LOCATION LAGONOT IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Aquic Calcixerolls
TYPICAL PEDON: Lagonot silt loam--on a 1 percent slope under native pasture at an elevation of 4,415 feet--rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 3 inches; grayish brown (2.5Y 5/2) silt loam, very dark grayish brown (2.5Y 3/2) moist; moderate fine platy structure; hard, very friable, nonsticky and slightly plastic; many fine and very fine roots; common medium and many fine and very fine tubular pores; strongly effervescent; strongly alkaline (pH 8.6); abrupt smooth boundary. (3 to 9 inches thick)
A2--3 to 10 inches; grayish brown (2.5Y 5/2) silt loam, very dark grayish brown (2.5Y 3/2) moist; weak medium and fine subangular blocky structure; hard, very friable, nonsticky and slightly plastic; few medium and common fine and very fine roots; common fine and many very fine tubular pores; slightly effervescent; moderately alkaline (pH 8.4); clear smooth boundary. (7 to 10 inches thick)
Bk1--10 to 19 inches; light brownish gray (2.5Y 6/2) silt loam, dark grayish brown (2.5Y 4/2) moist; moderate fine subangular blocky structure; hard, very friable, slightly sticky and slightly plastic; common medium and many fine and very fine roots; few medium and many fine and very fine tubular pores; strongly effervescent; moderately alkaline (pH 8.4); clear wavy boundary. (9 to 20 inches thick)
Bk2--19 to 34 inches; light gray (2.5Y 7/2) silt loam, light brownish gray (2.5Y 6/2) moist; massive; hard, very friable, nonsticky and slightly plastic; few fine and very fine roots; common medium and many fine and very fine tubular pores; common fine faint pale brown (10YR 6/3) masses of iron accumulation; violently effervescent; strongly alkaline (pH 8.6); clear wavy boundary. (7 to 17 inches thick)
Bk3--34 to 60 inches; pale yellow (2.5Y 8/2) silt loam, light brownish gray (2.5Y 6/2) moist; massive; hard, very friable, slightly sticky and slightly plastic; few fine and very fine roots; common medium and many very and fine tubular pores; many fine distinct pale brown (10YR 6/3) masses of iron accumulation; violently effervescent; strongly alkaline (pH 8.6).
TYPE LOCATION: Oneida County, Idaho; about 4 miles west and 2 miles south of Malad City; approximately 300 feet north and 1,450 feet east of the southwest corner of section 6, T. 15 S., R. 36 E.; USGS Malad City West 7.5 minute topographic quadrangle; 42 degrees 08 minutes 33 seconds north latitude and 112 degrees 18 minutes 04 seconds west longitude, NAD83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 47 to 49 degrees F.
Mean summer soil temperature - 65 to 69 degrees F.
Mollic epipedon thickness - 10 to 19 inches.
Depth to calcic horizon - 10 to 19 inches.
Depth to redoximorphic features - 19 to 30 inches.
Particle-size control section - Clay content: 18 to 24 percent.
A horizon
Hue: 10YR or 2.5Y.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3, dry or moist.
Calcium carbonate equivalent: 5 to 15 percent.
Reaction: Slightly alkaline through strongly alkaline.
Bk horizons
Hue: 10YR or 2.5Y.
Value: 6 through 8 dry, 4 through 6 moist.
Chroma: 2 or 3, dry or moist.
Calcium carbonate equivalent: 15 to 35 percent.
Reaction: Moderately alkaline through very strongly alkaline.
COMPETING SERIES: This is the Rices series. Rices soils have more than 24 percent clay in the particle-size control section.
GEOGRAPHIC SETTING: Lagonot soils are on flood plains. They formed in alluvium derived from mixed sources. Slopes are 0 to 3 percent. Elevations range from 4,300 to 4,700 feet. The mean annual precipitation is 12 to 14 inches, the mean annual air temperature is 45 to 47 degrees F., and the frost-free period is 100 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Brinnum, Logan, and Langless soils. All of these soils have aquic soil moisture regimes. Brinnum soils also have ochric epipedons and are located in swales of flood plains. Logan soils are located in active stream drainages. Langless soils also have more than 40 percent calcium carbonate equivalent and are positioned on poorly drained areas of the flood plain.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; low surface runoff; moderate permeability (moderately high or high saturated hydraulic conductivity). Endosaturation is present with an apparent seasonal high water table between 1.5 and 3.5 feet (shallow or moderately deep free water occurrence classes) between October and June. Cumulative annual duration class is Persistent. These soils are susceptible to rare flooding for very brief periods year-round.
USE AND VEGETATION: Lagonot soils are used for irrigated cropland, hayland, and pastureland.
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: Oneida County, Idaho, 1994. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 10 inches (A1 and A2 horizons).
Calcic horizon - The zone from 10 to 60 inches (Bk1, Bk2, and Bk3 horizons).
Endosaturation feature - The condition of ground water with an upper boundary between 18 and 40 inches at certain times during normal years (parts of the Bk1, Bk2, and Bk3 horizons).
Particle-size control section - The zone from 10 to 40 inches (Bk1 and Bk2 horizons and part of the Bk3 horizon).
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data.