LOCATION LANDO IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Oxyaquic Calcixerolls
TYPICAL PEDON: Lando silt loam--on a 1 percent slope at 4,940 feet--irrigated pasture. (Colors are for dry soil unless otherwise noted. When described on August 16, 1988, the soil was dry to 40 inches and moist below.)
Ap--0 to 5 inches; dark gray (10YR 4/1) silt loam, very dark brown (10YR 2/2) moist; weak thick platy structure; slightly hard, friable, moderately sticky and slightly plastic; many very fine and fine and few medium roots; common very fine and fine tubular pores; strongly effervescent; 1 percent gravel; slightly alkaline (pH 7.8); clear smooth boundary. (3 to 6 inches thick)
AB--5 to 14 inches; dark gray (10YR 4/1) silty clay loam, very dark brown (10YR 2/2) moist; moderate very fine and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and fine and few medium roots; common very fine tubular pores; slightly effervescent; slightly alkaline (pH 7.6); gradual wavy boundary. (6 to 10 inches thick)
Bk1--14 to 23 inches; gray (10YR 5/1) silty clay loam, very dark gray (10YR 3/1) moist; moderate very fine and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and few fine roots; common very fine tubular pores; strongly effervescent; few fine irregular carbonate filaments and masses; slightly alkaline (pH 7.6); gradual wavy boundary. (8 to 10 inches thick)
Bk2--23 to 33 inches; gray (10YR 5/1) silty clay loam, very dark gray (10YR 3/1) moist; moderate very fine and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and few fine roots; common very fine and few fine and medium tubular pores; strongly effervescent; common fine irregular carbonate filaments and masses; slightly alkaline (pH 7.8); gradual wavy boundary. (8 to 10 inches thick)
Bkg1--33 to 50 inches; gray (5Y 6/1) silty clay loam, very dark gray (5Y 3/1) moist; weak fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; common very fine and few fine tubular pores; violently effervescent; many fine and medium irregular carbonate filaments and masses; slightly alkaline (pH 7.8); gradual wavy boundary. (16 to 21 inches thick)
Bkg2--50 to 60 inches; gray (5Y 6/1) silty clay loam, dark gray (5Y 4/1) moist; weak fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine and few fine tubular pores; few fine prominent light olive brown (2.5Y 5/4) masses of iron accumulation; violently effervescent; common fine and medium irregular carbonate filaments and masses; moderately alkaline (pH 8.0).
TYPE LOCATION: Franklin County, Idaho; about 4 miles west of Weston; approximately 2,350 feet east and 50 feet north of the southwest corner of section 5, T. 16 S., R. 38 E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 47 to 50 degrees F.
Mollic epipedon thickness - 30 to 60 inches; includes Bk1 and Bk2 horizons.
Depth to calcic horizon - 9 to 16 inches.
Particle-size control section - Clay content: Averages 27 to 35 percent; Rock fragments: 0 to 6 percent gravel.
Ap and AB horizons
Value: 3 through 5 dry, 2 or 3 moist.
Chroma: 1 through 3, dry or moist.
Organic matter content: 1 to 3 percent.
Bk horizons
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 1 through 3 dry or moist.
Organic matter content: 1 or 2 percent.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent: 15 to 30 percent.
Bkg horizon
Hue: 10YR through 5Y.
Value: 5 through 7 dry, 3 or 4 moist.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent: 15 to 30 percent.
COMPETING SERIES: This is the Greenson series. Greenson soils have mollic epipedons that are 11 to 19 inches thick.
GEOGRAPHIC SETTING: Lando soils are on stream terraces. They formed in alluvium derived from mixed sources. Slopes are 0 to 4 percent. Elevations range from 4,500 to 5,200 feet. The mean annual precipitation is 14 to 18 inches, the mean annual air temperature is 45 to 48 degrees F., and the frost-free period is 100 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Collinston and Parleys soils. Collinston and Parleys soils have mollic epipedons less than 20 inches thick.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; medium surface runoff; slow permeability (moderately low or moderately high saturated hydraulic conductivity). Endosaturation is present with an apparent seasonal high water table between 2 and 4 feet (moderately deep or deep free water occurrence classes) between February and April. Cumulative annual duration class is Common.
USE AND VEGETATION: Lando soils are used mainly for alfalfa and small grains.
DISTRIBUTION AND EXTENT: Southeastern Idaho. These soils are not extensive with about 2,600 acres of the series mapped to date. MLRA 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Franklin County, Idaho, 1997. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 33 inches (Ap, AB, Bk1, and Bk2 horizons).
Calcic horizon - The zone from 14 to 60 inches (Bk1, Bk2, Bkg1, and Bkg2 horizons).
Endosaturation feature - The condition of ground water with an upper boundary between 24 and 48 inches at certain times during normal years (parts of the Bk2 and Bkg1 horizons).
Particle-size control section - The zone from 10 to 40 inches (Bk1 and Bk2 horizons and parts of the AB and Bkg1 horizons).
The cation exchange activity class is an estimate based on soil properties in NASIS data elements. The soil is not classified in the aquic subgroup of Calcixerolls because the pedon lacks redox concentrations within 75 centimeters of the mineral soil surface.