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Marong map unit Tfe1

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

Map Unit:Tertiary fan, gentle slope, 1Map 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: OrdovicianDepth seasonal watertable:> 2 m
Lithology: SedimentsPotential recharge to groundwater:Low
Landform Pattern:Undulating risesFlooding risk:Nil
Element:SlopeDrainage: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
Sheet/rill
Gully
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 cmDark 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
B2115-58 cmDull 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
B2258-74 cmDull 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
B2374-121 cmDull 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
B24121-157+ cmDull 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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