LOCATION PERILLA                 AZ+TX

Established Series
Rev. LLJR/PDC/CEM
07/2012

PERILLA SERIES

The Perilla series consists of very deep, somewhat excessively drained soils that formed in fan alluvium from mixed sources. Perilla soils are on fan and stream terraces. Slopes range from 0 to 15 percent. Mean annual precipitation is about 14 inches and the mean annual air temperature is about 63 degrees F.

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Ustic Haplocambids

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

A--0 to 5 inches; brown (7.5YR 5/4) sandy loam, dark brown (7.5YR 3/4) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common fine roots; few very fine irregular pores; about 5 percent gravel; noneffervescent; slightly alkaline; clear wavy boundary. (1 to 6 inches thick)

Bw--5 to 21 inches; brown (7.5YR 5/4) sandy loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common fine roots; few fine irregular pores; noneffervescent; slightly alkaline; gradual wavy boundary. (14 to 18 inches thick)

2Bk1--21 to 29 inches; brown (7.5YR 5/4) fine sandy loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; few fine roots; few very fine tubular pores; about 5 percent gravel; thin calcium carbonate coatings on underside of gravel; strongly effervescent; slightly alkaline; clear wavy boundary. (5 to 15 inches thick)

2Bk2--29 to 43 inches; brown (7.5YR 5/4) gravelly sandy loam, brown (7.5YR 4/4) moist; massive; soft, very friable, nonsticky and nonplastic; few fine roots; few tubular pores; 20 percent gravel; common fine irregular calcium carbonate masses and few fine nodules; strongly effervescent; moderately alkaline; gradual wavy boundary. (10 to 21 inches thick)

2Bk3--43 to 60 inches; strong brown (7.5YR 5/6) gravelly sandy loam, brown (7.5YR 5/4) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; few fine irregular calcium carbonate masses; 25 percent gravel; few fine calcium carbonate nodules; strongly effervescent; moderately alkaline.

TYPE LOCATION: Cochise County, Arizona; 1/2 mile north of Davis Road and about 2 miles east of the 47 Ranch, 1400 feet west, 1700 feet south of northeast corner of section 17, T. 21 S., R. 25 E.

RANGE IN CHARACTERISTICS:

Soil moisture - Intermittently moist in some part of the soil moisture control section during December-February and July-September. Driest during May and June. Ustic aridic soil moisture regime.

Soil temperature - 60 to 69 degrees F.

Depth to carbonates - 15 to 30 inches; is disseminated and/or occurs as masses or nodules; calcium carbonate equivalent is less than 5 percent in any one subhorizon

Rock fragments - less than 35 percent in any one subhorizon

A horizon
Hue: 5YR, 7.5YR, 10YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 or 4, dry or moist
Organic matter: less than 1 percent
Texture: sandy loam, loamy fine sand, fine sandy loam

Bw horizon
Hue: 5YR, 7.5YR, 10YR
Value: 3 to 7, dry or moist
Chroma: 3 to 6, dry or moist
Texture: sandy loam, loam, fine sandy loam, loamy sand

Bk horizon
Hue: 5YR, 7.5YR, 10YR
Value: 3 to 7, dry or moist
Chroma: 3 to 6, dry or moist
Reaction: slightly alkaline to moderately alkaline
Texture: sandy loam, fine sandy loam, loamy sand, loamy fine sand, loam

COMPETING SERIES: These are the Chaparral (NM), Ima (NM), and Mallet (AZ) series. Chaparral soils are inactive. Mallet soils have accumulations of calcium carbonate below 30 inches. Ima soils are in the Great Plains and are moist in the soil moisture control section during May and June.

GEOGRAPHIC SETTING: Perilla soils are on fan and stream terraces. They formed in fan alluvium from volcanic and granitic rock. Slopes range from 0 to 15 percent. Elevation ranges from 2,900 to 5,500 feet. The mean annual precipitation is 12 to 16 inches. The mean annual air temperature is 59 to 67 degrees F. The frost-free period is 180 to 250 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Durazo and La Lande soils. Durazo soils are sandy and occur on slightly higher positions. La Lande soils have 18 to 35 percent clay and occur on slightly lower positions.

DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; moderately rapid permeability.

USE AND VEGETATION: Perilla soils are used for livestock grazing. Present vegetation includes soaptree yucca, ocotillo and annual forbs and grasses.

DISTRIBUTION AND EXTENT: Perilla soils are moderately extensive in southeast and central Arizona and west Texas. MLRAs are 38, 41, and 42.

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

SERIES ESTABLISHED: Yavapai County, Arizona. Soil survey of Black Hills-Sedona Area, Arizona, Parts of Coconino and Yavapai Counties; 1996.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - The zone from 0 to 5 inches (A horizon)

Cambic horizon - The zone from 5 to 60 inches (Bw, 2Bk1, 2Bk2, 2Bk3 horizons)

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

Revised for the correlation of Hudspeth County, Texas (Main Part) and Culberson County, Texas (Main Part); July, 2012, NMS

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National Cooperative Soil Survey
U.S.A.