LOCATION DAGUEY PREstablished Series
TAXONOMIC CLASS: Very-fine, kaolinitic, isohyperthermic Inceptic Hapludox
TYPICAL PEDON: Daguey clay--pasture. (Colors are for moist soil.)
Ap--0 to 10 inches; brown (7.5YR 4/4) clay; weak medium subangular blocky parting to moderate fine granular structure; firm, slightly sticky, slightly plastic; very strongly acid; abrupt wavy boundary. (8 to 12 inches thick)
Bo1--10 to 14 inches; reddish brown (5YR 5/4) clay; weak medium subangular blocky structure; firm, slightly sticky, slightly plastic; thin patchy clay films; very strongly acid; clear smooth boundary. (3 to 5 inches thick)
Bo2--14 to 23 inches; yellowish red (5YR 4/6) clay; few medium distinct yellowish brown (10YR 5/4) mottles; moderate medium subangular and angular blocky structure; firm, slightly sticky, slightly plastic; thin patchy clay films; very strongly acid; clear smooth boundary. (6 to 11 inches thick)
Bo3--23 to 31 inches; red (2.5YR 4/6) clay; strong medium and fine subangular blocky structure; firm, slightly sticky, slightly plastic; thin continuous clay films on ped faces; very strongly acid; gradual smooth boundary. (6 to 10 inches thick)
Bo4--31 to 43 inches; red (2.5YR 4/6) clay; strong medium and fine subangular blocky structure; firm, slightly sticky, slightly plastic; thin patchy clay films; very strongly acid; gradual smooth boundary. (8 to 14 inches thick)
Bo5--43 to 59 inches; red (2.5YR 4/6) clay; moderate fine subangular blocky structure; firm, slightly sticky, slightly plastic; thin patchy clay films; very strongly acid; gradual smooth boundary. (10 to 20 inches thick)
Bo6--59 to 72 inches; red (2.5YR 4/6) clay; weak medium and fine subangular blocky structure; firm, slightly sticky, slightly plastic; very thin patchy clay films; few small angular fragments of rock; very strongly acid; clear smooth boundary. (10 to 16 inches thick)
C--72 to 86 inches; yellowish red (5YR 4/6) silty clay loam; common fine strong brown (7.5YR 5/6) and reddish yellow (7.5YR 6/6) mottles; massive with evidence of original rock structure; friable, slightly sticky, slightly plastic; very strongly acid; gradual smooth boundary. (12 to 18 inches thick)
Cr--86 to 90 inches; Saprolite with well defined rock structure, similar in color and texture to C1 horizon.
TYPE LOCATION: Cibuco SCD, Puerto Rico; 40 feet west of Highway 113, 80 feet south of road junction to house.
RANGE IN CHARACTERISTICS: The solum is 60 to 80 inches thick. The soil is strongly or very strongly acid. Catlon exchange capacity ranges from 8 to 16 meq/100 grams of clay in the kandic horizon. The organic carbon content in the upper 6 inches of the kandic horizon ranges from 1.0 to 1.6.
The Bo horizon has hue of 10R or 2.5YR, value of 4 to 5 and chroma of 6 through 8. Yellowish brown mottles are few or common and are more evident in the upper B horizons.
COMPETING SERIES: The Aibonito and Alonso series are in the same family. The Aibonito soils have yellower B horizons. The Alonso soils have darker colors with chroma of 3 or less.
GEOGRAPHIC SETTING: The Daguey soils are gently sloping to steep soils on stable hilltops, side slopes, and foot slopes of the volcanic uplands with slope of 2 to 40 percent. The soil is formed in fine textured residuum from very highly weathered basic volcanic rocks. The climate is humid tropical. The average annual precipitation ranges from 70 to 85 inches and the mean annual temperature ranges from 74 to 76 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Consumo and Humatas soils. The Consumo soils occur on steeper less stable surfaces and have thinner B horizons. The Humatas soils have a CEC of more than 24 megs.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: Coffee, pasture and food crops.
DISTRIBUTION AND EXTENT: Humid uplands of Puerto Rico. The series is of moderate extent, about 16,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Raleigh, North Carolina
SERIES ESTABLISHED: Ponce Survey Area, Puerto Rico; 1971.
REMARKS: The classification was updated with the 4/91 draft from Clayey, oxidic, isohyperthermic Orthoxic Tropohumults to Very-fine, mixed, isohyperthermic Typic Kandiudox. The previous OSED was dated 4/87.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - zone from 0 to 10 inches (A horizon)
Oxic horizon - zone from 10 to 72 inches (Bo horizons)
ADDITIONAL DATA: Characterization data are available for pedon S61PR-8-3 and S61PR-8-6.