LOCATION FLUKER LAEstablished Series
TAXONOMIC CLASS: Fine-silty, siliceous, active, thermic Aquic Fraglossudalfs
TYPICAL PEDON: Fluker silt loam--on a 1 percent slope in woodland at an elevation of 175 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 8 inches; dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; friable; common fine roots; extremely acid; abrupt smooth boundary. (3 to 8 inches thick)
BE--8 to 13 inches; light yellowish brown (10YR 6/4) silt loam; common fine and medium yellowish brown (10YR 5/8) mottles; few fine distinct strong brown (7.5YR 5/6) and common fine faint light brownish gray (10YR 6/2) mottles; weak medium subangular blocky structure; friable; common fine random discontinuous tubular pores; few fine roots; few black and brown concretions; extremely acid; clear wavy boundary. (0 to 7 inches thick)
Bt1--13 to 18 inches; yellowish brown (10YR 5/6) silt loam; common fine and medium distinct strong brown (7.5YR 5/6) and many medium distinct light brownish gray (10YR 6/2) and grayish brown (10YR 5/2) mottles; moderate medium subangular blocky structure; friable; few fine random discontinuous tubular pores; few fine and medium roots; few black and brown concretions; thin seams of light gray (10YR 7/2) silt loam; few distinct clay films on vertical faces of some peds; very strongly acid; clear wavy boundary.
Bt2--18 to 24 inches; yellowish brown (10YR 5/6) silty clay loam; common fine and medium distinct brown (7.5YR 5/6) and many medium distinct light brownish gray (10YR 6/2) and grayish brown (10YR 5/2) mottles; moderate medium subangular blocky structure; firm; few fine roots; many distinct clay films on vertical faces of some peds; few prominent clay films on horizontal faces of peds; very strongly acid; clear wavy boundary. (Combined thickness of the Bt horizon is 9 to 19 inches)
B/E--24 to 31 inches; grayish brown (10YR 5/2) silt loam (Bt); many coarse distinct yellowish brown (10YR 5/8) and strong brown (7.5YR 5/6) mottles; moderate medium subangular blocky structure; firm; few fine and medium roots mainly in E material; many distinct clay films on vertical faces of some peds; few distinct clay films on horizontal faces of some peds; common vertical tongues of light gray (10YR 7/2) silt loam (E) about 1.5 inches wide comprising 20 percent of the horizon; very strongly acid; clear wavy boundary. (3 to 8 inches thick)
2Btx1--31 to 40 inches; yellowish brown (10YR 5/6) silt loam; common medium distinct light brownish gray (10YR 6/2) mottles; weak very coarse prismatic structure parting to moderate medium subangular blocky; very firm and brittle; few fine roots in light gray seams; few fine random discontinuous tubular pores; few faint clay films on the vertical faces of some peds; few faint clay films on horizontal faces of secondary peds; common vertical seams of light gray (10YR 7/2) silt loam are .25 inch wide and surround prisms; very strongly acid; gradual wavy boundary. (6 to 25 inches)
2Btx2--40 to 70 inches; mottled strong brown (7.5YR 5/6), pale brown (10YR 6/3) and yellowish brown (10YR 5/8) loam; weak very coarse prismatic structure parting to moderate medium subangular blocky; very firm and brittle; common fine random discontinuous tubular pores; few faint clay films on vertical faces of some peds; common vertical seams of light gray (10YR 7/2) fine sandy loam are .25 to .5 inch wide and surround prisms; very strongly acid.
TYPE LOCATION: Tangipahoa Parish, Louisiana; about 3,000 feet south of Tangipahoa, 300 feet west of U. S. Highway 51, Spanish Land Grant Sec. 39, T. 2 S., R. 7 E.
RANGE IN CHARACTERISTICS: The thickness of the solum is greater than 60 inches. Depth to the fragipan ranges from 18 to 40 inches. Reaction ranges from extremely acid to medium acid throughout the solum, except for the surface layer in areas that have been limed. Total content of sand in the particle-size control section ranges from 10 to 25 percent, commonly increasing with depth, but content of fine sand or coarser is less than 15 percent. Gray mottles are present within 16 inches of the soil surface.
The A horizon has hue of 10YR, value of 3 to 5, and chroma of 1 to 4. Where value is 3, the A horizon is less than 6 inches thick. Texture is silt loam or very fine sandy loam.
The BE horizon, where present, has hue of 10YR or 7.5YR, value of 5 or 6, and chroma of 3 to 8. Mottles, in shades of brown or gray range from few to many. Fine or very fine black and brown concretions range from none to common. The Bt horizon has hue of 10YR or 7.5YR, value of 4 to 6, and chroma of 3 to 8. Texture is silt or silty clay loam. Mottles in shades of brown or gray range from few to many. Fine and very fine black and brown concretions range from none to common.
The Bt part of the B/E horizon has hue of 10YR, value of 5 or 6, and chroma of 2 to 6. The E part has hue of 10YR, value of 6 or 7, and chroma of 2 or 3. Some pedons have a grayish E horizon or a mottled E/B horizon. Vertical tongues of E material range in width from .25 inch to 2 inches and comprise 15 to 30 percent of the horizon. Texture of the Bt part is silt loam or silty clay loam. Texture of the E part is silt loam. Brownish mottles range from few to many and from fine to coarse.
The 2Btx horizon has hue of 7.5YR or 10YR, value of 4 to 6, and chroma of 3 to 6, or it has hue of 10YR or 2.5Y, value of 5 to 7, and chroma of 1 or 2. Texture is sandy loam, fine sandy loam, loam, silt loam, or sandy clay loam. Mottles in shades of brown and gray range from few to many. Total sand content is typically greater than 25 percent.
Some pedons have a 2B or 2BC horizon below the 2Btx horizon. Where present, they have the same range in colors and reaction as the 2Btx horizon. Texture is sandy loam, fine sandy loam, or loam.
COMPETING SERIES: There are no soils in the same family. Soils in similar families are the Bude, Calloway, Hatchie, Necessity, Olivier, Prentiss, Pheba, Taft, and Woodmont series. Bude, Calloway, Necessity, and Olivier, soils have mixed mineralogy. Prentiss, Pheba, and Taft soils have a base saturation of less than 35 percent. Woodmont soils do not have an argillic horizon above the fragipan and formed in limestone residuum.
GEOGRAPHIC SETTING: Fluker soils are on level to very gently sloping stream terraces. Slopes range from 0 to 3 percent. These soils formed in a silty mantle, less than 4 feet thick, and the underlying loamy sediments. Climate is warm and humid. Mean annual temperature ranges from 60 to 70 degrees F. Average annual precipitation ranges from 55 to 65 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cahaba, Myatt, and Savannah soils. The well drained Cahaba soils are on low ridges at slightly higher elevations and are fine-loamy. The poorly drained Myatt soils are in lower positions and are fine-loamy. The moderately well drained Savannah soils are on higher positions and are fine-loamy.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is slow to medium. Permeability is moderate in the upper part of the B horizon and slow in the fragipan. The soil has a water table perched above the fragipan at a depth of 0.5 to 1.5 feet below the soil surface during wet seasons, mainly during winter and early spring.
USE AND VEGETATION: Most of the Fluker soils are in woodland or pasture. A few areas are cultivated.
DISTRIBUTION AND EXTENT: Louisiana. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Auburn, Alabama
SERIES ESTABLISHED: Tangipahoa Parish, Louisiana, 1985.
REMARKS: Classification changed from Glossaquic Fragiudalfs to Aquic Fraglossudalfs; July, 1991. Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon.........................0 to 13 inches (Ap,BE)
Argillic horizon...13 to 70 inches (Bt1,Bt2,B/E,2Btx1,2Btx2)
Glossic horizon........................24 to 31 inches
(B/E)
Fragipan... ...........................31 to 70 inches (2Btx1,2Btx2) Lithologic discontinuity...............at 31 inches.
ADDITIONAL DATA: Laboratory data on the typifying pedon were obtained from the soils laboratory of the Louisiana Agricultural Experiment Station, sample S83LA102-2.