LOCATION SILVER CREEK NE+SDEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Typic Natraquolls
TYPICAL PEDON: Silver Creek silt loam, with a slope of less than 1 percent in a cultivated field. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 18 centimeters (0 to 7 inches); very dark gray (10YR 3/1) silt loam, black (10YR 2/1) moist; weak medium granular structure; slightly hard, very friable; neutral; abrupt smooth boundary.
A--18 to 25 centimeters (7 to 10 inches); very dark gray (10YR 3/1) silt loam, black (10YR 2/1) moist; moderate medium granular structure; slightly hard, very friable; slight effervescence; slightly alkaline; clear smooth boundary. (0 to 8 inches thick) (Combined thickness of the A horizon is 15 to 25 centimeters (6 to 18 inches) thick)
Bt1--25 to 36 centimeters (10 to 14 inches); very dark gray (10YR 3/1) silty clay loam, black (10YR 2/1) moist; moderate medium columnar structure parting to moderate medium subangular blocky; hard, firm; strong effervescence; moderately alkaline; clear wavy boundary.
Bt2--36 to 53 centimeters (14 to 21 inches); dark gray (2.5Y 4/1) silty clay, black (10YR 2/1) moist; moderate medium columnar structure parting to moderate medium blocky; hard, firm; violent effervescence; streaks and soft masses of lime; moderately alkaline; clear wavy boundary.
Btk--53 to 69 centimeters (21 to 27 inches); gray (2.5Y 5/1) silty clay, dark gray (2.5Y 4/1) moist; moderate medium prismatic structure parting to weak medium subangular blocky; hard, firm; violent effervescence; streaks and soft masses of lime; moderately alkaline; clear wavy boundary. (Combined thickness of Bt horizons is 30 to 61 centimeters (12 to 24 inches) thick)
BCk--69 to 97 centimeters (27 to 38 inches); gray (2.5Y 6/1) silt loam, gray (2.5Y 5/1) moist; weak coarse subangular blocky structure; slightly hard, very friable; violent effervescence; streaks and soft masses of lime; moderately alkaline; abrupt wavy boundary. (0 to 28 centimeters (0 to 11 inches) thick)
C1--97 to 107 centimeters (38 to 42 inches); light olive gray (5Y 6/2) fine sandy loam, olive gray (5Y 5/2) moist; common medium distinct light olive brown (2.5Y 5/6) moist iron masses in the soil matrix; massive; slightly hard, very friable; moderately alkaline; abrupt smooth boundary. (8 to 25 centimeters (3 to 10 inches) thick)
C2--107 to 203 centimeters (42 to 80 inches); light olive gray (5Y 6/2) loamy fine sand, light olive gray (5Y 6/2) moist; common coarse distinct light olive brown (2.5Y 5/6) moist iron masses in the soil matrix; single grain; soft, loose; moderately alkaline.
TYPE LOCATION: Buffalo County, Nebraska; 2.4 kilometers (1 1/2 miles) south and 2.4 kilometers (1 1/2 miles) east of Gibbon; 338 meters (1,110 feet) south and 46 meters (150 feet) east of the northwest corner, sec. 29, T. 9 N., R. 13 W.
RANGE IN CHARACTERISTICS:
Soil moisture control section: moist in some part from October to April; intermittently moist from May to July; driest in July to September;
Moisture regime: ustic
Secondary carbonates: with in a depth of 25 centimeters (10 inches); in places, carbonates are at the surface
Depth to redoximorphic features: about 69 centimeters (27 inches) to a depth of 203 centimeters (80 inches) are distinct or prominent iron masses
Depth to endosaturation: seasonal highs 61 to 122 centimeters (2 and 4 feet)
Thickness of the mollic epipedon: 18 to 61 centimeters (7 to 24 inches); includes the A horizon and the upper part of the B horizon
Thickness of the solum: 46 to 107 centimeters (18 to 42 inches)
A horizon:
Hue: 10YR or 2.5Y
Value: 3 or 4, 2 or 3 moist
Chroma: 1 or 2
Texture: silt loam or silty clay loam
Reaction: neutral or slightly alkaline
Bt horizon:
Hue: 10YR or 2.5Y
Value: 3 to 5, 2 to 4 moist
Chroma: 1 or less
Texture: heavy silty clay loam to silty clay
Clay content: 35 to 48 percent
Reaction: moderately alkaline
Exchangeable Sodium: 15 to 24 percent with a small amount of other soluble salts.
Comment: Streaks and soft masses of lime are in the lower part
BCk and C horizons:
Hue: 2.5Y or 5Y
Value: 5 to 7, 3 to 6 moist
Chroma: 1 or 2
Reaction: moderately or strongly alkaline in the upper part and moderately alkaline in the lower part
COMPETING SERIES: There are no competing soils in this family.
GEOGRAPHIC SETTING:
Parent material: alluvium
Landform: high flood plains or low stream terraces
Slope: 0 to 2 percent
Mean annual precipitation: 46 to 66 centimeters (18 to 26 inches)
Mean annual temperature: 10 to 11 degrees C. (49 to 52 degrees F.)
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Gibbon,
Hall,
Hord,
Leshara,
Lamo,
Rusco, and
Wood River soils.
Gibbon soils occur above Silver Creek.
Hall and Hord soils are on Stream terraces, contain less clay, do not have a natric horizon, and free calcium carbonates are deeper.
Lamo and Leshara soils are on flood plains, do not have a natric horizon, are fine-silty, and Lamo soils have a thicker mollic epipedon.
Rusco soils are in depreesions, lack a natric horizon and are fine-silty.
Wood River soils on stream terraces.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: somewhat poorly drained
Runoff: low
Saturated hydraulic conductivity: low over moderately high
Depth to the seasonal high water table: 61 centimeters (2 feet) in wet seasons to 122 centimeters (4 feet) in dry seasons
Flooding: rare or occasional
USE AND VEGETATION: Most of the acreage is cultivated.
Principal crops are corn, sorghum, and alfalfa.
Many areas are irrigated.
The range is native grasses of big bluestem, indiangrass, prairie cordgrass, switchgrass, and little bluestem.
DISTRIBUTION AND EXTENT: Mainly along the Platte River in central Nebraska. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Hall County, Nebraska, 1959.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 36 centimeters (0 to 14 inches) (Ap, A, and Bt1 horizon)
Natric horizon: 25 to 69 centimeters (10 to 27 inches) (Bt1, Bt2 and Btk)
Aquic soil conditions: 97 to 203 centimeters (38 to 80 inches)
ADDITIONAL DATA: Physical and chemical data are provided for three profiles in Soil Survey Investigations Report No. 5, pages 176-181.
Modified format by LRM in 10/2005 to include metric conversion and change permeability to saturated hydraulic conductivity.