LOCATION NABB IN

Established Series
Rev. BGN
11/2021

NABB SERIES

The Nabb series consists of very deep, moderately well drained soils that formed in loess and the underlying paleosol in till. They are moderately deep to a fragipan. Nabb soils are on till plains. Slope ranges from 0 to 6 percent. Mean annual precipitation is about 1092 mm (43 inches), and mean annual temperature is about 12 degrees C (54 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, active, mesic Aquic Fragiudalfs

TYPICAL PEDON: Nabb silt loam, on a convex, 3 percent slope in a cultivated field at an elevation of about 181 meters (595 feet) above MSL. (Colors are for moist conditions unless stated otherwise.)

Ap--0 to 18 cm (0 to 7 inches); 75 percent dark yellowish brown (10YR 4/4) and 25 percent brownish yellow (10YR 6/6) silt loam, very pale brown (10YR 7/3) dry; moderate fine granular structure; friable; common very fine roots; few fine distinct spherical black (10YR 2/1) iron-manganese concretions; strongly acid; abrupt smooth boundary. [15 to 25 cm (6 to 10 inches) thick]

BE--18 to 33 cm (7 to 13 inches); brownish yellow (10YR 6/6) silt loam; weak medium subangular blocky structure; friable; common very fine roots; few distinct very pale brown (10YR 7/3) silt coatings on faces of peds; common fine prominent spherical black (10YR 2/1) iron-manganese concretions; very strongly acid; clear wavy boundary. [10 to 20 cm (4 to 8 inches) thick]

Bt--33 to 51 cm (13 to 20 inches); brownish yellow (10YR 6/6) silt loam; weak medium subangular blocky structure; friable; few very fine roots; few faint yellowish brown (10YR 5/6) clay films on faces of peds; common distinct light yellowish brown (10YR 6/4) silt coatings on faces of peds; common fine prominent spherical black (10YR 2/1) iron-manganese concretions; few fine prominent light gray (10YR 7/2) iron depletions in the matrix; very strongly acid; clear wavy boundary. [13 to 23 cm (5 to 9 inches) thick]

Bt/BE--51 to 84 cm (20 to 33 inches); 65 percent yellowish brown (10YR 5/4) silty clay loam (Bt); moderate medium prismatic structure parting to moderate coarse subangular blocky; firm; few very fine roots; many distinct light brownish gray (10YR 6/2) and brown (10YR 5/3) clay films on faces of peds; many distinct pale brown (10YR 6/3) clay depletions on faces of peds; common fine distinct spherical black (10YR 2/1) iron-manganese concretions; common fine distinct light brownish gray (10YR 6/2) iron depletions in the matrix; 35 percent light yellowish brown (10YR 6/4) silt loam (BE) krotovinas and fillings of former root channels; weak fine subangular blocky structure; friable; few very fine roots; very strongly acid; gradual wavy boundary. [25 to 36 cm (10 to 14 inches) thick]

2Btx/Bt--84 to 135 cm (33 to 53 inches); 65 percent yellowish brown (10YR 5/8) silt loam (Btx); moderate very coarse prismatic structure parting to weak very thick platy; very firm; common prominent gray (10YR 6/1) clay films on faces of vertical peds; 35 percent yellowish brown (10YR 5/6) silt loam (Bt); weak medium subangular blocky structure; friable; common fine prominent light gray (10YR 7/2) iron depletions in the matrix; in both parts of horizon, few fine prominent spherical black (10YR 2/1) iron-manganese concretions; 1 percent fine and medium gravel; 65 percent brittle; very strongly acid; gradual wavy boundary. (46 to 61 cm or 18 to 24 inches thick)

2Btx--135 to 180 cm (53 to 71 inches); yellowish brown (10YR 5/8) silt loam; moderate very coarse prismatic structure; firm; few prominent gray (10YR 6/1) clay films on faces of peds; few fine prominent spherical black (10YR 2/1) iron-manganese concretions; common medium prominent light brownish gray (10YR 6/2) iron depletions in the matrix; 1 percent fine and medium gravel; 75 percent brittle; very strongly acid; diffuse wavy boundary. [41 to 51 cm (16 to 20 inches) thick]

3Btb--180 to 203 cm (71 to 80 inches); strong brown (7.5YR 5/8) clay loam; moderate coarse subangular blocky structure; firm; common prominent gray (10YR 5/1) clay films on faces of peds; common medium prominent irregular black (10YR 2/1) iron-manganese concretions; common medium prominent gray (10YR 6/1) iron depletions in the matrix; 8 percent gravel; moderately acid.

TYPE LOCATION: Scott County, Indiana; 1,190 feet west and 830 feet south of the center of sec. 21, T. 4 N., R. 7 E.; USGS Crothersville, Indiana topographic quadrangle; lat. 38 degrees 46 minutes 12.162 seconds N. and long. 085 degrees 45 minutes 10.932 seconds W.; UTM Zone 16, 608328 easting and 4291998 northing, NAD 83.

RANGE IN CHARACTERISTICS:
Thickness of the loess: 152 to 229 cm (60 to 90 inches)
Depth to the top of the fragipan: 61 to 102 cm (24 to 40 inches)
Depth to the base of the argillic horizon: more than 203 cm (80 inches)
Particle-size control section: averages 20 to 30 percent clay and 10 to 18 percent sand (less than 15 percent fine and coarser sand)

Ap horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 3 or 4
Texture: silt loam
Reaction: very strongly acid to neutral

A horizon:
Hue: 10YR
Value: 3 or 4
Chroma: 3 or 4
Texture: silt loam
Reaction: very strongly acid or strongly acid

BE or EB horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 3 to 6
Texture: silt loam
Clay content: 14 to 22 percent
Sand content: 10 to 22 percent
Reaction: very strongly acid or strongly acid, and ranges to neutral in limed areas

Bt or Bt/BE horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 4 to 6
Texture: silt loam or silty clay loam in Bt part, silt loam in BE part
Clay content: 20 to 30 percent
Sand content: 10 to 18 percent
Reaction: extremely acid to strongly acid

2Btx/Bt or 2Btx horizon:
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 4 to 8
Texture: silt loam, and less commonly silty clay loam
Clay content: 18 to 28 percent
Sand content: 16 to 30 percent
Rock fragment content: 1 to 2 percent fine or medium gravel
Reaction: extremely acid to strongly acid

3Btb horizon:
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 6 to 8 or less commonly chroma of 2 with a hue of 10YR and value of 6
Texture: commonly clay loam and less commonly loam
Clay content: 24 to 38 percent clay
Sand content: 26 to 40 percent
Rock fragment content: 4 to 10 percent gravel
Reaction: strongly acid to neutral

COMPETING SERIES: These are the Boston, Chalfont, Gudgel, Haubstadt, Pierpont, Plumfield, Robbs, Sciotoville and Shakamak series. Boston soils have limestone rock fragments in the lower part of the series control section. Chalfont, Gudgel, Pierpont, Robbs, and Sciotoville soils are less than 203 cm (80 inches) to the base of the argillic horizon. Haubstadt soils compete very closely, but they are on water deposited landforms, and typically have horizons with less than 50 percent silt in the 2Bt and 2Btx horizons. Plumfield soils are less than 61 cm (24 inches) to the top of the fragipan. Shakamak soils average less than 10 percent sand in the Bt horizon.

GEOGRAPHIC SETTING: Nabb soils are on summits, shoulders and backslopes of loess-covered till plains. Slope ranges from 0 to 6 percent. Nabb soils formed in 152 to 229 cm (60 to 90 inches) of loess and the underlying paleosol in Illinoian age till. The upper 51 to 102 cm (20 to 40 inches) of the loess averages from 10 to 18 percent sand, and the lower part averages from 18 to 25 percent. The lower loess has been called "gritty loess". Mean annual precipitation ranges from 1016 to 1168 mm (40 to 46 inches). Mean annual air temperature ranges from 11 to 14 degrees C (51 to 57 degrees F). Frost-free period is 160 to 190 days. Elevation is 183 to 305 meters (600 to 1000 feet) above mean sea level.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Avonburg, Blocher, Bonnell, Cincinnati, Cobbsfork, Hickory and Jennings soils. The somewhat poorly drained Avonburg soils and the poorly drained Cobbsfork soils are on nearly level summits and flats. The well drained Bonnell and Hickory soils are on more sloping shoulders and backslopes. The moderately well drained Blocher soils and the well drained Cincinnati soils do not have iron depletions in the upper 25 cm (10 inches) of the argillic horizon. The moderately well drained Jennings soils have the lower part of the solum formed in residuum from black shale bedrock. Blocher soils are on shoulders and backslopes. Cincinnati and Jennings soils are on similar landform positions as the Nabb soils, but typically are on lower lying backslopes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained. The depth to the top of a perched seasonal high water table ranges from 46 to 61 cm (1.5 to 2 feet) between December and April in normal years. The potential for surface water runoff is medium. Saturated hydraulic conductivity is moderately high or high above the fragipan and low to moderately high in the fragipan. Permeability is moderate above the fragipan and slow or very slow in the fragipan.

USE AND VEGETATION: Most areas are being used to grow corn and soybeans. A few areas are used for small grain, mainly wheat, and for hay or pasture. Also a few areas are in woodland. Native vegetation is mixed hardwood trees.

DISTRIBUTION AND EXTENT: MLRA 114A in Indiana. This series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: AMHERST, MASSACHUSETTS

SERIES ESTABLISHED: Scott County, Indiana, 1995

REMARKS: Nabb soils are correlated in lieu of the Rossmoyne soils as subset surveys are updated in Indiana, because the depth to till is more than 102 cm (40 inches) which is outside the Rossmoyne series concept. In addition, Rossmoyne soils have a higher CEC activity class.

Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 to 18 cm (7 inches) (Ap horizon).
Argillic horizon: 33 to 203 cm (13 to 80 inches) (Bt, Bt/EB, 2Btx/Bt, 2Btx, 3Btb horizons).
Fragipan: 84 to 180 cm (33 to 71 inches) (2Btx/Bt, 2Btx horizons).
Redoximorphic features: present in all horizons between 33 and 203 cm (13 and 80 inches).

ADDITIONAL DATA: Lab data: Agricultural Experiment Station, Purdue University, Station Bulletin No. 174, File No. JE7004; Station Bulletin No. 222, File No. JF7601; Station Bulletin No. 274, File No. RI7807; Station Bulletin No. 412, File No. JN8009; Station Bulletin No. 451, File No.'s FR8108 and
SW8107. National Soil Survey Lab, Lincoln, NE: S86IN143-6 (typical pedon) and S92IN77-2.

National Cooperative Soil Survey
U.S.A.