IDENTIFIERS

Current Taxon Name (Soil Name): Llanos Costa

OSD

Series Extent

User Site ID: D99PR023016

User Pedon ID: D99PR023016

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - NSSL

Lab Pedon # - 86P0222

NCSS Pedon Lab Data NASIS Record ID - 58027

Print Date: 2/17/2025

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: 18.1294444

Std. Longitude: -67.1202778

Datum: WGS84

Location Description: Llanos Costa loam, 5 to 12 percent slopes; approximately 3.3 miles west from the intersection of P.R. Hwy. 303 and P.R. Hwy. 305; about 1.4 miles west of Maguayo community on dirt road; about 80 feet south of dirt road on native pasture; Cabo Rojo Municipality. (USGS San German topographic quadrangle (1966); lat. 18 degrees 07 minutes 46 seconds N., and long. 67 degrees 07 minutes 13 seconds W.)

Map Unit: AmC2—Amelia-Maguayo gravelly clay loams, 5 to 12 percent slopes, erod edLnC—Llanos Costa loam, 5 to 12 percent slopes

Non-MLRA Soil Survey Area: PR687—Lajas Valley Area, Puerto RicoPR787—San German Area, Southwestern Puerto Rico

PEDON

Describers Name: D. Williams; Louis A. Daniels; Gilberto Acevedo; Joaquin Torres-Mas

Current Taxonomic Class: Fine, mixed, semiactive, isohyperthermic Typic Haplargids

Current Taxon Kind: series

Pedon Type: OSD pedon

Pedon Purpose: full pedon description

Pedon Record Orgin: NASIS

Pedon #: 16

Correlated Information:

Soil Name - Llanos Costa

PSC - 22 to 72 cm.

Classificaton Date - 2/27/2009

Soil Taxonomic Edition - tenth edition

Moisture Class - aridic (torric)

Moisture Subclass - aridic (torric)

Sampled As Information:

Soil Name - Amelia

Classificaton Date - 5/20/1985

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Parent Material: gravelly sediments that weathered from basalt, chert and rhyolite

Landscape: upland

Landform: mountain slope, alluvial fan

Geomorphic Component Mountains: mountainbase

Hill Slope Profile: footslope

Slope Position: lower third

Slope Complexity: simple

Slope Shape Across: convex

Slope Shape Down: linear

Drainage Pattern: parallel

Runoff: medium

Drainage Class: well

Flooding: none flooding

Ponding: none ponding

Geology: Holcene And Pleistocene (quaternary) member of the Alluvium formation in the Qal group.

Surface Fragments: 3.00 percent 2- to 75-millimeter igneous, unspecified,

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 5/20/1985 (actual site observation date)

Air Photo ID: 6C

Surface Water Kind: none observed

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

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon argillic horizon	0—22 22—198	13—22—28 152—198—203

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
7	—	—	20	—	170	668	—	365	26.5	28.1	24.6	28	29.4	26	—	—	2066	Combate Station	NRCS-NWCC SCAN

Ap—0 to 22 centimeters (0.0 to 8.7 inches); brown (7.5YR 4/4) broken face, dark brown (7.5YR 3/4) broken face, moist; loam; 47 percent sand; 30 percent silt; 23 percent clay; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; moderate permeability; 3.0 very fine roots throughout; 3 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; moderately acid, pH 5.6, pH meter; clear wavy boundary. Lab sample # 86P01318; moist when described; observed in pit, large or quarry

Bt1—22 to 39 centimeters (8.7 to 15.4 inches); reddish brown (5YR 4/4) broken face, dark reddish brown (5YR 3/4) broken face, moist; gravelly clay loam; 39 percent sand; 27 percent silt; 34 percent clay; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderate permeability; 3.0 very fine roots throughout; 25 percent faint clay films on bottom faces of peds; 33 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; slightly acid, pH 6.3, pH meter; clear smooth boundary. Lab sample # 86P01319; moist when described; observed in pit, large or quarry

Bt2—39 to 73 centimeters (15.4 to 28.7 inches); yellowish red (5YR 4/6) broken face, yellowish red (5YR 4/6) broken face, moist; gravelly clay; 27 percent sand; 19 percent silt; 53 percent clay; moderate medium subangular blocky, and moderate fine subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderate permeability; 0.5 very fine roots throughout; 50 percent distinct clay films on bottom faces of peds; 19 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; neutral, pH 6.6, pH meter; gradual smooth boundary. Lab sample # 86P01320; moist when described; observed in pit, large or quarry

Bt3—73 to 110 centimeters (28.7 to 43.3 inches); yellowish red (5YR 4/6) broken face, yellowish red (5YR 4/6) broken face, moist; very gravelly clay; 41 percent sand; 14 percent silt; 45 percent clay; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderate permeability; 0.5 very fine roots throughout; 50 percent distinct clay films on bottom faces of peds; 45 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; slightly acid, pH 6.2, pH meter; clear wavy boundary. Lab sample # 86P01321; moist when described; observed in pit, large or quarry

Bt4—110 to 142 centimeters (43.3 to 55.9 inches); 25 percent yellowish red (5YR 4/6) broken face and 75 percent strong brown (7.5YR 5/6) broken face, 25 percent yellowish red (5YR 4/6) broken face and 75 percent strong brown (7.5YR 4/6) broken face, moist; very gravelly sandy clay loam; 58 percent sand; 13 percent silt; 29 percent clay; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderate permeability; 0.5 very fine roots throughout; 50 percent distinct clay films on bottom faces of peds; 38 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; moderately acid, pH 5.8, pH meter; gradual wavy boundary. Lab sample # 86P01322; moist when described; observed in pit, large or quarry

Bt5—142 to 172 centimeters (55.9 to 67.7 inches); yellowish red (5YR 5/6) broken face, yellowish red (5YR 4/6) broken face, moist; very gravelly sandy clay loam; 56 percent sand; 12 percent silt; 32 percent clay; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderate permeability; 25 percent distinct clay films on bottom faces of peds; 46 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; moderately acid, pH 5.9, pH meter; gradual wavy boundary. Lab sample # 86P01323; moist when described; observed in pit, large or quarry

Bt6—172 to 198 centimeters (67.7 to 78.0 inches); yellowish red (5YR 5/6) broken face, yellowish red (5YR 4/6) broken face, moist; gravelly sandy clay loam; 57 percent sand; 12 percent silt; 31 percent clay; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderate permeability; 25 percent distinct clay films on bottom faces of peds; 34 percent by volume 5-20-75 millimeter igneous, unspecified fragments; noneffervescent, by hcl, 1n; moderately acid, pH 5.9, pH meter. Lab sample # 86P01324; moist when described; observed in pit, large or quarry