LOCATION JORAIBI                 AZ

Established Series
Rev. RJA/DJP/RLB
10/2011

JORAIBI SERIES

The Joraibi series consists of deep, well drained, slowly permeable soils formed in stream alluvium. Joraibi soils are on alluvial fans and floodplains. Slopes are 0 to 3 percent. The average annual precipitation is about 8 inches and the mean annual air temperature is about 53 degrees F.

TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive, calcareous, mesic Typic Torrifluvents

TYPICAL PEDON: Joraibi clay loam-rangeland. (Colors are for dry soil unless otherwise noted.)

A--0 to 2 inches; reddish brown (5YR 5/4) clay loam, reddish brown (5YR 5/4) moist; moderate thin platy structure over weak fine granular; hard, firm, moderately sticky and moderately plastic; few very fine roots; common fine interstitial pores; EC 2 dS/m; SAR 23; slightly effervescent; moderately alkaline; abrupt smooth boundary. (1 to 4 inches thick)

C1--2 to 5 inches; reddish brown (5YR 5/4) clay loam, yellowish red (5YR 4/6) moist; weak medium platy structure; hard, firm, moderately sticky and moderately plastic; few very fine roots; few fine tubular pores; EC 2 dS/m; SAR 23; slightly effervescent; moderately alkaline; clear smooth boundary.

C2--5 to 11 inches; yellowish red (5YR 4/6) sandy clay loam, reddish brown (5YR 4/4) moist; structureless with thin-bedded laminae; hard, firm, moderately sticky and moderately plastic; common very fine roots; few fine tubular pores; EC 2 dS/m, SAR 23, slightly effervescent; strongly alkaline; clear smooth boundary.

C3--11 to 19 inches; light reddish brown (5YR 6/3) clay loam, reddish brown (5YR 5/4) moist; structureless with thin-bedded laminae; very hard, firm, very sticky and moderately plastic; few fine roots; common fine tubular pores; EC 1 dS/m; SAR 23; slightly effervescent; strongly alkaline; abrupt smooth boundary.

C4--19 to 23 inches; reddish brown (5YR 5/4) very fine sandy loam, yellowish red (5YR 4/6) moist; structureless with thin-bedded laminae; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; common fine tubular pores; EC 1 dS/m; SAR 23; slightly effervescent; strongly alkaline; abrupt smooth boundary. (the combined thickness of the C horizon is 16 to 40 inches)

2C5--23 to 26 inches; yellowish red (5YR 5/8) sand, yellowish red (5YR 5/8) moist; massive; hard, very friable, nonsticky and nonplastic; few very fine roots; few fine tubular pores; EC 10 dS/m; SAR 41; slightly effervescent; strongly alkaline; abrupt smooth boundary.

2C6--26 to 54 inches; reddish yellow (5YR 6/6) sand, with thin strata of coarse sand, fine sand, and very fine sandy loam, reddish brown (5YR 5/4) moist; structureless; slightly hard, very friable, nonsticky and nonplastic; few fine roots; few fine tubular pores; EC 10 dS/m; SAR 41; a 3.5 inch diameter clayball occurs at 28 inches; slightly effervescent; strongly alkaline; abrupt smooth boundary. (combined thickness of the 2C horizons is 20 inches or more)

3C7--54 to 60 inches; light reddish brown (5YR 6/4) stratified very fine sandy loam to clay loam, reddish brown (5YR 5/4) moist; structureless; some desiccation cracks to 5 feet or more; very hard, firm, sticky and very plastic; no roots; few fine tubular pores; EC 10 dS/m; SAR 25; slightly effervescent; moderately alkaline.

TYPE LOCATION: Coconino County, Arizona; southwest of Garces Mesa; about 0.2 miles north of the southwest corner of sec. 17, T. 25 N., R. 13 E.

RANGE IN CHARACTERISTICS:

Soil Moisture - Intermittently moist in some parts of the soil moisture control section during December-March and July-September. Typic aridic soil moisture regime.

Soil temperature - 53 to 59 degrees F.

Depth to contrasting particle-size - 16 to 40 inches

Carbonates - Less than 15 percent calcium carbonate equivalent, disseminated

A horizon
Hue: 5YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry and moist
Texture: fine sandy loam, sandy clay loam, clay loam
Reaction: moderately to strongly alkaline

C horizon
Hue: 5YR, 7.5YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 to 6, dry and moist
Texture: fine sandy loam, sandy clay loam, clay loam (clay averages 25 to 35 percent)

2C horizon
Hue: 5YR or 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 4 to 8 dry, 4 to 8 moist
Texture: sand, loamy sand, commonly with thin strata of finer textures

COMPETING SERIES: This is the Perwaso series. Perwaso soils contain more than 15 percent gravel size fragments in the contrasting horizon.

GEOGRAPHIC SETTING: Joraibi soils are on alluvial fans and flood plains. These soils formed in stream alluvium from sandstone, shale and other rocks. Slope ranges from 0 to 3 percent. Elevations are 4,600 to 5,400 feet. The average annual precipitation is 6 to 10 inches; mean annual air temperature is 52 to 57 degrees F.; and the frost-free period is 130 to 180 days. Precipitation falls as intense summer thunderstorms and as gentle winter rain or snow.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Jocity, Polacca, and Sheppard soils. Jocity soils are adjacent and lack contrasting particle-size. Polacca soils are on stream terraces and have cambic horizons. Sheppard soils are on dunes and have sandy particle-size.

DRAINAGE AND PERMEABILITY: Well drained, runoff is slow, permeability is slow in the upper part and rapid in the lower part.

USE AND VEGETATION: Joraibi soils are used for livestock grazing. Native vegetation is alkali sacaton, galleta, western wheatgrass, mound saltbush, and black greasewood.

DISTRIBUTION AND EXTENT: Northeastern Arizona. These soils are not extensive. MLRA 35, LRR-D.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona

SERIES ESTABLISHED: Coconino County Arizona, 1985. Hopi Area, Area, Parts of Coconino and Navajo Counties.

REMARKS: Diagnostic horizons and features recognized are:

Ochric Epipedon - the zone from 0 to 2 inches (A horizon)

Lack of diagnostic subsurface horizons

Abrupt textural change at 23 inches that affects water and root penetration

ADDITIONAL DATA: Laboratory data furnished by BIA Soils Lab Gallup, NM

These soils are sodic and saline in Coconino County

Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Eleventh Edition, 2010

Updated and revised for the correlation of Ft. Defiance Area AZ715 2/08 DWD

Update and revisions for the correlation of Little Colorado River Area (AZ707), Sept. 2011, CEM

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National Cooperative Soil Survey
U.S.A.