LOCATION HAYTI                   MO+AR

Established Series
Rev. KDV-LJG
02/2013

HAYTI SERIES

The Hayti series consists of very deep, poorly drained, slowly permeable soils formed in alluvium. These soils are on flood plains and have slopes of 0 to 2 percent. Mean annual temperature is 60 degrees F, and mean annual precipitation is 49 inches.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, nonacid, thermic Mollic Fluvaquents

TYPICAL PEDON: Hayti silty clay loam - on a one percent slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 6 inches; very dark grayish brown (10YR 3/2) silty clay loam; grayish brown (10YR 5/2) dry; few fine prominent dark reddish brown (5YR 3/4) mottles; weak fine granular structure; firm; common fine roots; neutral; clear smooth boundary. (6 to 10 inches thick)

C1--6 to 13 inches; dark gray (10YR 4/1) silty clay loam; common fine prominent dark reddish brown (5YR 3/4) mottles; moderate medium subangular blocky structure; firm; common fine roots and pores; slightly acid; clear smooth boundary.

C2--13 to 17 inches; dark gray (5Y 4/1) silty clay loam; common fine prominent dark reddish brown (5YR 3/4) mottles; weak fine subangular blocky structure; firm; few fine roots and pores; slightly acid, abrupt smooth boundary.

C3--17 to 22 inches; gray (5Y 5/1) and dark gray (2.5Y 4/1) silt loam; common medium prominent reddish brown (5YR 4/4) mottles; weak fine subangular blocky structure; friable; common fine pores; few worm casts; moderately alkaline; abrupt smooth boundary.

C4--22 to 30 inches; dark gray (5Y 4/1) silty clay loam; common fine prominent dark reddish brown (5YR 3/3) mottles; weak fine subangular blocky structure; firm; common very fine pores; few worm casts; dark grayish brown (2.5Y 4/2) interiors of some peds; neutral; abrupt smooth boundary.

C5--30 to 37 inches; dark gray (10YR 4/1) silty clay loam; common medium prominent dark reddish brown (5YR 3/4) mottles; weak fine subangular blocky structure; firm; dark grayish brown (2.5Y 4/2) interiors of some peds; neutral; abrupt smooth boundary.

C6--37 to 60 inches; dark grayish brown (2.5Y 4/2) and gray (5Y 5/1) silt loam; common medium prominent brown (7.5YR 4/4) mottles and many fine dark reddish brown (2.5YR 3/4) stains; massive; friable; neutral; gradual smooth boundary.

TYPE LOCATION: Pemiscot County, Missouri; about one mile southeast of Hayti; 1310 feet south and 1410 feet east of the northwest corner of sec. 11, T. 18 N., R. 12 W. Latitude 36 degrees, 12 minutes, 57.6 seconds N., longitude 89 degrees, 43 minutes, 53.7 seconds W., NAD83.

RANGE IN CHARACTERISTICS: The Ap or A horizon has hue of 10YR or 2.5Y, value of 2 or 3, 4 or 5 dry and chroma of 1 or 2. It commonly is silty clay loam or silty clay, but may have coarser textured overwash. It is neutral or slightly acid.

The C horizon has hue of 10YR to 5Y, value of 4 to 6 and chroma of 1 or 2. It is silty clay loam commonly stratified with layers of very fine sandy loam and silt loam, but individual layers may range from sandy loam to clay. It is slightly acid to mildly alkaline.

COMPETING SERIES: There are no other series in the family. A similar series is Gideon which is fine-loamy.

GEOGRAPHIC SETTING: Hayti soils are on flood plains and formed in alluvium. Typically, Hayti soils are in old channels and depressional areas. Slopes range from 0 to 2 percent. Mean annual temperature ranges from 59 to 62 degrees F, and mean annual precipitation ranges from 48 to 50 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bowdre, Caruthersville, Commerce, Mhoon, Sharkey, and Tunica soils. Bowdre soils have contrasting textures in the control section. Caruthersville soils are coarse-silty. Commerce and Mhoon soils have a color value moist of 4 or more in the A horizon if it is 6 inches or more thick. Sharkey and Tunica soils have fine textures. These soils are on similar or higher positions.

DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is slow. Permeability is slow. An apparent water table has an upper limit of 0 to 1 foot during November to March.

USE AND VEGETATION: Most areas are cultivated. Native vegetation is mixed hardwoods.

DISTRIBUTION AND EXTENT: Flood plains of the Mississippi River in Missouri and Arkansas. The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: AUBURN, ALABAMA

SERIES ESTABLISHED: Pemiscot County, Missouri, 1972.

REMARKS: Diagnostic horizons and features recognized in this series are: ochric epipedon - the zone from the surface of the soil to a depth of 6 inches; previously this series was classified as a Typic subgroup. Considering color and thickness range of the Ap horizon, it was changed to a mollic subgroup.

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National Cooperative Soil Survey
U.S.A.