LOCATION KEYLARGO FL
Established Series
Rev. GWH/CAP/RBT
03/2021
KEYLARGO SERIES
MLRA(s): 156A
Soil Survey Regional Office (SSRO) Responsible: Auburn, Alabama
Depth Class: Very deep
Drainage Class: Very poorly drained
Saturated Hydraulic Conductivity: High to very high in the organic material and negligible in the rock material
Index Surface Runoff: High to very high
Parent Material: Organic materials over oolitic limestone bedrock
Slope: 0 to 1 percent
Elevation: -1.0 to 3 feet above mean sea level.
Mean Annual Air Temperature: 26 degrees C. (78 degrees F.)
Mean Annual Precipitation: 1651 millimeters (65 inches)
TAXONOMIC CLASS: Euic, isohyperthermic Typic Sulfisaprists
TYPICAL PEDON: Keylargo muck in a tidal mangrove swamp. (Colors are for moist soil unless otherwise stated.)
Oase1--0 to 15 centimeters (0 to 6 inches); very dark gray (10YR 3/1) muck, gray (10YR 5/1), dry; 20 percent unrubbed fiber content, 5 percent rubbed fiber; moderate sulfurous odor; common fine and medium live roots; 5 percent by volume mineral content; neutral (pH 6.8); clear smooth boundary.
Oase2--15 to 178 centimeters (6 to 70 inches); dark reddish brown (5YR 3/2) muck; 30 percent unrubbed fiber content, 5 percent rubbed fiber; moderate sulfurous odor; common fine and medium live roots; 2 percent by volume mineral content; neutral (pH 6.8); abrupt smooth boundary. [130 to 178 centimeters (51 to 90 inches thick)]
2R--178 centimeters (70 inches); weakly to strongly cemented oolitic limestone bedrock; solution holes up to 102 centimeters (40 inches) or more deep can be filled with sandy and/or loamy material.
TYPE LOCATION: Monroe County, Florida; Key Largo; 1.7 miles west of the intersection of roads 905 and 905A, 110 feet south of 905A, and 110 feet south and 710 feet east of the northwest corner of Sec. 27, T. 59 S., R. 40 E.; latitude 25 degrees 17 minutes 0.47 seconds N longitude 80 degrees 19 minutes 51.22 seconds W; WSG84; USGS Card Sound, FL quadrangle.
RANGE IN CHARACTERISTICS:
Solum thickness: 150 to 229 centimeters (59 to 90 inches)
Depth to seasonally high water table: 0 to 15 centimeters (0 to 6 inches)
Soil Reaction: Slightly acid to slightly alkaline throughout
Oxidized Reaction: Extremely or ultra acid
Sulfurous odor: Slight to strong throughout
Depth of the organic material: 150 to 229 centimeters (59 to 90 inches)
Depth to limestone bedrock: 150 to 229 centimeters (59 to 90 inches)
Fiber content: Un-Rubbed 5 to 75 percent; rubbed less than 17 percent
Particle-size control section, mineral (weighted averages):
Mineral content: 0 to 12 percent
Range of Individual Horizons:
Oase horizon:
Color: hue of 5YR to 2.5Y or Neutral, value of 2 or 3, and chroma of 3 or less
Texture: muck
EC (mmhos/cm): 16 to 32 or more
Exchangeable Sodium: 13 to 40 percent or more
Sodium Absorption Ratio: 13 to 30 percent or more
2R horizon: weakly to strongly cemented oolitic limestone bedrock, with solution holes filled with sandy and/or marly materials. Solution holes can be up to 102 centimeters (40 inches) or more.
COMPETING SERIES: This is the
Islamorada series.
Islamorada soils have bedrock at depths of less than 100 centimeters (39 inches) and occur on similar landform positions.
GEOGRAPHIC SETTING:
Landscape: Lower Coastal Plain
Landform(s): marine marshes, swamps, or low broad tidal flats on the Key West Islands and/or along the southern coast of the Florida Peninsula
Parent material: Organic materials over oolitic limestone bedrock
Mean annual temperature: 25 to 27 degrees C (77 to 81 degrees F)
Mean annual precipitation: 1067 to 1778 millimeters (42 to 70 inches)
Frost-free period: 365 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Cudjoe soils - have marly silt loam particle-sized control sections and have bedrock at depths of 50 centimeters (20 inches) or less
Islamorada soils have bedrock at depths of 50 to 100 centimeters and occur on similar landform positions.
Keywest soils have stratification of marl and muck materials over oolitic limestone at 100 to 150 centimeters deep and occur in similar landform positions.
Lignumvitae soils have a marly silt loam particle-sized control section and do not have organic soil materials throughout.
Matecumbe soils have bedrock at depths less than 18 centimeters and occur on similar landform positions.
Saddlebunch soils have a marly silt loam particle-sized control section, have bedrock at depths less than 50 centimeters (20 inches) and occur on slightly higher landform positions.
Tavernier soils have bedrock at depths of 18 to 50 centimeters and occur on similar landform positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Very poorly drained
Saturated hydraulic conductivity (Ksat): High to very high
Runoff: High to very high
Depth to seasonal high-water table: 0 to 15 centimeters (0 to 6 inches)
Flooding frequency and duration: very frequent and very brief duration from tides, subject to flooding by storm surge and hurricanes
USE AND VEGETATION:
Major uses: wildlife habitat and water quality.
Dominant vegetation: red, black, and white mangroves.
DISTRIBUTION AND EXTENT: MLRA 156A Florida Everglades and Associated Areas.
Extent: limited
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Auburn, Alabama.
SERIES ESTABLISHED: Monroe County, Florida; 1989.
REMARKS:
These soils were formerly classified as Typic Haplosaprists and are revised here to the twelfth edition of the keys (2014).
Diagnostic horizons and features recognized in this Pedon:
1. Histic epipedon - 0 to 178 centimeters (0 to 70 inches) (Oa1, Oa2 horizons)
2. Peraquic feature - the zone from 0 to 203 centimeters (0 to 80 inches).
3. Lithic contact - 178 centimeters (70 inches) (2R horizon)
4. Aquic conditions - Endosaturation ranges from 0 to 203 centimeters (0 to 80 inches)
5. Sulfidic feature - the zone from 0 to 178 centimeters (0 to 70 inches) contains sulfidic soil materials (Oase2 incubated pH 3.3).
ADDITIONAL DATA:
Laboratory data is available on the National Soil Survey website at: http://ncsslabdatamart.sc.egov.usda.gov/querypage.aspx
OSD User Site ID: S1988FL087004
OSD User Pedon ID: S1988FL087004
National Cooperative Soil Survey
U.S.A.