LOCATION MARTIN                  KS

Established Series
Rev. CEW
09/2012

MARTIN SERIES

The Martin series consists of deep and very deep, moderately well drained soils on uplands. They formed in colluvium and/or residuum from interbedded silty and clayey shales, limestone, and clay beds. Slopes range from 0 to 12 percent. Mean annual precipitation is about 86 centimeters and the mean annual temperature is about 13 degrees C (55 degrees F).

TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Argiudolls

TYPICAL PEDON: Martin silty clay loam - in a cultivated field. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 23 centimeters; very dark brown (10YR 2/2) silty clay loam, dark gray (10YR 4/1) dry; moderate medium granular structure; hard, firm, slightly plastic, slightly sticky; slightly acid; gradual smooth boundary. (18 to 36 centimeters thick)

BA--23 to 36 centimeters; very dark brown (10YR 2/2) silty clay loam, dark gray (10YR 4/1) dry; moderate fine and medium subangular blocky structure; hard, firm,plastic and sticky; most peds have shiny surfaces; moderately acid; gradual smooth boundary. (0 to 15 centimeters thick)

Bt1--36 to 71 centimeters; very dark grayish brown (10YR 3/2) silty clay, dark grayish brown (10YR 4/2) dry; moderate medium and coarse subangular blocky with some angular blocky structure; very hard, very firm, very plastic, very sticky; distinct continuous clay films on faces of peds; few fine distinct yellowish brown (10YR 5/4) masses of iron accumultions; common fine black manganese concretions; many fine worm casts; many root channels filled with black material; moderately acid; gradual smooth boundary.

Bt2--71 to 94 centimeters; dark grayish brown (10YR 4/2) silty clay, olive brown (2.5Y 4/4) crushed, grayish brown (10YR 5/2) dry; moderate medium and coarse angular blocky with some subangular blocky structure; very hard, very firm, very plastic, very sticky; distinct and continuous clay films on faces of peds; few fine prominent yellowish brown (10YR 5/6) and strong brown (7.5YR 5/6) masses of iron accumulations; common fine black manganese concretions; worm casts and root channels as in horizon above; slightly acid; gradual smooth boundary. (Combined thickness of the Bt horizon is 30 to 76 centimeters)

Bt3--94 to 122 centimeters; grayish brown (10YR 5/2) silty clay, light brownish gray (10YR 6/2) dry; weak coarse and medium angular blocky and subangular blocky structure; very hard, very firm, very plastic, very sticky; clay films on faces of some peds; common coarse prominent strong brown (7.5YR 5/6) and yellowish brown (10YR 5/6) masses of iron accumulations; some dark root channels; common fine black manganese concretions; neutral; diffuse boundary. (0 to 38 centimeters thick)

C--122 to 203 centimeters; coarsely mottled gray (10YR 5/1), strong brown (7.5YR 5/6), yellowish brown (10YR 5/6), and olive brown (2.5Y 4/4) silty clay, gray (10YR 6/1), reddish yellow (7.5YR 6/6), brownish yellow (10YR 6/6), and light olive brown (2.5Y 5/4) dry; massive; very hard, very firm, very plastic, very sticky; few fine black manganese concretions; neutral.

TYPE LOCATION: Douglas County, Kansas; 4.2 miles southwest of Clinton, Kansas; 1,440 feet north and 1,025 feet west of the southeast corner, sec. 31, T. 14 S., R. 18 E.

RANGE IN CHARACTERISTICS: The mollic epipedon is 61 to 91 centimeters thick and includes the upper part of the argillic horizon. Martin soils generally do not have free carbonates; however some pedons contain a few small carbonate concretions in the lower part of the B and C horizons.
Depth to shale or clay beds is greater than 102 centimeters.

A horizon:
Hue: 10YR
Value: 2 or 3 and 3 or 4 dry
Chroma: 1 or 2
Texture: silty clay loam, silty clay, and clay loam
Clay content: 28 to 45
Reaction: moderately or slightly acid

Bt horizon:
Hue: 10YR or 2.5Y
Value: 2 to 4 and 3 to 5 dry
Chroma: 1 or 2 (upper part), 1 to 4 (lower part)
Texture: clay or silty clay
Clay content: 40 to 55 percent
Reaction: moderately acid to slightly alkaline
Iron accumulations are few and distinct (upper part) and become common and prominent
(lower part). They are strong brown, reddish brown, and yellowish brown.

C horizon:
Hue: 5YR to 2.5Y
Value: 3 to 5
Chroma: 1 to 6
Color is usually variegated
Texture: clay, silty clay or silty clay loam
Clay content: 38 to 50
Reaction: neutral or slightly alkaline

COMPETING SERIES: These are the Adair, Arisburg, Arispe, Chase, Good Thunder
Greenton, Grundy, Lagonda, Lamoni, Macksburg, Mahaska, Mayberry, Seymour,
Shorewood, Tina, and Wymore soils. All of these soils except the Chase, Macksburg, and Tina soils have mollic epipedons less than 61 centimeters thick. Chase soils have mollic epipedons greater than 91 centimeters thick.
Macksburg soils contain 36 to 42 percent clay in the series control section. Tina soils are more acid in the lower part.

GEOGRAPHIC SETTING:
Parent Material: colluvium and/or residuum from interbedded silty and clayey shales, limestone, and clay bedsLandform: nearly level to sloping landscape below limestone outcrops, but some areas are above such outcrops
Slopes: 0 to 12 percent (gently concave to convex)
Mean annual temperature: 13 to 14 degrees C (55 to 58 degrees F)
Mean annual precipitation: 86 to 102 centimeters
Thornthwaite Annual PE Index: 54 to 70

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clime, Elmont,
Ladysmith, Sogn, Vinland, and Wamego soils. The Clime and Wamego soils have a
paralithic contact at a depth of 51 to 102 centimeters and are generally on slopes above the Martin soils.
Elmont soils are fine-silty and occur on similar landscape position as the
Martin soils.
The Ladysmith soils have a slightly drier soil moisture control section during the summer months. They occur on ridgetops above the Martin soils.
The shallow Sogn and Vinland soils do not have argillic horizons. They generally occur on slopes above the Martin soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: moderately well drained
Saturated hydraulic conductivity: slow

USE AND VEGETATION: Mostly cultivated with corn, wheat, soybeans, sorghums, alfalfa, and clover being the principal crops. Native vegetation is mixed tall and mid native prairie grasses.

DISTRIBUTION AND EXTENT: East central and northeastern Kansas; extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana

SERIES ESTABLISHED: Shawnee County, Kansas, 1970.

REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to a depth of about 71 centimeters (Ap, BA, and Bt1 horizons); argillic horizon - the zone from 36 to 94 centimeters (Bt1 and Bt2 horizons); other - aquic conditions - chroma of 2 or less and iron accumulations at 36 centimeters.

09/2008 GJJ added metric conversions, removed English units, and made some format changes.

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National Cooperative Soil Survey
U.S.A.