LOCATION NODMAN AZEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, thermic, shallow Ustic Haplargids
TYPICAL PEDON: Nodman gravelly sandy loam - rangeland. (Colors are for dry soil unless otherwise noted).
A--0 to 2 inches; light brown (7.5YR 6/4) gravelly sandy loam, brown (7.5YR 4/3) moist; weak medium platy structure parting to moderate very fine subangular blocky; soft, very friable, nonsticky and nonplastic; common very fine and fine and few medium roots; common very fine irregular pores; 30 percent gravel; noneffervescent; moderately acid (pH 5.8); abrupt smooth boundary. (1 to 3 inches thick)
Bt--2 to 10 inches; reddish yellow (7.5YR 6/6) very gravelly sandy clay loam, strong brown (7.5YR 5/6) moist; moderate fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine through medium roots; common very fine and fine irregular pores; few faint clay films bridging sand grains, common faint clay films lining pores and on faces of peds; 45 percent gravel; noneffervescent; moderately acid (pH 6.0); clear wavy boundary. (3 to 19 inches thick)
2Cr1--10 to 17 inches; highly weathered granite bedrock penetrated by roots; abrupt irregular boundary. (0 to 7 inches thick)
2Cr2--17 inches; fractured, slightly weathered granite bedrock.
TYPE LOCATION: Mohave County Arizona; about 3 miles southwest of Hackberry; about 1,600 feet south and 1,600 feet west of section 28, township 23 north, range 14 west; 35 degrees, 21 minutes, 3.6 seconds north latitude; 113 degrees, 46 minutes, 9.6 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: Intermittently moist in some part of the soil moisture control section during July through September. Driest during May and June. Ustic aridic soil moisture regime.
Soil Temperature: 59 to 69 degrees F.
Rock Fragments: averages 35 to 60 percent; less than 50 percent 2 to 5 millimeter gravel. Some very shallow pedons may have as much as 75 percent.
Depth to weathered bedrock: 5 to 20 inches
Reaction: moderately acid to neutral and may range to moderately alkaline immediately above the paralithic contact
Clay Content: averages 20 to 35 percent in the control section
A horizon
Hue: 10YR, 7.5YR
Value: 4 through 6 dry, 2 through 5 moist
Chroma: 2 to 4, dry or moist
Bt horizon
Hue: 10YR, 7.5YR, 5YR
Value: 3 through 6 dry, 2 through 5 moist
Chroma: 2 through 6, dry or moist
Texture: sandy clay loam, clay loam, and loam but is dominantly sandy clay loam. Some pedons may have thin horizons of silty clay loam.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Nodman soils are on pediments, mountains, and hills at elevations of 3,900 to 6,300 feet. These soils formed in colluvium, alluvium, or residuum from granite. Slopes range from 2 to 65 percent. The mean annual precipitation is 12 to 16 inches. The mean annual air temperature 57 to 67 degrees F. The frost-free period is 180 to 230 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Courtland and Romero series. Courtland soils are very deep. Romero soils do not have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; low to very high runoff; moderately slow permeability.
USE AND VEGETATION: Used for livestock grazing and wildlife habitat. Vegetation is Utah juniper, turbinella oak, singleleaf pinyon, shrubby buckwheat, desert ceanothus, and banana yucca.
DISTRIBUTION AND EXTENT: Northwestern and southeastern Arizona. This series is of moderate extent. MLRA is 38 and 41.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Mohave County, Arizona; Soil survey of Mohave County, Arizona, Central Part; 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 2 inches (A horizon)
Argillic horizon - The zone from 2 to 10 inches (Bt horizon)
Paralithic contact - The boundary at 10 inches (2Cr1 horizon)
Classified according to Soil Taxonomy, Second Edition; Keys to Soil Taxonomy, Tenth Edition, 2003.
The classification of this series was changed and the type location moved in July, 2004. Formerly, Nodman was classified as a Loamy-skeletal, mixed, superactive, thermic, shallow Typic Haplargids. The changes were facilitated by increased acreage and a better understanding of the soil moisture regimes in the area.