LOCATION MANI PREstablished Series
TAXONOMIC CLASS: Fine, mixed, semiactive, isohyperthermic Fluvaquentic Eutrudepts
TYPICAL PEDON: Mani clay--sugar cane plantation (Colors are for moist soil).
Ap--0 to 6 inches; brown (10YR 4/3) clay; weak medium granular structure; firm; sticky, plastic; many fine roots; few fine subrounded volcanic fragments; moderately acid; clear smooth boundary. (4 to 13 inches thick)
Bw1--6 to 12 inches; brown (10YR 4/3) clay; weak medium subangular blocky structure; firm; sticky, plastic; common fine roots; few fine volcanic fragments; few fine distinct strong brown (7.5YR 5/8) and brownish yellow (10YR 6/8) masses of iron accumulation and few fine distinct gray (2.5Y 6/1) areas of iron depletions; moderately acid; clear smooth boundary.
Bw2--12 to 19 inches; strong brown (7.5YR 5/6) clay; weak medium subangular blocky structure; firm; sticky, plastic; few fine roots; few fine volcanic fragments; few fine black (10YR 2/1) manganese concretions; common fine distinct brown (10YR 4/3) masses of iron accumulation and common fine distinct gray (10YR 5/1) areas of iron depletions; moderately acid; clear smooth boundary.
Bw3--19 to 32 inches; strong brown (7.5YR 5/6) clay; weak fine subangular blocky structure; firm; sticky, plastic; few fine roots; few fine black (10YR 2/1) manganese concretions; many medium distinct gray (10YR 5/1) areas of iron depletion; moderately acid; clear smooth boundary. (Combined thickness of the Bw horizons range from 19 to 33 inches)
Cg--32 to 58 inches; gray (10YR 5/1) clay; massive; firm; sticky, plastic; few fine black (10YR 2/1) manganese concretions; many medium distinct strong brown (7.5YR 5/6) masses of iron accumulation; moderately acid.
TYPE LOCATION: Mayaguez, Puerto Rico. Approximately 2.1 miles southwest of the city of Anasco from the intersection of P.R. Hwy. 402 and P.R. Hwy. 404, about 300 feet north from the northwest side of the Eugenio Maria de Hostos Municipal Airport, and about 10 feet north of road in a sugar cane field. USGS Rincon topographic quadrangle (1966); lat. 18 degrees 15 minutes 31 seconds N. and long. 67 degrees 09 minutes 23 seconds W.
RANGE IN CHARACTERISTICS: Solum thickness range from 20 to 40 inches. The COLE values in the A and Bw horizons are less than 0.09. Reaction is moderately acid or slightly acid throughout.
The A or Ap horizon has hue of 7.5YR to 2.5Y, value of 3 to 5, and chroma of 1 to 4. Where value is 3 or less, it is less than 8 inches in thickness. Iron accumulations in shades of brown range from none to few. Texture is clay.
The Bw horizon has hue of 7.5YR to 2.5Y, value of 4 or 5, and chroma of 3 to 6. Redoximorphic features in shades of gray, green, yellow, brown, and red range from few to many. Texture is clay.
The Bwg horizon, where present, has hue of 7.5YR to 2.5Y, value of 4 or 5, and chroma of 1 or 2. Redoximorphic features in shades of green, yellow, brown, and red range from few to many. Texture is clay.
The BC horizon, where present, has hue of 2.5Y, value of 4 or 5, and chroma of 3. Redoximorphic features in shades of gray, yellow, brown, and red range from few to common. Texture is clay.
The Cg horizon has hue of 10YR to 5Y, value of 5 to 7, and chroma of 1 or 2. Redoximorphic features in shades of gray, green, yellow, brown and red range from few to many. Texture is clay.
COMPETING SERIES: There are no known series in the same family.
GEOGRAPHIC SETTING: Mani soils are on flood plains and terraces of the Humid Coastal Plains MLRA of Puerto Rico. Slopes range from 0 to 2 percent. They formed in fine textured alluvial deposits of mixed origin. The climate is humid tropical. The average annual precipitation range from 45 to 122 inches and the average annual temperature ranges from 76 to 80 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bajura, Coloso, Dique, Lares, and Toa series. Bajura, Coloso, Dique, and Toa soils are on flood plain positions. In addition, Bajura soils poorly drained, Coloso soils have kaolinitic mineralogy and more clay in the control section, the well drained Dique soils are and natural levees near the stream channel, and have fine-loamy control sections, and the well drained Toa soils have mollic epipedons. Lares soils are on higher terrace positions, have argillic horizons, and have more clay in the control section.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; moderately slow permeability.
USE AND VEGETATION: Most areas of Mani soils are used for pastureland and sugar cane. The vegetation consists of native and introduced grasses, shrubs, and trees.
DISTRIBUTION AND EXTENT: River flood plains and terraces in humid coastal plains of Puerto Rico. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Raleigh, North Carolina.
SERIES ESTABLISHED: Mayaguez, Puerto Rico. The name is from the Mani ward, where it was first recognized.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Ochric epipedon - the zone from 0 to 6 inches (Ap horizon).
Cambic horizon - the zone from 6 to 32 inches (Bw1, Bw2, and Bw3 horizons).
The Mani series was formerly included in the Coloso series.
The water table ranges from 24 to 48 inches in most years.
ADDITIONAL DATA: Characterization pedon - Mayaguez Municipality, Puerto Rico; S87PR007004. Sample by NSSL, Lincoln, NE. April, 1987.
Mani soils are in MLRA 272.