LOCATION BARNARD OR+CA ID NVEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Argiduridic Durixerolls
TYPICAL PEDON: Barnard silt loam - pasture. (Colors are for dry soil unless otherwise noted.)
A--0 to 7 inches; grayish brown (10YR 5/2) silt loam, very dark grayish brown (10YR 3/2) moist; weak thin platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine tubular pores; neutral (pH 7.2); clear smooth boundary. (6 to 11 inches thick)
AB--7 to 14 inches; brown (10YR 5/3) clay loam, dark brown (10YR 3/3) moist; weak thin platy structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine and fine tubular pores; few krotovinas; neutral (pH 7.2); clear smooth boundary. (0 to 8 inches thick)
2Bt--14 to 22 inches; brown (7.5YR 5/4) silty clay, dark brown (7.5YR 4/4) moist; weak fine prismatic parting to moderate medium subangular blocky structure; very hard, firm, very sticky and very plastic; common very fine and fine roots; common very fine tubular pores; common distinct clay films on peds; few mycelial threads of calcium carbonate in lower part; mildly alkaline (pH 7.4); abrupt smooth boundary. (6 to 21 inches thick)
2Bkqm--22 to 30 inches; white (10YR 8/2) indurated hardpan, brown (10YR 4/2) moist; platy; extremely hard and extremely firm; laminar capping on surface and on plates; strongly effervescent; moderately alkaline (pH 8.4). (3 to 24 inches thick)
3C--30 to 60 inches; very pale brown (10YR 8/3) very gravelly loam, pale brown (10YR 6/3) moist; massive; very hard, firm, slightly sticky and slightly plastic; moderately alkaline (pH 8.4).
TYPE LOCATION: Baker County, Oregon; about 2 miles west of Richland on the south side of the road, NE corner of the NW1/4NE1/4 sec. 21, T. 9 S., R. 45 E.
RANGE IN CHARACTERISTICS: Depth to the duripan and thickness of the solum ranges from 20 to 40 inches. The solum reaction ranges from slightly acid to mildly alkaline. The mean annual soil temperature is 47 to 53 degrees F. The soils have an aridic moisture regime and are moist in some part between 4 and 12 inches for as long as 60 consecutive days during the winter months.
The A horizon has color value of 2 or 3 moist and 4 or 5 dry, and chroma of 2 or 3 moist and dry. It is silt loam, loam, clay loam, gravelly loam, cobbly loam, and stony sandy loam.
The 2Bt horizon has color hue of 7.5YR or 10YR, value of 5 or 6 dry and 3 or 4 moist, and chroma of 2 or 4 dry and moist. It is heavy silty clay loam, silty clay, clay, or cobbly clay loam. The clay percentage is 35 to 50. The structure is weak, moderate, or strong prismatic and moderate or strong blocky. It is calcareous in the lower part in some pedons. It has 0 to 15 percent cobbles and 0 to 10 percent gravel.
The Bkqm is indurated throughout or indurated in the upper few inches and weakly or strongly cemented below. Color value dry is 6 through 8, 4 through 6 moist, and chroma of 2 or 3. It is massive or platy. It is silica cemented or lime-silica cemented. The thickness of the cemented horizon ranges from 3 to 24 inches, but generally it is 6 to 10 inches thick.
The 3C horizon is stratified alluvium to a depth of 60 inches or more. It is typically very gravelly loam, very gravelly sandy loam, very gravelly loamy sand, vert gravelly loamy coarse sand, or cobbly loam. It has 0 to 20 percent cobbles and 10 to 35 percent gravel. It is mildly to strongly alkaline.
COMPETING SERIES: These are the Adios, Decan, Fleischmann, and Xerta series. Adios soils have hard bedrock underlying the duripan. Decan soils are moist for 10 to 20 days cumulative during the period July through October due to summer convection storms. Fleischmann soils lack the laminar silica capping on the duripan. Xerta soils have bedrock at 20 to 40 inches and have 35 to 65 percent coarse fragments in the solum.
GEOGRAPHIC SETTING: Barnard soils are on terraces and fan and terrace pediments. They formed in mixed lacustrine and alluvial sediments. Some areas of this soil have an influence of volcanic ash in the surface layer. Elevation is 2,300 to 5,100 feet. In California and Nevada it ranges to 6,200 feet. Slope is 0 to 45 percent. The climate is characterized by cool wet winters and hot dry summers. The mean annual temperature is 45 to 52 degrees F. The mean annual precipitation is 9 to 13 inches. The frost-free period is 80 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Balm, Delma, Lookout, Ruckles, and Ruclick soils. Balm soils are on bottom lands and are somewhat poorly drained. Delma soils have a paralithic contact within a depth of 20 inches. Lookout soils have ochric epipedons. Ruckles soils are clayey-skeletal and shallow over basalt. Ruclick soils are clayey-skeletal and moderately deep over basalt.
DRAINAGE AND PERMEABILITY: Well drained; permeability is slow to the duripan.
USE AND VEGETATION: Irrigated cropland, hay, pasture, and range. Native vegetation is mainly bluebunch wheatgrass, Sandberg bluegrass, and Thurber needlegrass.
DISTRIBUTION AND EXTENT: Northeastern Oregon, southwestern Idaho, northern Nevada and northeastern California; MLRA 10, 21, 24, 25, 26, 27. The soils of this series are of moderate extent.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Baker County, Oregon; 1942.
REMARKS: Diagnostic horizons and features of this pedon include:
Mollic epipedon - from surface to 14 inches (A and AB horizons).
Argillic horizon - from 14 to 22 inches (2Bt horizon).
Duripan - from 22 to 30 inches (2Bkqm horizon).
Aridic soil moisture regime.
NSTH 17, RECLASSIFICATION ONLY, 3/95