LOCATION IGUALDAD PREstablished Series
TAXONOMIC CLASS: Clayey over sandy or sandy-skeletal, mixed, superactive, nonacid, isohyperthermic Typic Endoaquepts
TYPICAL PEDON: Igualdad Clay - sugar cane
(Colors are for moist soil)
Ap--0 to 4 inches; very dark grayish brown (10YR 3/2) clay; moderate fine granular structure; hard, firm, sticky, plastic; common fine black concretions; many fine roots; strongly acid; clear, smooth boundary. (4 to 8 inches thick)
B2--4 to 10 inches; very dark gray (10YR 3/1) clay with common medium distinct reddish brown (5YR 4/3) and gray (5Y 6/1) mottles; weak fine subangular blocky structure with pressure faces; firm, sticky, plastic; common fine black concretions; common fine roots; medium acid; clear smooth boundary. (4 to 8 inches thick)
B3--10 to 24 inches; dark gray (N 4/0) clay; with dark brown (10YR 4/3) coatings on ped faces and root channels; massive with pressure faces; firm, sticky, plastic; few fine roots; gradual smooth boundary. (12 to 16 inches thick)
IIC2g--24 to 30 inches; dark greenish gray (5C 4/1) sandy clay with common fine distinct brown (7/5YR 4/4) mottles; massive; firm, sticky, plastic; mildly alkaline; clear smooth boundary. (4 to 8 inches thick)
IIIC3g--30 to 36 inches plus; dark greenish gray (5G 4/1) sand with many calcareous shell fragments.
TYPE LOCATION: Oeste SCD, Puerto Rico; 2 miles west of the town of Anasco; 50 meters west of kilometer marker 2.2 of highway 115.
RANGE IN CHARACTERISTICS: Thickness of solum ranges from 20 to 32 inches. Depth to calcareous sand ranges from 24 to 40 inches. Depth to water table varies from 4 to 30 inches.
Color of the A horizons ranges in hues of 2.5Y and 10YR, values of 3, and chromas of 1 to 3.
Colors of the B and C horizons have dominantly low chromas. Texture of the solum and the upper C horizons is clay. The lower C2g horizons vary in texture from sandy clay to sandy clay loam. Organic matter content does not decrease regularly with depth.
COMPETING SERIES: These are the
Vayas and
Fortuna series in the same Subgroup and the
Perchas,
Maunabo,
Bajura,
Santoni, Josefa,
Talante,
Coloso,
Corcega, and
Pinones series in the same Great Group. The Vayas and Fortuna soils lack sandy horizons in their lower profiles. The Perchas and Maunabo soils have organic matter content that decreases regularly with depth and lack sandy lower horizons. The Bajura and Santoni soils have clays with high shrink-swell behavior and common to many pressure faces. The Josefa, Talante, and Corcega soils have coarser textured profiles and brighter colors in their upper profiles. The Coloso soils are better drained and have brighter colors in their upper profiles. The Pinones soils are underlaid by organic layers within their control sections.
GEOGRAPHIC SETTING: The Igualdad series occurs on nearly level river flood plains with slope gradients from 0 to 2 percent. The regolith consists of fine textured sediments over sands. The climate is humid tropical. The average annual precipitation is 84 inches and the mean annual temperature is 78 degrees F. The mean annual soil temperature at 20 inches deep is over 71.6 degrees F with less than 9 degrees F difference between mean summer and winter temperatures.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Bajura, Aguada and Coloso series in addition to the Toa series. The Toa soils are better drained and occur at slightly higher positions in the river flood plain.
DRAINAGE AND PERMEABILITY: Poorly drained, slow runoff and permeability. If not drained, soils are saturated with water during wet seasons.
USE AND VEGETATION: Most of the acreage is planted to sugar cane, small undrained areas are in native pasture.
DISTRIBUTION AND EXTENT: Humid river flood plains of Puerto Rico. The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Raleigh, North Carolina
SERIES ESTABLISHED: Oeste SCD, Puerto Rico. Igualdad is the name of a sugar mill near the place where this series was first recognized.
REMARKS: This soil was formerly mapped as a poorly drained phase of the Coloso series, which are now classified in the Aeric Fluventic Tropaquepts Subgroup.