Marong map unit Dgc

Back to: A Land Capability Study of the Rural City of Marong

Map Unit:	Devonian granodiorite, moderate slope	Map Unit Symbol:	Dgc
		% of Study Area:	1.5

Land-form diagram for Marong map unit Dgc

General Description:
The moderate slopes on rolling low hills are a minor component of the granodiorite. The unit has a mixture of two soil types. Shallow uniform sands, similar to those associated with units Dga and Dgb, are dominant. They occur on the steeper, rockier slopes. Yellow duplex soils, like those found on units Dgd, Dge and Dgf occur on the gentler slopes.

Site characteristics:

Parent material age:	Devonian	Depth seasonal watertable:	> 5 m
Lithology:	Granodiorite	Potential recharge to groundwater:	High
Landform Pattern:	Rolling low hills	Flooding risk:	Nil
Element:	Slope	Drainage:	Rapidly drained
Slope common: range:	20% 10 - 32%	Depth to hardrock:	0.7 m (Variable)
Rock outcrop:	10 - 20%

Major vegetation: Yellow Box, Grey Box, Long-leaf Box, Blackwood, Buloke, Lightwood, Black Wattle, Wallaby Grass, Kangaroo Grass, Black-anther flax-lily.

Present land use: Sheep grazing.

Land degradation:	Water erosion		Wind erosion	Salting	Acidification
Land degradation:	Sheet/rill	Gully	Wind erosion	Salting	Acidification
Susceptibility	High	Moderate	Moderate	Low	Low
Incidence	Moderate	Low	Moderate	Low	Low

Soil profile characteristics:

Permeability (measured - average, range):	20080, 12923 - 29583 mm/day
Permeability (estimated):	-
Available water capacity:	130 mm H₂O
Linear shrinkage (B horizon):	N.A.

Soil profile description:

A	0 - 10 cm	Dark reddish brown (5YR3/2) sandy loam, apedal, sandy fabric, high organic matter, pH 5.5. Clear transition to
C	10 - 70 cm	Reddish brown (5YR4/4) clayey sand, apedal, sandy fabric, a few quartz fragments, pH 5.4
	70+ cm	Rock

Soil classification:

Factual Key (Northcote):	Uc 1.23 (major) Dy 3.41 (minor)
Australian Soil Classification:	Arenic Rudosol; shallow thin loamy, non-gravelly
Unified Soil Group:	SM

Interpretation of soil analyses*

Horizon	pH	Gravel %	E.C. (salts)	Nutrient Status	P	K	Al	Organic Matter	Dispersibility
A1	5.5**	21.2	VL	L	D	S	T	H	L
B	5.4**	29.0	VL	VL	D	S	T	L	L

VL : Very Low; L : Low; M : Moderate; H : High; VH : Very High; D : Deficient; S : Satisfactory; T : Toxic; **: Acid * See Appendix 4 for analytical results

Land capability assessment

Land Use	Class	Major limiting feature(s)/ landuse
Agriculture (CTS values)	C₃T₄S₄	High gravel/stone/boulder content, shallow depth to hardrock, high susceptible to sheet erosion, shallow depth of topsoil, low permeability index, moderate slope
Effluent disposal (septic tanks)	4	Shallow depth to hardrock, excessive permeability – risk of polluting groundwater
Farm dams (earthen)	5	Shallow depth to hardrock, excessive permeability
Building foundations - slab	4	Moderate slope
Building foundations - stumps/footings	3	Moderate slope, moderate risk of slope failure, outcropping of tors, shallow depth to hardrock
Secondary roads	4	Moderate slope
Urban residential	4	Secondary roads, building foundations (slab)
Rural residential	5	Farm dams

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