LOCATION DUTCHFLAT AZ
Established Series
Rev. WJ/RKS/DWD/HCD
04/2015
DUTCHFLAT SERIES
The Dutchflat series consists of very deep, well drained soils that formed in mixed igneous and metamorphic alluvium. Dutchflat soils are on fan terraces and have slopes of 0 to 12 percent. The mean annual precipitation is about 9 inches. The mean annual air temperature is about 65 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Haplargids
TYPICAL PEDON: Dutchflat fine sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; light yellowish brown (10YR 6/4) fine sandy loam, yellowish brown (10YR 5/4) moist; common medium platy structure; soft, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine irregular pores; 10 percent gravel; noneffervescent; slightly alkaline (pH 7.8); abrupt smooth boundary. (1 to 3 inches thick)
Bt--2 to 28 inches; brown (7.5YR 5/4) gravelly sandy clay loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular pores; few faint clay films on ped faces and in pores; 30 percent gravel; noneffervescent; moderately alkaline (pH 8.0); clear smooth boundary. (20 to 28 inches thick)
2Btk--28 to 41 inches; brown (7.5YR 5/4) gravelly sandy clay loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; few faint clay films on ped faces and in pores; 30 percent gravel; strongly effervescent; few very fine soft seams and filaments of calcium carbonate; moderately alkaline (pH 8.0); clear smooth boundary. (4 to 13 inches thick)
2Bk--41 to 60 inches; brown (7.5YR 5/4) very gravelly coarse sandy loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; 40 percent gravel; strongly effervescent; moderately alkaline (pH 8.0).
TYPE LOCATION: Mohave County, Arizona; located at a latitude of 35 degrees, 05 minutes, 02 seconds north and a longitude of 114 degrees, 12 minutes, 34 seconds west; 200 feet north and 350 feet east of the southwest corner of section 29, T. 20 N., R. 18 W. Gila and Salt River Base Meridian.
RANGE IN CHARACTERISTICS:
Soil Moisture: Intermittently moist in some part of the soil moisture control section during December - February and for less than 20 days cumulative during July - September. Driest during May and June. Typic aridic soil moisture regime.
Soil Temperature: 61 to 72 degrees F.
Depth to calcium carbonate: more than 9 inches; commonly 20 to 31 inches
Rock fragments: averages less than 35 percent in the control section
A horizon
Hue: 10YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Bt horizon
Hue: 10YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture: sandy clay loam, clay loam (20 to 35 percent clay)
Rock fragments: 15 to 35 percent
Btk and Bk horizons
Hue: 10YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Calcium carbonate equivalent: 5 to 10 percent
Rock fragments: 15 to 60 percent gravel
Some pedons have nongravelly coarse sandy loam C horizons beneath the argillic.
COMPETING SERIES: These are the
Anway (AZ),
Avenal (CA),
Bryman (CA),
Bucklebar (NM),
Garlock (CA),
Hi Vista (CA),
Lanip (NV) (T),
Milham (CA),
Neuralia (CA) and
Palomas (NM), series. Avenal, Bryman, Milham, and Neuralia soils are dry in the moisture control section during the summer months. Garlock and Palomas soils have highly weathered granite above 40 inches. Hi Vista soils have a lithic contact above 40 inches. Anway, Bucklebar and Palomas soils are moist more than 20 cumulative days during July-September. Lanip soils have calcium carbonate at depths of less than 9 inches.
GEOGRAPHIC SETTING: Dutchflat soils are on fan terraces. Slopes range from 0 to 12 percent. These soils formed in mixed igneous and metamorphic alluvium. Elevations range from 2,400 to 4,800 feet. The mean annual precipitation is 6 to 12 inches. The mean annual air temperature is 57 to 70 degrees F. The frost-free period is about 200 to 250 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Arizo,
Franconia,
Lostman and
Whitehills soils. Arizo soils are sandy-skeletal. Franconia soils are sandy. Whitehills soils are moderately deep to a duripan.
DRAINAGE AND PERMEABILITY: Well drained; low or medium runoff; moderate permeability.
USE AND VEGETATION: Used for livestock grazing and wildlife habitat. Vegetation includes big galleta, bush muhly, red brome, creosotebush, white bursage and range ratany.
DISTRIBUTION AND EXTENT: Northwestern Arizona. This series is of moderate extent. MLRA is 30. The name is from a valley in the area.
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 41 inches (Bt, 2Btk horizons)
This series originally proposed in Mohave County, Arizona; Soil survey of Mohave County, Arizona, Southern Part; 1993.
Classified according to Keys to Soil Taxonomy Ninth Edition, 2003.
Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 6/2005. ET
National Cooperative Soil Survey
U.S.A.