LOCATION PINONES PREstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, acid, isohyperthermic Fluvaquentic Endoaquepts
TYPICAL PEDON: Pinones silty clay - sugarcane.
(Colors are for moist soil.)
Ap--0-4 inches; Very dark grayish brown (10YR 3/2) silty clay; common medium distinct yellowish brown (10YR 5/8) mottles; weak fine subangular blocky structure; friable, slightly sticky, plastic, many fine roots; very strongly acid; clear smooth boundary. (7 to 12 inches thick)
B21g--4-13 inches; Dark gray (10YR 4/1) silty clay; common medium distinct yellowish brown (10YR 5/6) mottles; weak medium subangular blocky structure; firm, slightly sticky, plastic, common fine roots; very strongly acid; clear smooth boundary. (7 to 12 inches thick)
B22g--13-18 inches; Dark gray (10YR 4/1) silty clay; many coarse distinct yellowish brown (10YR 5/6) mottles; weak medium subangular blocky structure firm, slightly sticky, plastic; few fine roots; very strongly acid; clear smooth boundary. (4 to 8 inches thick)
11C--18-58 inches plus; Dark reddish brown (5YR 3/2) muck: well decomposed; very strongly acid.
TYPE LOCATION: Este SCD, Humacao, Puerto Rico; 1 mile northeast of Central Pasto Viego, 100 feet west of main farm road on unimproved secondary road and 30 feet north of unimproved road.
RANGE IN CHARACTERISTICS: The A horizon is very dark grayish brown (10YR 3/2; 2.5Y 3/2), very dark gray (10YR 3/1; N 3/), very dark brown (10YR 2/2) or black (10YR 2/1; N 2/). Texture is silty clay or silty clay loam.
The B horizon is gray (10YR 5/1; 4/7, N 5/; 5Y 5/1; 6/1) or dark gray (10YR 4/1; N 4/ ; 5Y 4/1) with common to many mottles in shades of yellow and brown.
COMPETING SERIES: These are the
Bajura,
Coloso,
Corcega,
Fortuna,
Igualdad,
Maunabo,
Perchas,
Reparada,
Santoni, and
Vayas series. These soils except Reparada, lack buried organic layers within 40 inches of the surface. Bajura and Santoni soils have coefficient of linear extensibility of 0.09 or more, and they have pressure faces and slickensides. Coloso soils have slightly to medium acid reactions. Corcega soils have sandy clay loam or silty clay loam B horizons over sandy C horizons. Reparada and Vayas soils have neutral to moderately alkaline reactions.
GEOGRAPHIC SETTING: The Pinones soils occur on nearly level coastal lowlands with slope gradients from 0 to 2 percent. The regolith consists of fine textured sediments of mixed origin which overlie decomposed and partially decomposed organic layers. The climate is humid tropical. The average yearly rainfall is 80 to 90 inches and the mean annual air temperature is 77 to 80 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Coloso, Fortuna, and Maunabo series.
DRAINAGE AND PERMEABILITY: Poorly drained; runoff is slow; permeability is very slow.
USE AND VEGETATION: Natural vegetation consists of hydrophytic plants, such as, Para grass, and Camandulas. These soils are used for growing sugarcane when drained.
DISTRIBUTION AND EXTENT: Coastal areas of Puerto Rico. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Raleigh, North Carolina
SERIES ESTABLISHED: Puerto Rico; 1942