IDENTIFIERS

Current Taxon Name (Soil Name): Harqua

OSD

Series Extent

User Site ID: S1971AZ019007

User Pedon ID: S1971AZ019007

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - SSL

Lab Pedon # - 71C0007

NCSS Pedon Lab Data NASIS Record ID - 13227

Print Date: 4/24/2025

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: 31.8627777

Std. Longitude: -112.7438889

Datum: WGS84

Township: 18S

Range: 5W

Section: 14

PLSS Details: Northwest of Blackenship well, north on highest ridge, 1/4 mile south and 200 feet west of northeast corner

Location Description: Organ Pipe Cactus National Monument.

State: Arizona

County: AZ019—Pima

Non-MLRA Soil Survey Area: AZ648—Cabeza Prieta Area, Arizona, Parts of Pima and Yuma Counties

PEDON

Describers Name: Y. H. Havens, E. Chamberlin

Pedon Type: taxadjunct to the series

Pedon Purpose: full pedon description

Pedon Record Orgin: Converted from PDP 3.x

Pedon #: 7

Sampled As Information:

Soil Name - Harqua

Taxonomic Class - Fine-loamy, mixed Typic Natrargids

PSC - 7 to 57 cm.

Classificaton Date - 4/7/1971

Moisture Class - aridic (torric)

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Slope Shape Down: convex

Drainage Class: well

Surface Fragments: 80.00 percent

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 4/7/1971 (actual site observation date)

Surface Cover Properties:

Site Obs. Cover Kind 1 - grass/herbaceous cover

Site Obs. Cover Kind 2 - rangeland, grassland

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

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
3	—	—	442	—		229	—	—	20.6	—	—	—	—	—	—	—	—	—	—

A2—0 to 7 centimeters (0.0 to 2.8 inches); light brown (7.5YR 6/4), brown (7.5YR 4/4), moist; very gravelly loam; weak medium and coarse platy structure; slightly hard, very friable, nonsticky, slightly plastic; 0.5 very fine roots; 21.0 very fine vesicular and tubular pores; 50 percent by volume 2-39-75 millimeter unspecified fragments; slight effervescence; strongly alkaline, pH 8.6, thymol-blue; abrupt wavy boundary. Lab sample # 71C00041; dry when described;

B1sa—7 to 15 centimeters (2.8 to 5.9 inches); yellowish red (5YR 5/6), yellowish red (5YR 4/6), moist; loam; weak fine subangular blocky structure; soft, very friable, moderately sticky, slightly plastic; 3.0 very fine and fine roots; 3.0 very fine interstitial pores; salt masses and 1 percent fine noncoherent cemented pinkish white (7.5YR 8/2) lime masses; 1 percent by volume 2-?-5 millimeter unspecified fragments; slight effervescence; strongly alkaline, pH 8.5, thymol-blue; clear wavy boundary. Lab sample # 71C00042; dry when described;

B21TCAsa—15 to 30 centimeters (5.9 to 11.8 inches); yellowish red (5YR 5/6), yellowish red (5YR 4/6), moist; gravelly clay loam; weak medium prismatic parts to moderate fine and medium subangular blocky structure; hard when dry, friable, moderately sticky, moderately plastic; 0.5 very fine roots; 0.5 fine and medium tubular pores; pink (7.5YR 7/4), moist,; 3 percent fine extremely weakly coherent cemented pinkish white (7.5YR 8/2) lime masses; 35 percent by volume 2-?-250 millimeter unspecified fragments; strong effervescence; strongly alkaline, pH 8.7, thymol-blue; abrupt wavy boundary. Lab sample # 71C00043; dry when described;

B22TCAsa—30 to 46 centimeters (11.8 to 18.1 inches); reddish brown (5YR 5/4), yellowish red (5YR 4/6), moist; gravelly sandy clay loam; weak medium prismatic parts to moderate fine and medium subangular blocky structure; hard when dry, friable, moderately sticky, moderately plastic; 0.5 very fine roots; 0.5 fine tubular pores; pink (7.5YR 7/4), moist, carbonate coats on rock fragments and 10 percent clay films on faces of peds and in pores; 21 percent fine extremely weakly coherent cemented pinkish white (7.5YR 8/2) lime masses and 3 percent medium and coarse salt masses; 35 percent by volume 2-39-75 millimeter unspecified fragments; violent effervescence; strongly alkaline, pH 8.7, thymol-blue; clear wavy boundary. Lab sample # 71C00044; dry when described;

B3TCAsa—46 to 69 centimeters (18.1 to 27.2 inches); light brown (7.5YR 6/4), brown (7.5YR 5/4), moist; gravelly clay loam; weak fine and medium subangular blocky structure; hard when dry, friable, moderately sticky, moderately plastic; 0.5 very fine roots; 0.5 fine tubular pores; pink (7.5YR 7/4), moist, carbonate coats on rock fragments and 10 percent clay films on faces of peds and in pores; 21 percent fine extremely weakly coherent cemented pinkish white (7.5YR 8/2) lime masses and 3 percent medium and coarse salt masses; 25 percent by volume 2-39-75 millimeter unspecified fragments; violent effervescence; strongly alkaline, pH 9.0, thymol-blue; clear wavy boundary. Lab sample # 71C00045; dry when described;

2C1CAsa—69 to 84 centimeters (27.2 to 33.1 inches); light brown (7.5YR 6/4), brown (7.5YR 5/4), moist; clay loam; massive; hard when dry, friable, moderately sticky, moderately plastic; 0.5 fine tubular pores; pink (7.5YR 7/4), moist,; 3 percent fine and medium extremely weakly coherent cemented pinkish white (7.5YR 8/2) lime masses; 1 percent by volume 2-?-5 millimeter unspecified fragments; violent effervescence; strongly alkaline, pH 9.0, thymol-blue; clear wavy boundary. Lab sample # 71C00046; dry when described;

2C2CAsa—84 to 104 centimeters (33.1 to 40.9 inches); light brown (7.5YR 6/4), brown (7.5YR 5/4), moist; loam; massive; hard when dry, friable, slightly sticky, moderately plastic; 0.5 fine tubular pores; 1 percent by volume 2-?-5 millimeter unspecified fragments; strongly alkaline, pH 9.0, thymol-blue. Lab sample # 71C00047; dry when described;