Marong map unit Tfe1

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

Map Unit:	Tertiary fan, gentle slope, 1	Map Unit Symbol:	Tfe1
		% of Study Area:	0.2

Land-form diagram for Marong map unit Tfe1

General Description:
These gentle fans were derived from Ordovician sediments and overlie the western margin of the granodiorite. The associated soils are deep red duplex with hardsetting loam top soils and red heavy clay subsoils which become brown and mottled with depth. The soils are well structured and calcium carbonate nodules occur deep in the profile.

Site characteristics:

Parent material age:	Ordovician	Depth seasonal watertable:	> 2 m
Lithology:	Sediments	Potential recharge to groundwater:	Low
Landform Pattern:	Undulating rises	Flooding risk:	Nil
Element:	Slope	Drainage:	Well drained
Slope common:	8%	Depth to hardrock:	> 1.6 m
Slope range:	3 - 10%
Rock outcrop:	< 2 m

Major vegetation: Grey Box, Yellow Box, Red Ironbark, Red Gum, Lightwood, Hedge Wattle, Wallaby Grass, Oxalis, Onion Grass, moss, rushes

Present land use: Grazing (major), cropping, native forest (minor)

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

Soil profile characteristics:

Permeability (measured - average, range):	5, 3-8 mm/day
Permeability (estimated):
Available water capacity:	265 mm H₂O
Linear shrinkage (B horizon):	14.6 %

Soil profile description:

A1	0-15 cm	Dark reddish brown (5YR3/2) hardsetting loam, moderate structure, subangular blocky peds 5-10 mm, smooth fabric, moderately firm consistence, a few fine rounded ferruginous gravel fragments, pH 5.8 Clear transition to
B21	15-58 cm	Dull reddish brown (5YR4/4) heavy clay, moderate structure, subangular blocky peds 10-20 mm, smooth fabric, moderately firm consistence, less than 2% rounded fine ferruginous gravel fragments, pH 8.0. Gradual transition to
B22	58-74 cm	Dull reddish brown (5YR4/4) heavy clay, moderate structure, subangular blocky peds 10-20 mm, smooth fabric, moderately firm consistence, less than 2% rounded fine ferruginous gravel fragments, pH 9.0. Clear transition to
B23	74-121 cm	Dull brown (7.5YR5/4) medium clay, a few medium faint reddish brown mottles, strong structure, angular blocky peds 10-20 mm, smooth fabric, very firm consistence, common moderately calcareous nodules, less than 2% fine rounded ferruginous gravel fragments, pH 9.2. Clear transition to
B24	121-157+ cm	Dull orange (7.5YR6/4) medium clay, common medium faint reddish brown mottles, strong structure, angular blocky peds 5-10 mm, smooth fabric, very firm consistence, common highly calcareous nodules, a few fine rounded ferruginous gravel fragments, pH 9.6

Soil classification:

Factual Key (Northcote):	Dr 2.13
Australian Soil Classification:	Calcic, Hypernatric, Red, Sodosol; very deep, medium, silty, non-gravelly
Unified Soil Group:	CH

Interpretation of soil analyses*

Horizon	pH	Gravel %	E.C. (salts)	Nutrient Status	P	K	Al	Organic Matter	Dispersibility
A1	5.8	22.7	VL	L	D	S	T	T	M
B21	8.0	5.6	M	H	D	S	S	S	VH
B22	9.0	8.3	H	H	D	S	S	S	L
B23	9.2	14.0	H	H	D	S	S	S	H
B24	9.6	7.6	H	H	D	S	S	S	H

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)	C₃T₃S₄	Highly susceptible to sheet/rill and gully erosion, high electrical conductivity in subsoil
Effluent disposal (septic tanks)	5	Very slow permeability
Farm dams (earthen)	5	Very dispersible subsoil
Building foundations - slab	3	Moderate slope
Building foundations - stumps/footings	3	Moderate linear shrinkage
Secondary roads	5	Very dispersible subsoil
Urban residential	5	Secondary roads
Rural residential	5	Farm dams, effluent disposal, secondary roads

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