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Marong Map unit Ose

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

Map Unit:Ordovician sediments, gentle slopeMap Unit Symbol:Ose
% of Study Area: 17.1

Land-form diagram for Marong map unit Ose

General Description:
This unit is widespread throughout the centre of the study area. The dominant soil types are red duplex with hardsetting fine sandy loam topsoils and sporadically bleached A2 horizons. Yellow mottling occurs occasionally in the medium clay subsoils. Soil variations include fully bleached A2 horizons and gradational yellow brown soils with sporadically bleached A2 horizons. Coarse fragments are common throughout the profile and on the soil surface. The soils are very similar to those on the very gentle slopes and gentle crests and detailed information has been extrapolated from those sites.

Site characteristics:

Parent material age: OrdovicianDepth seasonal
watertable:
> 5 m
Lithology: SedimentsPotential recharge to groundwater:Low
Landform Pattern:Undulating low hillsFlooding risk:Nil
Element:SlopeDrainage:Well drained
Slope common:5%Depth to hardrock: 0.8 m
Slope range:3 - 10%
Rock outcrop: 0%

Major vegetation: Grey Box, Red Box, Yellow Gum, Golden Wattle, Gold-dust Wattle, Hedge Wattle, Round-leaf Wattle, Black-anther Flax-lily, Drooping Cassinia, Spear Grass, Onion Grass

Present land use: Native forest, grazing, residential


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


Soil profile characteristics:

Permeability (measured - average, range):37, 15 - 88 mm/day
Permeability (estimated):-
Available water capacity:122 mm H20
Linear shrinkage (B horizon):14.6 %

Soil profile description:

A10-12 cmDull reddish brown (5YR4/3) fine sandy loam, weak structure, subangular blocky peds 2 - 5 mm, smooth fabric, moderately firm consistence, common subangular sedimentary and quartz gravel fragments, moderate organic matter, pH 6.2. Clear transition to
A212-30 cmHardsetting orange (5YR6/6) loam fine sandy, sporadically bleached when dry, weak structure, subangular blocky peds 5-10 mm, smooth fabric, moderately firm consistence, a few organic segregations, many angular coarse sedimentary fragments, pH 4.7. Clear transition to
B230-60 cmDull reddish brown (5YR4/4) medium clay, weak structure, subangular blocky peds 10 - 20 mm, smooth fabric, very firm consistence, pH 7.3. Gradational transition to
B360-80 cmDull reddish brown (5YR4/4) medium clay, moderate structure, subangular blocky peds 5 - 10 mm, smooth fabric, moderately firm consistence, many subangular sedimentary gravel fragments, pH 9.0. Clear transition to
C80 cm Rock



Soil classification:

Factual Key (Northcote): Dr 2.33 (major), Dr 2.13, Dr 3.41 (minor)
Australian Soil Classification:Subnatric, Red, Sodosol, moderate, medium, loamy, gravelly
Unified Soil Group: CH


Interpretation of soil analyses*

Horizon
pH
Gravel
%
E.C.
(salts)
Nutrient
Status
P
K
Al
Organic
Matter
Dispersibility
A1
6.2
2.6
VL
M
D
S
S
H
L
A2
4.7**
31
VL
VL
D
D
T
H
H
B2
7.3
2.9
M
H
D
S
S
L
VH
B3
9.0
62.9
M
H
D
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)
C3T3S4
Highly susceptible to sheet/rill and gully erosion, shallow depth to hardrock, high
gravel/stone content
Effluent disposal (septic tanks)
4
Slow permeability
Farm dams (earthen)
5
Shallow depth to hardrock, very dispersible subsoil
Building foundations - slab
2
Nil
Building foundations - stumps/footings
3
Moderate linear shrinkage
Secondary roads
5
Very dispersible subsoil
Urban residential
5
Secondary roads
Rural residential
5
Farm dams, secondary roads


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A Land Capability Study of the Rural City of Marong - map unit Ose - (PDF - 39.5 KB)
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