LOCATION PAAWAIYUNUYADE ID
Tentative Series
IRD BAG
11/2024
PAAWAIYUNUYADE SERIES
The Paawaiyunuyade series consists of very deep, somewhat poorly drained soils that formed in alluvium. These soils are on flood plains. Slopes are 0 to 2 percent. Mean annual precipitation is about 300 mm, and the mean annual temperature is about 8 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquic Calcixerolls
TYPICAL PEDON: Paawaiyunuyade silt loam in meadow. (Colors are for dry soil unless otherwise stated.)
A1--0 to 8 cm; brown (7.5YR 5/2) silt loam, dark brown (7.5YR 3/2) moist; moderate fine granular structure; soft, very friable, slightly sticky, and slightly plastic; common very fine and fine roots; many very fine irregular pores; strongly effervescent; strongly alkaline (pH 8.7); clear smooth boundary.
A2--8 to 30 cm; brown (7.5YR 5/3) silt loam, dark brown (7.5YR 3/3) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky, and slightly plastic; few fine and very fine roots; many very fine irregular and common very fine and fine tubular pores; strongly effervescent; very strongly alkaline (pH 9.6); clear wavy boundary.
Bkn--30 to 60 cm; pinkish gray (7.5YR 6/2) silt loam, brown (7.5YR 4/3) moist; moderate coarse subangular blocky structure; slightly hard, friable, slightly sticky, and slightly plastic; few very fine roots; common very fine irregular and tubular pores; strongly effervescent; 20 percent gravel; very strongly alkaline (pH 9.1); clear wavy boundary.
Bk--60 to 80 cm; pinkish gray (7.5YR 7/2) loam, brown (7.5YR 4/3) moist; moderate coarse subangular blocky structure; soft, very friable, moderately sicky, and moderately plastic; few very fine roots; common very fine and few fine irregular and tubular pores; violently effervescent, 5 percent calcium carbonate coats around rock fragments; 2 percent gravel; moderately alkaline (pH 8.4); gradual wavy boundary.
2Bkg--80 to 120 cm; white (7.5YR 8/1) extremely gravelly loam, pinkish gray (7.5YR 6/2) moist; moderate coarse subangular blocky structure; slightly hard, friable, moderately sicky, and moderately plastic; common very fine and few fine irregular and tubular pores; violently effervescent, 25 percent calcium carbonate coats around rock fragments; 70 percent gravel; strongly alkaline (pH 8.8); clear wavy boundary.
3Cg--120 to 150 cm; light brownish gray (10YR 6/2) loamy very fine sand, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky, and nonplastic; few very fine irregular pores; slightly alkaline (pH 7.7).
TYPE LOCATION: Bannock County, Idaho; USGS topographic quadrangle Pingree; latitude 43.006017 degrees north, longitude 112.602143 degrees west, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--9 to 10 degrees C
Thickness of mollic epipedon--25 to 45 cm
Depth to lithological discontinuity--60 to 105 cm
Depth to high water table--50 to 100 cm
Particle-size control section (weighted averages)
Clay content--18 to 26 percent
Rock fragments--15 to 35 percent
A horizons
Hue--7.5YR or 10YR
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Rock fragments--0 to 5 percent gravel
Effervescence--strongly or violently effervescent
Calcium carbonate equivalent--15 to 30 percent
Reaction--pH 8.5 to 9.7
Thickness--30 to 45 cm
Bk horizons
Hue--7.5YR or 10YR
Value--5 to 7 dry; 4 or 5 moist
Chroma--3 or 4 dry or moist
Texture--silt loam or loam
Rock fragments--0 to 15 percent gravel
Effervescence--strongly or violently
Calcium carbonate equivalent--25 to 40 percent
Reaction--pH 8.4 to 9.5
Thickness--30 to 60 cm
2Bkg horizon
Hue--7.5YR or 10YR
Value--7 or 8 dry; 5 or 6 moist
Chroma--1 or 2 dry or moist
Texture--loam or sandy loam
Rock fragments--60 to 85 percent gravel
Calcium carbonate equivalent--30 to 40 percent
Reaction--pH 8.5 to 9.3
Thickness--35 to 85 cm
3Cg horizon (when present)
Value--6 or 7 dry; 4 or 5 moist
Chroma--3 or 4 dry or moist
Texture--sand, fine sand or loamy very fine sand
Effervescence--nonefferrvescent or very slightly effervescent
Calcium carbonate equivalent--0 to 5 percent
Reaction--pH 7.2 to 7.8
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform--flood plains
Elevation--1,315 to 1,415 meters
Slope--0 to 2 percent
Parent material--alluvium
Mean annual precipitation--250 to 300 mm
Mean annual air temperature--7 to 8 degrees C
Frost-free period--100 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained; 1.5 to 5.0 um/sec
USE AND VEGETATION: Paawaiyunuyade soils are primarily used for pasture, hay, and wildlife habitat. The potential native vegetation is slender wheatgrass, alkali sacaton, alkali cordgrass, and Sandberg bluegrass.
DISTRIBUTION AND EXTENT: Paawaiyunuyade soils are of small extent in southeastern Idaho. MLRA 11
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Bannock County, Idaho, 2022. Paawaiyunuyade series is coined.
REMARKS: Diagnostic horizons and features in this pedon include:
Mollic epipedon--0 to 30 cm (A1 and A2 horizons)
Calcic horizon--60 to 120 cm (Bk2 and 2Bkg horizons)
Aquic conditions--80 to 150 cm (2Bkg and 3Cg horizons)
Particle-size control section--25 to 100 cm (A2, Bk1, Bk2 and 2Bkg horizons)
Paawaiyunuyade soils have a mesic temperature regime and an aridic moisture regime bordering on xeric.
National Cooperative Soil Survey
U.S.A.