LOCATION VIDRINE LA+TXEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Aquic Glossudalfs
TYPICAL PEDON: Vidrine silt loam, on a smoothed mound, in cropland. (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; common medium faint gray (10YR 5/1) iron depletions and brown (10YR 4/3) iron accumulations; few medium dark brown masses; strongly acid; clear wavy boundary. (5 to 12 inches thick)
BE--8 to 16 inches; yellowish brown (10YR 5/4) silt loam; weak fine subangular blocky structure; friable; few fine roots; many medium tubular pores; many medium faint pale brown (10YR 6/3) and light yellowish brown (10YR 6/4) iron accumulations; common medium yellowish brown masses; few fine faint yellowish brown (10YR 5/6) stains along roots and in pores; very strongly acid; clear irregular boundary. (5 to 18 inches thick)
Bt/E--16 to 19 inches; brown (10YR 5/3) silty clay loam; weak coarse prismatic structure parting to moderate medium subangular blocky; firm; few fine roots; common fine pores lined with clay; light gray (10YR 7/2) silt coats (E) 1 to 5 mm thick on major surfaces of peds and in cracks; many fine prominent red (2.5YR 4/8) iron accumulations; few fine faint grayish brown iron depletions; few fine yellowish brown masses; very strongly acid; clear wavy boundary. (2 to 4 inches thick)
Btg1--19 to 34 inches; grayish brown (10YR 5/2) silty clay; moderate coarse prismatic structure parting to moderate fine angular blocky; firm; few fine roots; common distinct clay films on surfaces of peds; few thin silt coats on vertical surfaces of peds; many fine and medium prominent red (2.5YR 4/8) iron accumulations; common fine yellowish brown masses; strongly acid; gradual wavy boundary. (10 to 30 inches thick)
Btg2--34 to 50 inches; light brownish gray (10YR 6/2) silty clay loam; moderate medium subangular blocky structure; firm; common distinct clay films on surfaces of peds; common fine prominent red (2.5YR 4/8) and common fine distinct yellowish brown (10YR 5/6) iron accumulations; few medium brown masses; few fine black stains; slightly acid; gradual wavy boundary. (12 to 30 inches thick)
BCg--50 to 80 inches; light gray (10YR 7/2) silt loam; weak coarse subangular blocky structure; firm; few faint clay films on vertical faces of peds; common medium prominent brownish yellow (10YR 6/8) and few fine prominent reddish brown (5YR 5/4) iron accumulations; neutral.
TYPE LOCATION: Evangeline Parish, Louisiana; about 2 miles northeast of Basile; 90 yards south of highway along field road, 34 yards west of lane on a smoothed mound area. NE1/4NW1/4 sec. 28, T. 6 S., R. 2 W.
RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches. Combined thickness of A and BE horizons is 14 to 22 inches where mounds are smoothed and 18 to 30 inches in the natural state. The A and BE horizons are very strongly acid to moderately acid. The Btg and BCg horizons are strongly acid to moderately alkaline. Grayish colors caused by wetness are within the upper 10 inches of the Btg horizon.
The A horizon has hue of 10YR, value 3 to 6, and chroma of 2 or 3. Where color value is 3, thickness is less than 6 inches. Texture is silt loam or very fine sandy loam.
The BE horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4. Grayish mottles are in the BE horizon in some pedons. Texture is silt loam or very fine sandy loam.
The Bt part of the Bt/E horizon has hue of 10YR, value of 4 to 6, and chroma of 3 or 4. Texture is silt loam or silty clay loam. The E part of the Bt/E horizon has hue of 10YR, value of 6 or 7, and chroma of 2 or 3. The E part of the B/E horizon makes up as much as 25 percent of the horizon by volume.
The upper part of the Btg horizon has hue of 10YR, value of 4 to 6, and chroma of 1 or 2. Iron accumulations in shades of red or brown range from common to many. Colors in the lower part of the Btg horizon are similar to those in the upper part, but range to include value of 5 and chroma of 4 or 6. Texture of the Btg horizon is silty clay loam or silty clay. Calcium carbonate concretions range from none to common in the lower part of the Btg horizon.
The BCg horizon has hue of 10YR or 2.5Y, value of 4 to 7, and chroma of 1 or 2. Texture is silt loam, clay loam, silty clay loam, or silty clay and is stratified in some pedons.
COMPETING SERIES: There are no other series in the same family. Series in similar families are the Acadia, Orcadia, and Texla series. Acadia soils do not have a glossic horizon. Orcadia soils do not have aquic conditions in the upper part of the argillic horizon in most years and typically are more acid throughout. Texla soils have a fine-silty particle-size control section.
GEOGRAPHIC SETTING: Vidrine soils are on convex circular mounds or mound scars, where smoothed, on nearly level to very gently sloping uplands. Slope ranges from 0 to 3 percent. Mounds are 1 to 4 feet high and about 70 feet in diameter. In some areas Vidrine soils are on convex sideslopes with low relief. These soils formed in late Pleistocene age loamy and clayey sediments. Mean annual air temperature ranges from about 67 to 70 degrees F. Mean annual rainfall ranges from about 45 to 60 inches. Elevation ranges from 5 to 50 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Acadia, Crowley, Kinder, Leton, Mamou, and Mowata series. These soils are slightly lower in intermound areas. Acadia and Crowley soils do not have a glossic horizon. Kinder, Leton, and Mamou soils have a fine-silty particle-size control section. Mowata soils are Aqualfs and have grayer colors throughout.
DRAINAGE AND PERMEABILITY: Moderately well drained to somewhat poorly drained. Permeability is slow. Runoff is medium to high. A thin perched water table is above the Btg horizon for 2 to 4 months in winter and spring.
USE AND VEGETATION: In cultivated areas most of the Vidrine soils (mounds) have been smoothed and are cropped to rice, row crops, and pasture. Many areas have encroachment of hardwood and pine trees. Native vegetation was mainly tall prairie grass.
DISTRIBUTION AND EXTENT: LRR T (MLRA 150) Coast Prairie of Louisiana and southeast Texas. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas.
SERIES ESTABLISHED: Evangeline Parish, Louisiana; 1970.
REMARKS: These soils were previously mapped as mound phases of the Acadia, Crowley, and Wrightsville soils. These soils are reclassified 01/2000 from coarse-silty over clayey, mixed, hyperthermic Glossaquic Hapludalfs to fine, smetitic, hyperthermic Aquic Glossudalfs based on mineralogy of associated soils, pedon descriptions, field notes, and consultation with field staff. Temperature regime changed to thermic 11/2004 based on four year temperature study. Complete characterization and further study of the series is needed.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon--0 to 16 inches (Ap and BE horizon)
Argillic horizon--16 to 50 inches (Bt/E, Btg1, and Btg2 horizons)
Glossic horizon--16 to 19 inches (Bt/E horizon)
Aquic conditions in upper part of argillic horizon in most years.
ADDITIONAL DATA: none
TAXONOMIC VERSION: Keys to Soil Taxonomy, Ninth Edition, 2003.