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Marong map unit Qbr

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

Map Unit:Quaternary basalt, very gentle slope, rockyMap Unit Symbol:Qbr
% of Study Area: 2.7

Land-form diagram for Marong map unit Qbr

General Description:
These very gentle slopes with greater than 40% rock outcrop occur at random on the basaltic plain. The associated soils are reddish brown clay loam which vary in depth but are commonly very shallow. Red duplex and gradational soils that occur on the non rocky very gentle slopes sometimes occur in deep pockets between the rocks. The rocks are occasionally cleared to allow cultivation.

Site characteristics:

Parent material age: QuaternaryDepth seasonal watertable:> 5 m
Lithology: BasaltPotential recharge to groundwater:Very high
Landform Pattern:Lava plainFlooding risk:Nil
Element:SlopeDrainage:Rapidly drained
Slope common:2 %Depth to hardrock: 0.2 m
Slope range: 0-3 %
Rock outcrop: 40-50%

Major vegetation: Yellow Box, Grey Box, Long-leaf Box, Buloke, Lightwood, Kangaroo Grass, Wallaby Grass, Capeweed

Present land use: Grazing - sheep


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




Soil profile characteristics:

Permeability (measured - average, range):2070, 1161 - 3091 mm/day
Permeability (estimated):-
Available water capacity:38 mm H2O
Linear shrinkage (B horizon):N.A. (Low - estimated)

Soil profile description:

A0 -12 cmDark reddish brown (5YR3/3) clay loam, weak structure, subangular blocky peds 2-5 mm, smooth fabric, moderately firm consistence, a few coarse basalt fragments, moderate organic matter content, pH 6.0. Clear transition to
C12 + cmRock


Soil classification:

Factual Key (Northcote):Um6.43 (major), Dr2.13 (minor)
Australian Soil Classification:Lithic, Leptic, Rudosol; shallow, medium, clay loamy, non-gravelly
Unified Soil Group: CL


Interpretation of soil analyses*

Horizon
pH
Gravel
%
E.C.
(salts)
Nutrient
Status
P
K
Al
Organic
Matter
Dispersibility
A
6.0
6.3
VL
L
D
S
S
M
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)
C3T2S5
Shallow depth to hardrock, very low available water capacity, high gravel/stone/boulder content
Effluent disposal (septic tanks)
5
Shallow depth to hardrock, very rapid permeability – risk of polluting groundwater
Farm dams (earthen)
5
Shallow depth to hardrock, very low suitability of subsoil, very rapid permeability
Building foundations - slab
5
Shallow depth to hardrock
Building foundations - stumps/footings
5
Shallow depth to hardrock
Secondary roads
5
Shallow depth to hardrock
Urban residential
5
Secondary roads, building foundations
Rural residential
5
Farm dams, effluent disposal, secondary roads, building foundations


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A Land Capability Study of the Rural City of Marong - map unit Qbr - (PDF - 37.7 KB)
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