Marong map unit Tfe2

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

Map Unit:	Tertiary fan, gentle slope, 2	Map Unit Symbol:	Tfe2
		% of Study Area:	0.04

Land-form diagram for Marong map unit Tfe2

General Description:
Colluvial fans developed on the southern slopes of the metamorphic aureole ridge overlying granodiorite. The soils are dominantly yellow duplex with fine sandy loam topsoils, hardsetting, bleached A2 horizons and extremely mottled clay subsoils. Many quartz and metamorphosed sedimentary fragments occur on the soil surface and throughout the profile. In the subsoil, the combination of clay and gravel has produced a compacted layer. Variations include fewer coarse fragments within the profile, particularly on lower slopes. Drainage lines within this unit often expose granodiorite boulders and so have been classified as granitic.

Site characteristics:

Parent material age:	Tertiary	Depth seasonal watertable:	> 5 m
Lithology:	Sediments	Potential recharge to groundwater:	Moderate
Landform Pattern:	Undulating hills	Flooding risk:	Nil
Element:	Slopw	Drainage:	Well drained
Slope common:	9%	Depth to hardrock:	> 1.5 m
Slope range:	3-10%
Rock outcrop:	0%

Major vegetation: Grey Box, Yellow Box, Red Stringybark, Golden Wattle, Lightwood, Hedge Wattle, Spreading Wattle

Present land use: Native pasture

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

Soil profile characteristics:

Permeability (measured - average, range):	510, 330 - 650 mm/day
Permeability (estimated):	-
Available water capacity:	287 mm H₂O
Linear shrinkage (B horizon):	12.4%

Soil profile description:

A	0 -14 cm	Brownish black (10YR3/2) fine sandy loam, weak structure, subangular blocky peds 5-10 mm, rough fabric, moderately weak consistence, many medium sized subangular metamorphic and quartz gravel fragments, moderate organic matter, pH 6.2. Clear transition to
A2	14-44 cm	Dull yellowish brown (10YR5/4) hardsetting fine sandy loam, bleached (10YR7/4) when dry, massive, earthy fabric, moderately weak consistence, a few medium sized subangular metamorphic and quartz gravel fragments, pH 5.4. Abrupt transition to
B	44-112 + cm	Dull yellow orange (10YR6/7) medium clay, abundant medium sized distinct grey, orange, red and white mottles, moderate structure, subangular blocky peds 5-10 mm, rough fabric, moderately firm consistence, many coarse angular metamorphic and quartz fragments, pH 4.6.

Soil classification:

Factual Key (Northcote):	Dy 3.41
Australian Soil Classification:	Bleached-Mottled, Yellow, Kurosol; deep, thick, loamy, moderately gravelly
Unified Soil Group:	CL

Interpretation of soil analyses*

Horizon	pH	Gravel %	E.C. (salts)	Nutrient Status	P	K	Al	Organic Matter	Dispersibility
A	6.2	44	VL	L	S	S	S	M	H
A2	5.3	19	VL	L	S	S	S	L	H
B	4.6	34	L	L	S	S	S	VL	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)	C₃T₃S₅	Very susceptible to sheet/rill erosion
Effluent disposal (septic tanks)	2	Nil
Farm dams (earthen)	4	Low suitablity of subsoil, lack of dispersion in subsoil, rapid permeability
Building foundations - slab	3	Gentle slope
Building foundations - stumps/footings	2	Nil
Secondary roads	3	Gentle slope, Universal Soil Group
Urban residential	3	Secondary roads, building foundations (slab)
Rural residential	4	Farm dams

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