 percent yellowish brown (10YR 5/6) broken face and 5 percent very dark gray (2.5Y 3/1) broken face and 5 percent gray (2.5Y 5/1) broken face, moist; silty clay; 3 percent sand; 42 percent silt; 55 percent clay; weak medium subangular blocky structure; firm, very sticky, very plastic; 0.2 very fine roots throughout; 0.5 very fine pores; 20 percent prominent slickensides (pedogenic); 2 percent fine gypsum crystals, unspecified; 15 percent by volume nonflat subangular ? to 5-? millimeter mudstone fragments; 6.1 cmol/kg of Sodium; 30.9 cmol/kg of CEC; 100 Sum, % of Base Saturation; slight effervescence, by hcl, 1n; slightly alkaline, pH 7.7, pH meter; gradual wavy boundary. Lab sample # TAMU7601; observed in trench

Cdssy—154 to 222 centimeters (60.6 to 87.4 inches);, 70 percent light olive brown (2.5Y 5/4) broken face and 20 percent yellowish brown (10YR 5/6) broken face and 10 percent gray (2.5Y 5/1) broken face, moist; clay; 0 percent sand; 34 percent silt; 66 percent clay; structureless massive; firm, very sticky, very plastic; 10 percent distinct slickensides (pedogenic); 4 percent fine platy gypsum crystals, unspecified; fragments; 10 cmol/kg of Sodium; 39.9 cmol/kg of CEC; 100 Sum, % of Base Saturation; slight effervescence, by hcl, 1n; moderately alkaline, pH 7.9, pH meter. Lab sample # TAMU7602; observed in trench