LOCATION NAHODISH NM+AZEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Ustifluventic Haplocambids
TYPICAL PEDON: Nahodish silt loam--in degraded rangeland on a convex-linear slope of 1 percent at an elevation of 6,555 feet. (Colors are for dry soils unless otherwise noted.)
A--0 to 1 inches light olive brown (2.5Y 5/3) silt loam, olive brown (2.5Y 4/3) moist; thin surface crust; massive; soft, very friable, slightly sticky and slightly plastic; few very fine roots; slightly alkaline (pH 7.8); abrupt smooth boundary. (1 to 3 inches thick)
Bw1--1 to 9 inches; light olive brown (2.5Y 5/3) silty clay loam, olive brown (2.5Y 4/3) moist; weak fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and fine roots; few very fine irregular pores; slightly alkaline (pH 7.8) abrupt smooth boundary.
Bw2--9 to 17 inches; light olive brown (2.5Y 5/4) silty clay, olive brown (2.5Y 4/4) moist; weak fine and medium subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; many very fine and fine roots; common very fine irregular pores; few pressure faces and non-intersecting slickensides; very slightly effervescent; slightly alkaline (pH 7.8); gradual smooth boundary. (The combined thickness of the Bw horizons is 8 to 26 inches)
Bk1--17 to 31 inches; light olive brown (2.5Y 5/4) silty clay, olive brown (2.5Y 4/4) moist; weak fine and medium subangular block structure; very hard, firm, moderately sticky and moderately plastic; many very fine and fine roots; common very fine irregular pores; few pressure faces; few very fine masses of calcium carbonate; slightly effervescent; slightly alkaline (pH 7.8); abrupt smooth boundary.
Bk2--31 to 36 inches; light olive brown (2.5Y 5/4) clay loam, olive brown (2.5Y 4/4) moist; weak fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine roots; few very fine irregular pores; few very fine masses of calcium carbonate; very slightly effervescent; slightly alkaline (pH 7.8); abrupt smooth boundary.
Bk3--36 to 58 inches; light olive brown (2.5Y 5/4) silt loam, olive brown (2.5Y 4/4) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; few very fine strata of silt and very fine sand; few very fine masses of calcium carbonate. strongly effervescent; moderately alkaline (pH 8.0); abrupt smooth boundary. (The combined thickness of the Bk horizon is 0 to 50 inches)
Bky--58 to 70 inches; light olive brown (2.5Y 5/4) clay, olive brown (2.5Y 4/4) moist; massive; very hard, very firm, moderately sticky and moderately plastic; few very fine roots; few very fine masses of calcium carbonate and gypsum; slightly effervescent; strongly alkaline (pH 8.6). (12 to 40 inches thick)
TYPE LOCATION: McKinley County, New Mexico; Sampson Lake Quadrangle; about 6 miles west of Gamerco, New Mexico; about 200 feet east and 900 feet north of the southwest corner of section 25, R. 20 W. and T. 16 N.; 108 degrees 55 minutes 05 seconds west longitude, 35 degrees 34 minutes 50 seconds north latitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: The SMCS is usually dry, in all parts, 105 to 160 cumulative days from April through October. It is usually moist, in some part, 50 to 105 cumulative days during and June. Ustic aridic moisture regime.
Soil Temperature: 48 to 52 degrees F.
Particle-size control section: 35 to 50 percent clay on a weighted average with some horizons having as little as 30 percent clay
Depth to calcium carbonate: 10 to 30 inches
Percent calcium carbonate equivalent: less than 10 percent
Depth to gypsum accumulation: 21 to 58 inches
Percent gypsum: 0 to 1 percent in the upper horizons and 1 to 10 percent in the lower horizons
Salinity (mmhos/cm): 0 to 4
Sodicity (SAR): 0 to 10
Reaction: slightly to moderately alkaline
Other features: Thin stratification occurs in discontinuous pockets in some horizons. Also, some pedons are calcareous to the surface and have a Bss horizon.
A horizon
Value: 4 to 6 dry and 4 moist
Chroma: 2 or 3 dry and moist
Textures: silt loam or silty clay loam
Bw horizons
Value: 4 or 5 dry and moist
Chroma: 2 to 4 dry and moist
Textures: clay, silty clay loam, clay loam, or silty clay
Bk and Bky horizons
Value: 4 to 6 dry and 4 or 5 moist
Chroma: 3 or 4 dry or moist
Textures: clay, silty clay, silty clay loam, silt loam, or clay loam
COMPETING SERIES: There are no competitors.
GEOGRAPHIC SETTING: The Nahodish soils formed in alluvium and stream alluvium derived from shale. Nahodish soils are on valley floors. Slopes are 0 to 4 percent. Elevations range from 6,100 to 7,200 feet. The mean annual air temperature is 46 to 50 degrees F., and the mean annual precipitation is 10 to 13 inches. The frost free period is 100 to 135 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the fine textured Berryhill soils on stream terraces, the moderately fine textured Buckle soils on fan terraces and fan remnants of valley sides, the shallow Hospah soils on escarpments, and the occasionally flooded Sparank soils on flood plains.
DRAINAGE AND PERMEABILITY: Well drained, medium to high runoff, and slow to very slow permeability.
USE AND VEGETATION: This series is used for rangeland. Present vegetation is black greasewood, alkali sacaton, broom snakeweed and western wheatgrass.
DISTRIBUTION AND EXTENT: West central New Mexico; MLRAs 35 and 36, LRR-D. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: McKinley County Area, New Mexico; McKinley County and Parts of Cibola and San Juan Counties, 2001.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 1 inch. (A horizon)
Cambic horizon: The zone from 1 to 17 inches. (Bw1 and Bw2 horizons)
Ustifluventic feature: Aridic moisture regime bordering on ustic with an irregular decrease in organic carbon with depth
Cation exchange activity class was changed from active to superactive in December 2000.
Classified according to Soil Taxonomy Second Edition, 1999.
ADDITIONAL DATA: Salinity determined by salinity meter in the field office lab.