LOCATION IZAGORA AL+FL GA MS NC SC VA

Established Series
Rev. PGM
10/2018

IZAGORA SERIES

The Izagora series consists of deep, moderately well drained, moderately permeable soils that formed in loamy and clayey sediments on terraces in the Coastal Plain. Slope ranges from 0 to 8 percent.

TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, thermic Aquic Paleudults

TYPICAL PEDON: Izagora fine sandy loam--pasture. (Colors are for moist soil.)

Ap1--0 to 6 inches; dark yellowish brown (10YR 3/4) fine sandy loam; weak fine granular structure; very friable; many fine and medium roots; few wormcasts; medium acid; gradual smooth boundary. (3 to 10 inches thick)

Ap2--6 to 11 inches; mixed dark grayish brown (10YR 4/2) and dark yellowish brown (10YR 3/4) fine sandy loam; weak fine granular structure; very friable; many fine and medium roots; few wormcasts; moderately acid; clear smooth boundary. (0 to 6 inches thick)

Bt1--11 to 18 inches; yellowish brown (10YR 5/6) loam; weak medium subangular blocky structure; friable; common fine and medium roots; old root channels filled with material from Ap horizons; sand grains coated and bridged with clay; strongly acid; gradual wavy boundary.

Bt2--18 to 30 inches; yellowish brown (10YR 5/6) loam; few medium distinct light brownish gray (10YR 6/2) mottles and faint strong brown (7.5YR 5/6) stains around roots; moderate medium subangular blocky structure; friable; common fine roots; few soft black bodies; few thin clay films on faces of some peds; very strongly acid; gradual wavy boundary.

Bt3--30 to 46 inches; yellowish brown (10YR 5/6) clay loam; common medium distinct light gray (10YR 7/1), strong brown (7.5YR 5/6), and yellowish red (5YR 4/6) and few fine prominent dark red mottles; moderate medium subangular blocky structure; firm; few fine roots; few uncoated sand grains; few thin clay films on faces of peds and in pores; few fine flakes of mica; very strongly acid; gradual wavy boundary. (Combined thickness of the upper Bt horizons is 19 to 50 inches.)

Bt4--46 to 63 inches; mottled brownish yellow (10YR 6/6), light gray (10YR 7/1), strong brown (7.5YR 5/6), and dark red (2.5YR 3/6) clay; moderate medium subangular blocky structure; firm; few fine roots; few thin clay films on faces of some peds; few fine flakes of mica; very strongly acid; gradual wavy boundary. (12 to 30 inches thick)

BC--63 to 91 inches; mottled gray (10YR 6/1), brownish yellow (10YR 6/6), strong brown (7.5YR 5/6), and yellowish red (5YR 4/6) clay loam; weak coarse subangular blocky structure; very firm; few soft black bodies; few fine flakes of mica; very strongly acid.

TYPE LOCATION: Wilcox County, Alabama; 2 3/4 miles west of Canton Bend on gravel road, then 1/4 mile north of road on the Alabama Agricultural Experiment Substation in the NE1/4SW1/4 sec. 29, T. 13 N., R. 7 E.

RANGE IN CHARACTERISTICS: Solum thickness exceeds 60 inches. A few flakes of mica and few to common soft black bodies are in the Bt and BC horizons in most pedons.

The Ap or A horizon has hue of 10YR or 2.5Y, value of 3 to 5 and chroma of 1 to 4. Texture is loamy fine sand, fine sandy loam, loam, or silt loam. The E horizon, when present, has hue of 10YR or 2.5Y, value of 5 to 7, and chroma of 2 to 4. Texture of the A and E horizons is very fine sandy loam, sandy loam, fine sandy loam, loamy sand, loamy fine sand, or loam. Reaction of the A and E horizons ranges from moderately acid to extremely acid.

The upper part of the Bt horizon has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 4 to 8. Gray, brown, and red mottles range from few to common below a depth of about 18 inches. Texture is loam, clay loam, or rarely silt loam or silty clay loam. The lower part of Bt horizon and the BC horizon has the same colors as above and in addition, may have hue of 5Y with chroma of 0 to 2 or is neutral. It is mottled in shades of yellow, gray, brown, and red, with gray color increasing with depth. Texture is clay loam, silty clay or clay. Clay content of the upper 20 inches of the argillic horizon ranges from 18 to 30 percent, averaging about 22 percent; the clay content of the lower Bt horizons ranges from 35 to 50 percent, averaging about 40 percent. Silt content is more than 30 percent throughout the solum. The Bt horizon ranges from strongly acid to extremely acid.

COMPETING SERIES: These include the Goldsboro, Kullit, Quitman, and Wrightsboro series in the same family. Goldsboro and Wrightsboro soils have less than 30 percent silt in their control section. Kullit soils have Bt horizons dominated by hues of 7.5YR or redder. Quitman soils have less than 35 percent clay in the lower part of the Bt horizons.

GEOGRAPHIC SETTING: Izagora soils are on nearly level to gently sloping marine and fluvial terraces of the Coastal Plain. Slopes range from 0 to 8 percent but are dominantly 1 to 3 percent. The soil formed in marine or fluvial deposits that range in texture from loams to clays. Near the type location, the mean annual temperature is 65 degrees F., and the mean annual precipitation is 53 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Angie, Annemaine, and Cahaba series. Angie and Annemaine soils have more than 35 percent clay in their control sections. In addition, Annemaine soils have Bt horizons with redder hue. Cahaba soils are well drained and have Bt horizons with redder hue.

DRAINAGE AND PERMEABILITY: Moderately well drained; slow to medium runoff; moderate permeability in the upper solum and slow in the lower solum.

USE AND VEGETATION: Largely cleared and used for the production of corn, soybeans, hay, and pasture crops. Forested areas are mainly mixed hardwoods of oaks, gums, poplar, and hickory with few scattered pines.

DISTRIBUTION AND EXTENT: Alabama, Arkansas, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, and possibly Texas. The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Auburn, Alabama

SERIES ESTABLISHED: Holmes County, Florida; 1942.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - the zone from the surface to a depth of about 11 inches (Ap1, Ap2 horizons)

Argillic horizon - the zone from about 11 to 63 inches (Bt1, Bt2, Bt3, Bt4 horizons).

Aquic features - have within a depth of 30 inches, mottles that have color value, moist, or 4 or more, and chroma, moist, of 2 or less, and mottles of higher chroma due to segregation of iron.

ADDITIONAL DATA: Data for the typical pedon were obtained by the Alabama Agricultural Experiment Station - Sample S71-Ala-66-8-(1-7) and are available.

National Cooperative Soil Survey
U.S.A.