LOCATION HAPUR IDEstablished Series
The Hapur series consists of very deep, poorly drained soils that
formed in alluvium from mixed sources. Hapur soils are on channeled
bottomlands and floodplains and have slopes of 0 to 2 percent.
Permeability is moderately slow in the upper horizons and very rapid in
the lower horizons. The average annual precipitation is about 14
inches, and the average annual temperature is about 42 degrees F.
TAXONOMIC CLASS: Fine-loamy, frigid Typic Calciaquolls
TYPICAL PEDON: Hapur silt loam--on a 1 percent slope at an elevation
of 4,820 feet in wet meadow pasture. When described on Spetember 14,
1983, the soils was moist in the upper 6 inches and wet below this
depth. (Colors are for dry soil unless otherwise stated.)
Ak1--0 to 3 inches; gray (10YR 5/1) silt loam, very dark gray (10YR
3/1); strong medium granular structure; soft, very friable, slightly
sticky and plastic; many very fine, fine, and medium roots; many very
fine and fine tubular pores; strong effervescence (about 20 percent
calcium carbonate); moderately alkaline (pH 8.4); clear wavy boundary.
(2 to 5 inches thick)
Ak2--3 to 10 inches; gray (10YR 5/1) silty clay loam, very dark
gray (10YR 3/1) moist; weak fine and medium subangular blocky
structure; slightly hard, friable, sticky and plastic; many very fine,
fine, and medium roots; many very fine and fine tubular pores; strong
effervescence (about 20 percent calcium carbonate); moderately alkaline
(pH 8.2); clear wavy boundary. (4 to 10 inches thick)
Bkg--10 to 15 inches; gray (5Y 6/1) silty clay loam, dark gray (5Y
4/1) moist; moderate fine and medium subangular blocky structure; hard,
firm, sticky and plastic; common very fine, fine, and medium roots;
common very fine and fine tubular pores; slightly effervescence (about
10 percent calcium carbonate); mildly alkaline (pH 7.8); abrupt wavy
boundary. (3 to 8 inches thick)
Cg--15 to 30 inches; light gray (2.5Y 7/1) clay loam, gray (2.5Y
6/1) moist; massive; hard, firm, sticky and plastic; common very fine
and fine roots; common very fine and fine tubular pores; mildly
alkaline (pH 7.4); clear wavy boundary. (12 to 22 inches thick)
2Cg1--30 to 44 inches; light gray (2.5Y 7/1) fine sandy loam, gray
(2.5Y 6/1) moist; massive; slightly hard, friable, sticky and slightly
plastic; common very fine and fine roots; few very fine and fine
tubular pores; mildly alkaline (pH 7.4); clear wavy boundary. (11 to
18 inches thick)
2Cg2--44 to 51 inches; light gray (2.5Y 7/l) loamy fine sand, gray
(2.5Y 6/1) moist; massive; slightly hard, friable, slightly sticky and
slightly plastic; few very fine and fine roots; many very fine and fine
interstitial pores; mildly alkaline (pH 7.4); gradual wavy boundary.
(5 to 11 inches thick)
3Cg--51 to 63 inches; light gray (2.5Y 7/1) very gravelly loamy
sand, gray (2.5Y 6/1) moist; single grain, loose; many very fine and
fine interstitial pores; about 40 percent pebbles; mildly alkaline (pH
7.4).
TYPE LOCATION: Blaine County, Idaho; about 2,600 feet south and 50
feet east of the northwest corner of sec. 23, T. 1 S., R. 19 E.; about
2.5 miles south of Gannett.
RANGE IN CHARACTERISTICS:
Depth to high water table - 6 to 12 inches
Depth to sand and gravel - 40 inches or more
Average annual soil temperature - 42 to 47 degree F
Profile effervescence - slight to strong effervescence in the upper 20
inches, noneffervescent below 20 inches
A horizon - has value of 4 or 5 dry and 2 or 3 moist and chroma of 1 or
2 dry of moist
Reaction of mildly alkaline to strongly alkaline
Calcium carbonate of 15 to 25 percent
Bkg horizon - has value of 5 or 6 dry and 3 or 4 moist; and chroma of 1
or 2 dry or moist
Textures of SICL, CL, L
Reaction of neutral to strongly alkaline
Calcium carbonate of 10 to 25 percent
Cg horizon - has hue of 5Y, 2.5Y, or 10YR, and value of 6 or 7 dry and
4 or 5 moist, and chroma of 0 to 2 dry or moist
Textures of FSL, LFS, GRV-COS, GRV-LS
Reaction of neutral through moderately alkaline
COMPETING SERIES: These are the Nortonville and Vallers series.
Nortonville soils have gypsic horizons. Vallers soils lack a calcic
horizon in the A1 and lack a layer with less than 20 percent clay above
40 inches.
GEOGRAPHIC SETTING: Hapur soils occur on level to nearly level
undulating channeled bottomlands and floodplains. Elevation ranges
from 4,700 to 5,550 feet. Slopes range from 0 to 2 percent. The soils
formed in alluvium from mixed sources. The average annual temperature
ranges from 40 to 44 degrees F. The average annual precipitation is
from 12 to 16 inches and the frost-free period ranges from 60 to 100
days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bickett, Hutton,
Marshdale, and the Picabo soils. Bickett soils have an organic layer
on the soil surface and are very poorly drained. Hutton soils have
more than 35 percent clay in the control section. Marshdale soils have
a mollic epipedon greater than 20 inches thick and have an irregular
decrease in organic matter with depth. Picabo soils are calcareous
throughout the control section and are somewhat poorly drained.
Bickett, Marshdale, and Hutton soils occur on the same landscape.
Picabo soils occur on stream terraces.
DRAINAGE AND PERMEABILITY: Poorly drained. Permeability of the upper
horizons is moderately slow and very rapid in the lower horizons.
USE AND VEGETATION: These soils are used for wildlife habitat and wet
meadow pasture. Natural vegetation includes rushes, sedges, shrubby
cinquefoil, and willow.
DISTRIBUTION AND EXTENT: The series is inextensive in Blaine County,
Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Blaine County, Idaho, 1985.
REMARKS: Diagnostic features characteristic to Typic Calciaquolls
soils have aquic moisture regime.
Calcic horizon occur in the upper 15 inches of the soil (AK1, AK2, and
Bkg horizons)
Mollic epipedon occurs in the upper 10 inches (AK1 and AK2 horizons)
National Cooperative Soil Survey