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Soils on Granitic Terrain

Dgb - Devonian Granite - Gentle | Dgn - Devonian Granite | Dgt - Devonian Granite - Steep

Dgb - Devonian Granite - Gentle

Land Capability Study - Ballan - Land Unit - Devonian Granite - Gentle - DgbThis unit is more gently sloping than the nearby Dgt unit. The unit covers 4.2 km2 or 0.45% of the survey area. The vegetation consists of E. ovata (swamp gum) being associated with E. viminalis (mannagum). Most of the area is cleared and used for grazing sheep and cattle.

DGB Red Mottled Brown Duplex Soils

Factual Key Db 2.42/SCL-LS, 15-45/granite, 100-200

Horizon
Depth (cm)
Description
A1
0-25Brownish black (10YR 3/2) when moist; sandy clay loam; apedal & massive; consistence when dry is hard; pH 6.0; diffuse boundary.
A2
25-35Dull yellowish brown (10YR 5/3) when moist; loamy sand; apedal & masssive; consistence when dry is hard; pH 6.0; abrupt boundary.
B
35-110Brown when moist; few & faint red mottles; heavy clay; moderate angular blocky 3 mm; consistence when slightly moist is firm; pH 6.5; clear boundary.
BC
110-200+Dull yellowish brown (10YR 5/4) when moist; common & distinct red mottles; sandy clay; weak angular blocky 2 mm; consistence when slightly moist is firm; pH 7.0.

COMPONENT
Proportion %
1
100
CLIMATE
Rainfall(av.) mm
500 – 560
Temperature(av.) C
-
Seasonal growth limitations
-
GEOLOGY
Age, rock
Devonian granodiorite
TOPOGRAPHY
Landscape
Gentle, sloping terrain
Elevation (range) m
394 – 420
Local relief (av.) m
10
Drainage pattern
Dendritic
Drainage density km/km2
0.3
Land form
Plains
Position on land form
-
Slope (range) %, slope shape
3 – 6; Convex
NATIVE VEGETATION
Structure
Open forest
Dominant species
E. ovata, E. viminalis
SOIL
Parent material
In-situ weathered rock
Description
Red mottled brown duplex soil, coarse structure
Surface texture
Sandy loam
Permeability
Moderate – low
Depth (range) m
1.5
LAND USE
Grazing
SOIL DETERIORATION
Critical land features
Hard setting surfaces, slopes
Processes
Overland flow
Forms
Sheet & gully erosion

Dgn - Devonian Granite

Land Capability Study - Ballan - Land Unit - Devonian Granite - DgbThere is only one small location of this it within the survey area and that is on the west side of Hopwoods Hill, north-west of Mt. Egerton. The unit is used for grazing. It covers about 0.2 km2 or .02% of the survey area.

DGN Red Mottled, Yellow Duplex Soils

Factual Key Dy 3.41/COSL-SCL, 20-60/Weathered granite, 80-200

Horizon
Depth (cm)
Description
A1
0-10Brownish black (10YR 2/2) when moist; coarse sandy clay loam; apedal & massive; consistence when dry is hard; pH 5.5; sharp boundary.
A2
10-50Dull yellowish brown (10YR 5/3) when moist; coarse sandy clay loam; apedal & massive; consistence when dry is hard; pH 5.8; sharp boundary.
Sometimes just above the B horizon, there is a hard cemented layer or yellow layer (A3) of the same texture as the A2.
B
50-100+Yellowish brown (10YR 5/8) when moist; clay mottled red; strong angular blocky 2 mm; consistence when dry is hard; pH 6.0.

COMPONENT
Proportion %
1
2
30
70
CLIMATE
Rainfall(av.) mm
500 – 560
Temperature(av.) C
-
Seasonal growth limitations
-
GEOLOGY
Age, rock
Devonian, granite, granodiorite
Quaternary; wash-gravel sand and clay
TOPOGRAPHY
Landscape
Hilly and rolling country in the centre, south of the Shire
Elevation (range) m
520
Local relief (av.) m
30
Drainage pattern
Dendritic
Drainage density km/km2
4.8
Land form
Hill
Fan and terrace
Position on land form
Crest and slope
Drainage line
Slope (range) %, slope shape
2 – 10; Convex
1 – 3; Straight
NATIVE VEGETATION
Structure
Open forest
Dominant species
E. viminalis, E. radiata
E. ovata, E. obliqua, E. radiata
SOIL
Parent material
In-situ weathered rock
Unconsolidated wash
Description
Red mottled yellow duplex soil
Surface texture
Sandy loam
Permeability
Moderate
Moderate – Low
Depth (range) m
1
1
LAND USE
Soil and gravel stripping
Grazing
SOIL DETERIORATION
Critical land features
Moderate slope, low permeability, hard setting surfaces
Poor drainage, low permeability, hard setting surfaces, dispersible soils
Processes
Overland flow, subsurface low, deep seepage, leaching of salts
Accumulation of salts, overland flow and waterlogging, subsurface flow
Forms
Rill & gully erosion
Salting, gully erosion, compaction

Dgt - Devonian Granite - Steep

Land Capability Study - Ballan - Land Unit - Devonian Granite - Steep - DgtThis unit consists mainly of granodiorite scarps along the Werribee River at Ingliston. The unit covers 2.6 km2 or 0.28% of the survey area. It is presently used for grazing but needs careful management to prevent erosion. The steep slopes and erodible soils are major limitations to any more intensive use than grazing.

DGT Brown Sand Soils Uniform Texture

Factual Key Uc 2.33/LS. 50-100/Granite, 200+

Horizon
Depth (cm)
Description
A1
0-20Dark brown (10YR 3/3) when moist; loamy sand; apedal & massive; consistence when slightly moist is friable; pH 5.5; clear boundary.
A2
20-70Dull yellowish brown (10YR 4/3) when moist; loamy sand; apedal & massive; consistence when slightly moist is friable; pH 6.0; abrupt boundary.
B21
70-140Brownish black (10YR 3/2) when moist with abundant prominent grey mottles; apedal & massive; consistence when dry is very hard; abundance of prominent grey mottles 3 mm; hard accumulation (hard pan) of coffee rock; clear boundary.
B22
180+Yellowish brown (10YR 5/6) when moist; sand; apedal & massive; consistence when slightly moist is friable.

COMPONENT
Proportion %
1
2
95
5
CLIMATE
Rainfall(av.) mm
500 – 560
Temperature(av.) C
-
Seasonal growth limitations
-
GEOLOGY
Age, rock
Devonian granodiorite
TOPOGRAPHY
Landscape
Granodiorite scarps along the Werribee River in the Ingliston area
Elevation (range) m
243 – 360
Local relief (av.) m
50
Drainage pattern
Dendritic
Drainage density km/km2
2.6
Land form
Slopes & Scarps
Depression line
Position on land form
-
-
Slope (range) %, slope shape
15 – 35; Convex
1 – 3; Straight
NATIVE VEGETATION
Structure
Open forest (?)
Dominant species
E. viminalis
SOIL
Parent material
In-situ weathered rock
Unconsolidated alluvium sands & clays
Description
Brown sand soil, uniform texture
Dark greyish brown duplex soil, coarse structure
Surface texture
Sandy loam
Sandy loam
Permeability
High
Moderate
Depth (range) m
1
1.5
LAND USE
Grazing
SOIL DETERIORATION
Critical land features
Slopes
Hard setting surfaces
Processes
Overland flow
Overland flow, sub-surface flow
Forms
Sheet erosion
Gully, sheet and tunnel erosion
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