LOCATION NANNYTON IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Calciargids
TYPICAL PEDON: Nannyton fine gravelly sandy loam -- on a nearly level remnant fan at 2,425 feet elevation in rangeland (Colors are for air-dry soil unless otherwise noted.)
A1--0 to 2 inches; light brownish gray (10YR 6/2) fine gravelly sandy loam, dark grayish brown (10YR 4/2) when moist; weak, fine, granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; 20 percent gravel; slightly effervescent; strongly alkaline; abrupt broken boundary. (2 to 6 inches thick)
A2--2 to 7 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) when moist; moderate, thin and very thin platy structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine vesicular pores; 5 percent gravel; moderately alkaline; clear smooth boundary. (1 to 5 inches thick)
Bt--7 to 14 inches; light gray (10YR 7/2) clay loam, brown (10YR 5/3) when moist; weak, medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine and fine roots; many very fine tubular pores; faint patchy clay films on faces of peds; 5 percent gravel; moderately alkaline; abrupt wavy boundary. (4 to 10 inches thick)
Bk1--14 to 17 inches; light gray (10YR 7/2) loam, yellowish brown (10YR 5/4) when moist; weak, medium, subangular blocky structure; slightly hard, very friable, moderately sticky and slightly plastic; many fine and very fine roots; common very fine tubular pores; 5 percent gravel; slightly effervescent; moderately alkaline; clear wavy boundary. (2 to 7 inches thick)
Bk2--17 to 23 inches; very pale brown (10YR 8/3) fine sandy loam, pale brown (10YR 6/3) when moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; many fine and medium roots; few fine tubular pores; 5 percent gravel; strongly effervescent; moderately alkaline; clear smooth boundary. (5 to 8 inches thick)
2Bk3--23 to 27 inches; very pale brown (10YR 8/3) gravelly coarse sandy loam, light yellowish brown (10YR 6/4) when moist; massive; slightly hard, very friable, nonsticky and nonplastic; many fine and very fine roots; 25 percent gravel; strongly effervescent; moderately alkaline; clear smooth boundary. (0 to 12 inches thick)
2Bk4--27 to 39 inches; very pale brown (10YR 8/3) gravelly loamy coarse sand, dark yellowish brown (10YR 3/4) when moist; massive; soft, very friable, nonsticky and nonplastic; few fine roots; 30 percent gravel; strongly effervescent; moderately alkaline; smooth boundary. (0 to 20 inches thick)
3Bk5--39 to 60 inches; grayish-brown (10YR 5/2) fine sand and fine gravel, brown (10YR 4/3) when moist in the fine or matrix portion; much black basalt and other dark minerals in fine gravel and sand; single grain; loose; few fine roots; slightly effervescent; moderately alkaline.
TYPE LOCATION: Owyhee County, Idaho; about 16 miles southeast of Marsing; 1,730 feet west and 1,100 feet north of the southeast corner of section 13, T. 1S., R. 3W. (Latitude - 43 degrees, 19 minutes, 52 seconds N. and Longitude - 116 degrees, 38 minutes, 08 seconds W.)
RANGE IN CHARACTERISTICS:
Average annual soil temperature is 55 to 56 degrees F.
Depth to the calcic horizon - 7 to 20 inches
Depth to bedrock - greater than 60 inches
Particle-size control section - 25 to 35 percent clay; 5 to 35 percent rock fragments
Moisture control section - dry for more than 180 days when the soil temperature is greater than 41 degrees F.
A horizon
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 or 3 dry or moist
Reaction - slightly or strongly alkaline
Bt horizon
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 or 3 dry or moist
Texture - CL, L
Clay - 25 to 35 percent
Rock fragments - 5 to 35 percent
Reaction - slightly or moderately alkaline
Bk horizons
Value - 5 through 8 dry, 3 through 6 moist
Chroma - 2 through 4 dry or moist
Texture - L, FSL, COSL, LCOS, FS
Clay - 0 t 18 percent
Rock fragments - 5 to 35 percent
Effervescence - slight to strong
COMPETING SERIES: These are the Cataract, Chattin (T), Grieta, Mack, Mesa, Neiber and Saddle series. Neiber and Saddle soils are 20 to 40 inches to a paralithic contact. Cataract soils are 20 to 40 inches to a lithic contact. Grieta soils are 20 to 40 inches to the calcic horizon. Chattin, Mack and Mesa soils lack sand and/or loamy sand textures above 40 inches.
GEOGRAPHIC SETTING: Nannyton soils are on level to moderately sloping alluvial fans and terraces at elevations of 2,300 to 2,500 feet. Slopes range from 0 to 8 percent. The soils formed in alluvium dominantly from rhyolitic, granitic, and basaltic sources. The climate is arid with very dry summers. Average annual precipitation is 6 to 9 inches, including a little snowfall. Average annual temperature is 53 to 54 degrees F. The frost-free period is 145 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Marsing and Vanderoff soils. These soils lack argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; very slow or slow runoff; moderately permeable.
USE AND VEGETATION: Mannyton soils are used for rangeland, irrigated cropland and pasture. Crops include corn, small grains and sugar beets. The natural vegetation is mainly shadscale, with some budsage, spiny hopsage, squirreltail, and horsebrush, and in places greasewood.
DISTRIBUTION AND EXTENT: Southwestern Idaho; MLRA 11. Not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Owyhee County, Idaho, 1973.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 7 inches. (A1 and A2 horizons)
Argillic horizon - the zone form 7 to 14 inches (Bt horizon)
Calcic horizon - the zone form 17 to 39 inches Bk2, 2Bk3 and 2Bk4 horizons)
Particle-size control section - 7 to 14 inches (Bt horizon)
Soil moisture regime - aridic
The classificaiton of this pedon has been revised as of 4/00 from fine-loamy, mixed, mesic Typic Haplargids to fine-loamy, mixed, superactive, mesic Typic Calciargids based on revision to Soil Taxonomy.