D04 LAJA Megapit Soils Description

 

PEDON DESCRIPTION
Print Date: Apr 8 2015 Country: United States
Description Date: Apr 8 2014 State: Puerto Rico
Describer: Matos, Manuel County: Lajas
Site ID: S2014PR079001 MLRA: 271 -- Semiarid Mountains and Valleys
Site Note: Pedon description to support the Caribbean Basin NEON Project under the National Science Foundation. Local contact is Yamil Toro from San Juan, PR and science protocol contact is Rommel Zulueta from Colorado, USA. Soil Survey Area: PR787 -- San German Area, Southwestern Puerto Rico
Pedon ID: S2014PR079001 Map Unit:
Pedon Note: Quad Name: San German, Puerto Rico
Lab Source ID: KSSL Std Latitude: 18.0218444
Lab Pedon #: 14N0430 Std Longitude: -67.0760833
User Transect ID:  
Soil Name as Described/Sampled:  
Classification: Latitude: 18 degrees 1 minutes 18.64 seconds north
Soil Name as Correlated: Cartagena Longitude: 67 degrees 4 minutes 33.90 seconds west
Classification: Fine, mixed, superactive, isohyperthermic Sodic Haplusterts Datum: WGS84
Pedon Type: undefined observation UTM Zone: 19
Pedon Purpose: research site UTM Easting: 703677 meters
Taxon Kind: series UTM Northing: 1993661 meters
Associated Soils: Aguirre, Fraternidad, Guanica, Jacana, Santa Isabel
Physiographic Division: Caribbean Basin Primary Earth Cover: Grass/herbaceous cover
Physiographic Province: Caribbean Islands Province Secondary Earth Cover: Tame pastureland
Physiographic Section: Greater Antilles (Puerto Rico) Existing Vegetation:
State Physiographic Area: Parent Material: clayey marine deposits over alluvium derived from volcanic rock
Local Physiographic Area: Lajas Valley Bedrock Kind:
Geomorphic Setting: on talf None Assigned Bedrock Depth:
Upslope Shape: linear Bedrock Hardness:
Cross Slope Shape: linear Bedrock Fracture Interval:
Particle Size Control Section: 25 to 100 cm. Surface Fragments:
Description origin: NASIS Description database: KSSL
Diagnostic Features: mollic epipedon 0 to 83 cm.
slickensides 27 to 107 cm.
gypsum accumulations 55 to 145 cm.
salt accumulations 55 to 107 cm.
redox concentrations 83 to 203 cm.
abrupt textural change 107 to 164 cm.
redox depletions with chroma 2 or less 145 to 203 cm.
strongly contrasting particle size class 164 to 176 cm.
abrupt textural change 164 to 176 cm.
abrupt textural change 176 to 203 cm.

 

 

 

Cont. Site ID: S2014PR079001 Pedon ID: S2014PR079001
 

 

Slope (%) Elevation (meters) Aspect (deg) MAAT (C) MSAT (C) MWAT (C) MAP (mm) Frost-Free Days Drainage Class Slope Length (meters) Upslope Length (meters)
1.0 40.0 225 25.0     100   moderately well    

Ap--0 to 27 centimeters (0.0 to 10.6 inches); clay, black (10YR 2/1) broken face, moist; strong fine subangular blocky parts to strong medium granular, and strong fine subangular blocky parts to strong coarse granular structure; very hard, extremely firm, very sticky, very plastic; high toughness; high penetration resistance; high excavation difficulty; common very fine roots throughout and common fine roots throughout; many medium moderate-continuity interstitial and many fine moderate-continuity interstitial pores; 2 percent distinct pressure faces on vertical faces of peds; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; clear wavy boundary. Lab sample # 14N02432

ABss--27 to 55 centimeters (10.6 to 21.7 inches); clay, black (10YR 2/1), moist; weak medium subangular blocky structure; very hard, extremely firm, very sticky, very plastic; high toughness; high penetration resistance; high excavation difficulty; common very fine roots throughout and common fine roots throughout; common very fine moderate-continuity tubular and common very fine moderate-continuity irregular and common fine moderate-continuity vesicular pores; 20 percent prominent slickensides (pedogenic) on all faces of peds; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; clear smooth boundary. Lab sample # 14N02433

Bssyz--55 to 83 centimeters (21.7 to 32.7 inches); clay, 75 percent very dark brown (10YR 2/2) and 25 percent very dark grayish brown (10YR 3/2), moist; weak medium subangular blocky structure; very hard, extremely firm, very sticky, very plastic; high toughness; high penetration resistance; high excavation difficulty; common fine roots throughout; common very fine moderate-continuity tubular and common very fine moderate-continuity vesicular and common very fine moderate-continuity vesicular pores; 20 percent prominent slickensides (pedogenic) on all faces of peds; 1 percent fine prominent gypsum crystal clusters and 1 percent fine prominent 10YR 8/1), moist, gypsum masses and 1 percent fine prominent gypsum crystal clusters; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; clear smooth boundary. Lab sample # 14N02434

Bkssyz--83 to 107 centimeters (32.7 to 42.1 inches); clay, 90 percent dark yellowish brown (10YR 4/4) and 10 percent very dark grayish brown (10YR 3/2), moist; weak medium subangular blocky structure; slightly hard, firm, very sticky, very plastic; high toughness; high penetration resistance; high excavation difficulty; common fine roots throughout; common very fine moderate-continuity tubular and common very fine moderate-continuity irregular pores; 5 percent prominent slickensides (pedogenic) on all faces of peds; 1 percent fine distinct spherical manganese masses with sharp boundaries throughout and 1 percent medium distinct spherical manganese masses throughout and 2 percent medium prominent 7.5YR 5/8), moist, masses of oxidized iron with clear boundaries on faces of peds and 5 percent fine prominent 7.5YR 5/8), moist, masses of oxidized iron with clear boundaries on faces of peds; 5 percent fine prominent gypsum crystal clusters and 5 percent fine prominent 10YR 8/1), moist, gypsum masses and 5 percent fine prominent gypsum crystal clusters; slight effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; clear smooth boundary. Lab sample # 14N02435

2Bky--107 to 145 centimeters (42.1 to 57.1 inches); sandy clay, brown (10YR 4/3), moist; weak medium subangular blocky structure; slightly hard, firm, slightly sticky, moderately plastic; medium toughness; moderate penetration resistance; high excavation difficulty; common fine roots throughout; common very fine moderate-continuity tubular and common very fine moderate-continuity irregular pores; 5 percent medium prominent 7.5YR 5/8), moist, masses of oxidized iron with clear boundaries on faces of peds and 10 percent fine prominent 7.5YR 5/8), moist, masses of oxidized iron with clear boundaries on faces of peds and 10 percent fine distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout and 10 percent medium distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout; 1 percent fine prominent gypsum crystal clusters and 1 percent fine prominent 10YR 8/1), moist, gypsum masses and 1 percent fine prominent gypsum crystal clusters; slight effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; clear smooth boundary. Lab sample # 14N02436

2C--145 to 164 centimeters (57.1 to 64.6 inches); sandy clay loam, brown (10YR 4/3), moist; massive; slightly hard, very friable, slightly sticky, moderately plastic; low toughness; moderate penetration resistance; moderate excavation difficulty; common fine roots throughout; common very fine moderate-continuity tubular and common very fine moderate-continuity irregular pores; 1 percent medium prominent 10Y 4/1), moist, iron depletions with clear boundaries on faces of peds and 5 percent medium prominent 7.5YR 4/6), moist, iron-manganese masses with clear boundaries on faces of peds and 5 percent coarse distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout and 5 percent medium distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout; 1 percent subrounded 2 to 25-millimeter volcanic rock fragments; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; abrupt smooth boundary. Lab sample # 14N02437

3C--164 to 176 centimeters (64.6 to 69.3 inches); sandy loam, brown (10YR 4/3), moist; massive; loose, very friable, nonsticky, nonplastic; low toughness; low penetration resistance; low excavation difficulty; common fine roots throughout; common very fine moderate-continuity irregular pores; 1 percent medium prominent 10Y 4/1), moist, iron depletions with clear boundaries on faces of peds and 1 percent fine distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout and 1 percent fine distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout and 5 percent medium prominent 7.5YR 4/6), moist, iron-manganese masses with clear boundaries on faces of peds; 10 percent subrounded 2 to 25-millimeter volcanic rock fragments; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions; abrupt smooth boundary. Lab sample # 14N02438

4C--176 to 203 centimeters (69.3 to 79.9 inches); silty clay, brown (10YR 4/3), moist; massive; hard, firm, very sticky, very plastic; high toughness; high penetration resistance; high excavation difficulty; common fine roots throughout; common very fine moderate-continuity tubular and common very fine moderate-continuity irregular pores; 20 percent prominent slickensides (geogenic) on all faces of peds; 1 percent fine distinct spherical 10YR 2/1), moist, manganese masses with sharp boundaries throughout and 5 percent medium prominent 10Y 5/1), moist, iron depletions with clear boundaries on faces of peds and 25 percent medium prominent 7.5YR 5/8), moist, iron-manganese masses with clear boundaries on faces of peds; 10 percent subrounded 2 to 25-millimeter volcanic rock fragments; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.0, pH indicator solutions. Lab sample # 14N02439

 

 


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