LOCATION FROZARD LA
Established Series
Rev. JDS;KM:WLC
10/2018
FROZARD SERIES
The Frozard series consists of very deep, somewhat poorly drained, slowly permeable soils that formed in loess on low Pleistocene age terraces. These soils are on broad, low ridges and flats. Water runs off the surface at a medium rate. Slopes range from 0 to 2 percent.
TAXONOMIC CLASS: Fine-silty, mixed, superactive, thermic Aeric Epiaqualfs
TYPICAL PEDON: Frozard silt loam on a less than 0.5 percent convex slope in a cultivated field. (Colors are for moist soil.)
Ap--0 to 6 inches; dark brown (10YR 4/3) silt loam; weak fine granular structure; very friable; many fine roots; strongly acid; abrupt smooth boundary. (5 to 9 inches thick)
Bt1--6 to 11 inches; dark grayish brown (10YR 4/2) silty clay loam; moderate medium prismatic structure that parts to moderate medium subangular blocky; firm; common fine roots concentrated between peds; thick very dark gray (10YR 3/1) clay films on horizontal and vertical surfaces of peds; thin patchy silt coatings on some vertical surfaces of peds; few medium black concretions; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; neutral; clear smooth boundary. (4 to 8 inches thick)
Bt2--11 to 14 inches; dark grayish brown (10YR 4/2) silty clay loam; moderate medium prismatic structure that parts to moderate fine subangular blocky; very firm; common fine roots; thin dark gray clay films on horizontal and vertical surfaces of peds; thin patchy silt coatings on some vertical ped surfaces; few fine black concretions; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; moderately alkaline; clear smooth boundary. (3 to 8 inches thick)
Btg1--14 to 19 inches; grayish brown (10YR 5/2) silty clay loam; moderate medium prismatic structure that parts to moderate fine subangular blocky; very hard; few fine roots; thin dark gray clay films on horizontal and vertical surfaces of peds; thin patchy silt coatings on some vertical ped surfaces; common medium and few coarse black concretions; many medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; strongly alkaline; gradual wavy boundary. (4 to 10 inches thick)
Btg2--19 to 29 inches; grayish brown (10YR 5/2) silty clay loam; moderate medium subangular blocky structure that parts to moderate fine subangular blocky; very hard; few fine vesicular pores; thin patchy clay films on vertical surfaces of peds; few medium and coarse white concretions (calcium carbonate); common medium and few coarse black concretions; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; strongly alkaline; gradual wavy boundary. (0 to 14 inches thick)
Btg3--29 to 41 inches; grayish brown (10YR 5/2) silty clay loam; weak medium prismatic structure that parts to weak fine subangular blocky; very hard; few fine vesicular pores; thin patchy clay films on vertical surfaces of peds; common medium and few coarse black concretions; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; common fine faint light brownish gray iron depletions; moderately alkaline; gradual wavy boundary. (10 to 15 inches thick)
Btg4--41 to 56 inches; grayish brown (10YR 5/2) silt loam; weak medium prismatic structure that parts to weak medium subangular blocky; very hard; few fine vesicular pores; thin patchy clay films inside some pores; thin patchy silt coatings on some vertical ped surfaces; common medium black concretions; many medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; common medium faint light brownish gray (10YR 6/2) iron depletions; moderately alkaline; clear wavy boundary. (8 to 20 inches thick)
BCg--56 to 66 inches; light brownish gray (10YR 6/2) silt loam; weak medium prismatic structure; hard; few fine vesicular pores; thin patchy clay films inside some pores; many fine black nodules; few medium and coarse white concretions (calcium carbonate); many coarse distinct yellowish brown (10YR 5/6) masses of iron accumulation; few medium distinct dark yellowish brown (10YR 4/4) masses of iron accumulation; slightly alkaline.
TYPE LOCATION: St. Landry Parish, Louisiana; about 2.8 miles southeast of Grand Coteau, 0.5 mile south of La. Highway 93, 275 feet east of N-S gravel road, Spanish Land Grant sec. 111, T. 7 S., R. 4 E.
RANGE IN CHARACTERISTICS: Thickness of the solum ranges from 40 to about 80 inches.
The Ap horizon has hue of 10YR, value of 4 or 5, and chroma of 1 to 3. Reaction ranges from strongly acid to neutral.
The Bt horizon has hue of 10YR, value of 4 or 5, and chroma of 2 to 4. Ped coatings have hue of 10YR, value of 2 or 3, and chroma of 1 or 2. Texture is silty clay loam or silt loam. Iron accumulations in shades of brown and iron depletions in shades of gray are common to many. The exchangeable sodium percentage averages from 5 to 15 percent in the upper 40 cm. of the Bt horizon. Reaction ranges from neutral through strongly alkaline. Sand content ranges from 5 to 10 percent.
The BC horizon has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 1 or 2. Texture is silty clay loam or silt loam. Iron accumulations in shades of brown range from common to many. Reaction of the BC horizon ranges from slightly alkaline to strongly alkaline. Calcium carbonate concretions are few or common.
COMPETING SERIES: These are the
Acy,
Essen, and
Kurk series in the same family, and the
Deerford,
Dundee,
Fountain,
Fred,
Galvez,
Hebert,
Idee,
Jeanerette, McGehee, and
Patoutville series in closely related families. Acy soils have less than 5 percent exchangeable sodium in the upper 40 cm of the argillic horizon and do not have very hard or very firm consistency in the Bt and BC horizons. Deerford soils have more than 15 percent exchangeable sodium in the lower part of the B horizon. Dundee and Idee soils have more than 10 percent sand in the B horizon and are more acid. Essen and Galvez soils do not have dark peds coats in the upper part of the Bt horizon. In addition, Galvez soils are more acid in the B horizon. Fountain soils dominantly have chroma of 1 in all subhorizons between the base of the Ap and 30 inches. Fred soils have dominant chroma of more than 2 in the matrix of the B horizon and do not have more than 50 percent ped coatings that have chromas of 2 or less. Hebert soils are more acid and have an argillic horizon that has redder hue. Jeanerette soils have a mollic epipedon. Kurk soils are more acid and do not have calcium carbonate concretions in the solum. McGehee soils have a 2B horizon and have redder hue. Patoutville soils have red iron accumulations in the B horizon.
GEOGRAPHIC SETTING: Frozard soils are on Pleistocene age terraces at low elevations. They formed in loess that probably has been influenced by Mississippi River alluvium. Slopes range from 0 to 2 percent. The mean annual temperature is about 68 degrees F. near the type location and the mean annual precipitation is about 58 inches. The climate is warm and humid.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Acy series, the closely related
Jeanerette and
Patoutville series, and the
Baldwin and
Frost series. Baldwin soils are on concave parts of the landscape have a fine control section. Frost soils are along drainageways and have a glossic horizon.
DRAINAGE AND PERMEABILITY: Frozard soils are somewhat poorly drained; runoff is medium; permeability is slow. A perched water table is at depths of 1 to 3 feet below the surface December through April in normal years.
USE AND VEGETATION: Most areas are used for cropland and pastureland. Soybeans are the main crop grown.
DISTRIBUTION AND EXTENT: Southern Mississippi Valley Silty Uplands (MLRA 134) in Louisiana. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: AUBURN, ALABAMA
SERIES ESTABLISHED: St. Landry Parish, Louisiana; 1983.
REMARKS: Frozard soils were formerly included in mapping with the Acy series.
Diagnostic horizons and features recognized in the type location pedon include:
Ochric epipedon 0 to 6 inches (Ap horizon)
Argillic horizon 6 to 56 inches (Bt and Btg horizons)
Secondary carbonates 56 to 66 inches (BC horizon)
Aquic conditions 6 to 11 inches (Bt1 horizon)
Episaturation 6 to 14 inches (Bt1 and Bt2 horizons)
ADDITIONAL DATA: Laboratory analyses were run on samples from the type location pedon by NSSL, Lincoln. Nebraska (S79LA-097-005). Fertility analyses were run on samples from the Frozard survey area typical pedon in Vermillion Parish by LSU (S84LA-113-014) and are published in the Soil Survey of Vermillion Parish, Louisiana.
National Cooperative Soil Survey
U.S.A.