Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart

86 Soil Survey
brown (10YR 5/4) moist, redox concentrations;
weak fine granular structure; extremely hard,
friable, moderately sticky, moderately plastic;
few fine and medium and common very fine
roots; common very fine and fine pores; strongly
effervescent; moderately alkaline (pH 8.4);
gradual wavy boundary.
Cg1—15 to 31 inches; light gray (5Y 7/1) clay loam,
gray (5Y 6/1) moist; few fine prominent yellowish
brown (10YR 5/4) moist, redox concentrations;
massive; extremely hard, friable, moderately
sticky, moderately plastic; few very fine to
medium roots; common very fine and fine pores;
disseminated lime; strongly effervescent;
moderately alkaline (pH 8.4); clear wavy
boundary.
Cg2—31 to 36 inches; light olive gray (5Y 6/2)
gravelly loam, olive gray (5Y 5/2) moist; few fine
prominent yellowish brown (10YR 5/4) moist,
redox concentrations; massive; extremely hard,
friable, moderately sticky, moderately plastic; few
very fine roots; common very fine and fine pores;
15 percent gravel; strongly effervescent;
moderately alkaline (pH 8.4); clear wavy
boundary.
Cg3—36 to 44 inches; light olive gray (5Y 6/2)
gravelly sandy loam, olive gray (5Y 5/2) moist;
massive; extremely hard, friable, moderately
sticky, moderately plastic; few very fine roots;
common very fine and fine pores; 20 percent
gravel; strongly effervescent; moderately alkaline
(pH 8.4); clear wavy boundary.
Cg4—44 to 60 inches; light olive gray (5Y 6/2) clay
loam, olive gray (5Y 4/2) moist; few medium
prominent gray (N 6/) moist, redox depletions;
massive; extremely hard, extremely firm, very
sticky, very plastic; few very fine pores; strongly
effervescent; moderately alkaline (pH 8.2).
Range in Characteristics
Soil temperature: 42 to 46 degrees F
Moisture control section: Between 4 and 12 inches
Thickness of the mollic epipedon: 7 to 18 inches
Depth to the seasonal high water table: +6 to
24 inches
Note: Some pedons do not have a Cg4 horizon.
A horizon
Hue: 5Y or N
Value: 3 to 5 dry; 2 or 3 moist
Chroma: 0 or 1
Texture (less than 2 mm): Clay loam or loam
Clay content: 18 to 35 percent
Content of rock fragments: 0 to 15 percent gravel
Reaction: pH 6.1 to 7.8
Bg horizon
Hue: 5Y or N
Value: 4 to 6 dry; 3 to 6 moist
Chroma: 0 to 2
Redox concentrations: None to common; chroma
of 4 or 6
Texture (less than 2 mm): Clay loam, silt loam, or
loam
Clay content: 20 to 35 percent
Content of rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 1 to 15 percent
Reaction: pH 6.6 to 8.4
Cg1 horizon
Hue: 10YR, 2.5Y, 5Y, or N
Value: 5 to dry; 5 or 6 moist
Chroma: 0 to 2
Redox concentrations: Few to many; chroma of 4
or 6
Redox depletions: None to common; chroma of 0
or 1
Texture (less than 2 mm): Clay loam, silt loam, or
loam with strata of sandy loam
Clay content: 20 to 35 percent
Content of rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 1 to 15 percent
Reaction: pH 6.6 to 8.4
Cg2 and Cg3 horizons
Hue: 5Y, 2.5Y, or N
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 0 to 2
Redox concentrations: None to many; chroma of
4 or 6
Redox depletions: None to common; chroma of 0
or 1
Texture (less than 2 mm): Clay loam, silt loam, or
loam with strata of sandy loam
Clay content: 20 to 35 percent
Content of rock fragments: 0 to 35 percent—0 to
10 percent cobbles; 0 to 25 percent gravel
Calcium carbonate equivalent: 1 to 15 percent
Reaction: pH 6.6 to 8.4
Cg4 horizon
Hue: 5Y, 2.5Y, or N
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 0 to 2
Redox concentrations: None to many; chroma of
4 or 6
Redox depletions: None to common; chroma of 0
or 1
Texture (less than 2 mm): Clay loam or clay
Clay content: 28 to 40 percent
Content of rock fragments: 0 to 35 percent—0 to
10 percent cobbles; 0 to 25 percent gravel