Nebraska Soils Field Trip - Virginia Tech

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4th IUSS Soil Classification Conference <strong>Field</strong> Tour Guidebook LOCATION JUDSON IA+KS MN MO NE WI Established Series Rev. JCR-RAL-TWN 10/2008 JUDSON SERIES The Judson series consists of very deep, well drained soils formed in silty colluvium derived from non-calcareous loess. These soils are on foot slopes, upland drainageways, and alluvial fans. Slope ranges from 0 to 12 percent. Mean annual air temperature is about 10 degrees C. Mean annual precipitation is about 810 millimeters. TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Cumulic Hapludolls TYPICAL PEDON: Judson silty clay loam, on a south-facing slope of 4 percent, in a cultivated field. (Colors are for moist soil unless otherwise stated.) Ap--0 to 23 centimeters; black (10YR 2/1) silty clay loam, very dark gray (10YR 3/1) dry, very dark grayish brown (10YR 3/2) kneaded; weak medium granular structure, friable; slightly acid; abrupt smooth boundary. A1--23 to 38 centimeters; very dark brown (10YR 2/2) silty clay loam, very dark grayish brown (10YR 3/2) dry, very dark grayish brown (10YR 3/2) kneaded; weak fine granular and weak very fine subangular blocky structure; friable; slightly acid; gradual smooth boundary. A2--38 to 56 centimeters; very dark brown (10YR 2/2) silty clay loam, very dark grayish brown (10YR 3/2) dry, very dark grayish brown (10YR 3/2) kneaded; weak very fine subangular blocky structure; friable; slightly acid; gradual smooth boundary. (Combined thickness of the A horizon is 50 to 75 centimeters.) AB--56 to 71 centimeters; very dark grayish brown (10YR 3/2) silty clay loam, grayish brown (10YR 5/2) dry, dark brown (10YR 3/3) kneaded; moderate fine subangular blocky structure; friable; many tubular pores; moderately acid; gradual smooth boundary. (10 to 25 centimeters thick) Bt--71 to 89 centimeters; dark brown (10YR 3/3) silty clay loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) kneaded; moderate medium subangular blocky structure; friable; many tubular pores; common very dark grayish brown (10YR 3/2) organoargillans on faces of peds; very few clay films; slightly acid; gradual smooth boundary. (15 to 100 centimeters thick) BC--89 to 132 centimeters; brown (10YR 4/3) silty clay loam; yellowish brown (10YR 5/4) kneaded; weak coarse subangular blocky structure; friable; many tubular pores; few very dark gray (10YR 3/1) stains on root channels; few fine faint grayish brown (10YR 5/2) redoximorphic 162
4th IUSS Soil Classification Conference <strong>Field</strong> Tour Guidebook depletions; few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; slightly acid; gradual smooth boundary. (15 to 50 centimeters thick) C--132 to 152 centimeters; brown (10YR 4/3) silty clay loam; massive; friable; few fine dark oxides; few fine faint grayish brown (10YR 5/2) redoximorphic depletions; common fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; slightly acid. TYPE LOCATION: Major Land Resource Area (MLRA) 108D-Illinois and Iowa Deep Loess and Drift, Western Part, Madison County, Iowa subset; about 7 miles north and 3 miles east of Winterset; located about 2,000 feet south and 300 feet west of the northeast corner of section 33, T. 77 N., R. 27 W.; USGS Saint Charles NW topographic quadrangle; lat. 41 degrees 25 minutes 34 seconds N. and long. 93 degrees 57 minutes 22 seconds W., NAD 83. RANGE IN CHARACTERISTICS: Thickness of the mollic epipedon--80 to 150 centimeters Depth to carbonates--more than 150 centimeters Clay content in the particle-size control section (weighted average)--30 to 35 percent Sand content in the particle-size control section (weighted average)--1 to 10 percent fine sand and sand coarser than fine sand Ap or A horizon: Hue--10YR Value--2 or 3 Chroma--1 or 2 Texture--silty clay loam or silt loam Clay content--24 to 32 percent Sand content--1 to 10 percent Reaction--very strongly acid to neutral AB horizon: Hue--10YR Value--2 or 3 Chroma--2 Texture--silty clay loam Clay content--27 to 32 percent Sand content--1 to 10 percent Reaction--moderately acid to neutral Bt or Bw horizon: Hue--10YR Value--3 to 5 Chroma--3 to 5 Texture--silty clay loam Clay content--30 to 35 percent Sand content--1 to 10 percent Reaction--moderately acid to neutral 163
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Nebraska Soils Field Trip - Virginia Tech

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