LOCATION HAMBURN NMEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, calcareous, mesic Typic Torrifluvents
TYPICAL PEDON: Hamburn clay loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; pale brown (10YR 6/3) clay loam, brown (10YR 4/3) moist; moderate medium platy structure parting to weak fine granular; slightly hard, friable, moderately sticky and moderately plastic; few fine and medium roots; strongly effervescent; moderately alkaline (pH 8.4); clear wavy boundary. (2 to 4 inches thick)
AC--3 to 9 inches; pale brown (10YR 6/3) sandy clay loam with few thin strata of silty clay loam, yellowish brown (10YR 5/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine and few medium and coarse roots; few thin strata of silty clay loam; strongly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (5 to 10 inches thick)
C--9 to 12 inches; pale brown (10YR 6/3) sandy clay loam with few thin strata of silty clay loam, brown (10YR 4/3) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; few thin strata of silty clay loam; strongly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (3 to 6 inches thick)
Cz--12 to 24 inches; brown (10YR 5/3) sandy clay loam with few thin strata of sandy loam, brown (10YR 4/3) moist; weak medium prismatic structure parting to weak medium subangular blocky; hard, firm, moderately sticky and moderately plastic; common very fine and few fine and medium roots; few thin strata of sandy loam; salt crystals segregated in few fine irregularly shaped seams; strongly effervescent; gypsum segregated in few fine irregularly shaped seams; strongly alkaline (pH 8.8); gradual smooth boundary. (6 to 16 inches thick)
Bzb1--24 to 33 inches; pale brown (10YR 6/3) sandy clay loam, brown (10YR 5/3) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and few fine roots; salt crystals segregated in common medium irregularly shaped seams and filaments; strongly effervescent; gypsum segregated in common medium irregularly shaped seams and filaments; strongly alkaline (pH 9.0); gradual smooth boundary. (6 to 11 inches thick)
Bzb2--33 to 40 inches; yellowish brown (10YR 5/4) sandy clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and few fine roots; salt crystals segregated in common fine and medium irregularly shaped seams and filaments; slightly effervescent; gypsum segregated in common fine and medium irregularly shaped seams and filaments, strongly alkaline; strongly alkaline (pH 9.0); clear wavy boundary. (0 to 7 inches thick)
Bzb3--40 to 52 inches; yellowish brown (10YR 5/4) sandy clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and few fine roots; salt crystals segregated in common fine and medium irregularly shaped seams and filaments; slightly effervescent; gypsum segregated in common fine and medium irregularly shaped seams and filaments; soluble salts segregated in few fine, irregularly shaped masses; strongly alkaline; strongly alkaline (pH 9.0); clear wavy boundary. (0 to 12 inches thick)
Bzb4--52 to 70 inches; yellowish brown (10YR 5/4) silty clay loam, dark yellowish brown (10YR 4/4) moist; weak coarse and moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; salt crystals segregated in common fine irregularly shaped seams and filaments; slightly effervescent; gypsum segregated in many fine and medium irregularly shaped seams and filaments; soluble salts segregated in few fine irregularly shaped soft masses; strongly alkaline (pH 8.6). (18 to 30 inches thick)
TYPE LOCATION: San Juan County, New Mexico; on the Navajo Indian Reservation about 8.5 miles northeast of Sheep Springs; 3,250 feet north and 2,400 feet east from the southwest corner of section 19, T. 22 N., R. 16 W.; Latitude 36 degrees 12 minutes 53 seconds N and Longitude 108 degrees 35 minutes 12 seconds W.
RANGE IN CHARACTERISTICS:
Soil Temperature: 52 to 57 degrees F.
Soil Moisture: The soil moisture control section is intermittently moist in some part of the soil moisture control section during December through March and July through September. The soil is driest during May and June. Typic aridic soil moisture regime.
Clay content average in the particle size control section: 27 to 35 percent
A horizon
Hue: 10YR, 2.5Y
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Salinity: 0 to 2 dS/m
Sodicity, SAR: 0 to 5
AC horizon
Hue: 10YR, 2.5Y
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture: sandy clay loam, sandy loam
Salinity: 2 to 4 dS/m
Sodicity, SAR: 5 to 13
C and Cz horizons
Hue: 10YR, 2.5Y
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture: sandy clay loam, clay loam
Salinity: 4 to 16 dS/m
Sodicity, SAR: 13 to 30
Gypsum content: 0 to 1 percent
Other features: thin strata of sandy loam, fine sandy loam, or silty clay loam are present
Bzb horizons
Hue: 10YR, 2.5Y
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture: clay loam, silty clay loam
Salinity: 4 to 25 dS/m
Sodicity, SAR: 13 to 45
Gypsum content: 0 to 1 percent
COMPETING SERIES: These are the Battlerock (CO), Binton (WY), Boyson (WY), Clayhook (AZ), Jocity (AZ), Lostwells (WY), Toddler (UT), and Youngston (WY) series. The Battlerock soils overlap the Hamburn soils and should be revaluated during the updates. The Binton, Boyson, Lostwells, Toddler, and Youngston soils have mean annual soil temperatures less than 52 degree F. and are moist in the soil moisture control section during May and June. Clayhole and Jocity soils have hues of 7.5YR and redder, in addition Jocity soils do not have accumulations of gypsum.
GEOGRAPHIC SETTING: Hamburn soils are on low relief flood plains and formed in alluvium and stream alluvium derived from shale and sandstone. Slopes are 0 to 3 percent. Elevation ranges from 5,200 to 6,000 feet. Annual precipitation is 5 to 10 inches, with 35 to 60 percent falling as rain from high-intensity thunderstorms between July and September. These soils receive an additional 2 to 5 inches of run-on moisture from flooding. The mean annual temperature is 50 to 55 degrees F. The frost-free period is 130 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Benally, Brimhall, Genats and Werito soils. Benally soils have natric horizons and occur on adjacent toeslopes. Brimhall soils are coarse-loamy, deep, and have calcic and gypsic horizons. Genats soils are moderately deep, fine textured, and occur on footslopes and backslopes. Werito soils are moderately deep, fine textured and have cambic horizons.
DRAINAGE AND PERMEABILITY: Well drained, runoff is low to medium. Permeability is moderately slow. These soils are subject to frequent, very brief periods of flooding between July and September.
USE AND VEGETATION: Hamburn soils are used for livestock grazing. Present vegetation is alkali sacaton, galleta and mound saltbush.
DISTRIBUTION AND EXTENT: Hamburn soils are of small extent in the western San Juan Basin portion of the Colorado Plateau province in northwest New Mexico. LRR-D; MLRA 35.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Shiprock Area, Parts of San Juan County, New Mexico and Apache County, Arizona; 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
The lack of a diagnostic epipedon or diagnostic subsurface horizons.
Ochric epipedon - the zone from 0 to 3 inches (A horizon)
Fluvent feature - an irregular decrease in organic carbon due to fine stratification.
The presence of buried B horizons within 40 inches of the soil surface.
Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Tenth Edition, 2006
Update and revisions for the competing series section. 2/08 DWD