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Soil/Landform Unit 132

Landform Unit Description

Unit 132 image a
Looking north twoards the minor basalt rise near Pitfield
      Area: 252 ha
      0.02% of CMA region

      The undulating basalt rise near Pitfield has a well developed regolith profile within the Western Plains. This undulating rise may have some stone on the surface on the gentle crests and upper slopes. The soils are texture contrast with a shallow surface horizon over sodic medium to heavy clay subsoils. Poorly drained equivalents with conspicuous bleach are also found on slopes. Well structured red texture contrast soils are found on upper slopes and the crest. Local relief is less than 30 m with no developed drainage network. No significant vegetation has been observed on this rise. The land use is extensively cropping and grazing (mainly sheep). Land degradation issues include waterlogging and overland flow due to the low relief and sometimes hardsetting surfaces.
Unit 132 geomorphology

Unit 132 image b
Surrounding plains at Pitfield		Unit 132 cross section

Unit 132 graph

Component
1
2
Proportion of soil-landform unit
65%
35%
CLIMATE
Rainfall (mm)

Annual: 620
Temperature (oC)
Minimum 8, Maximum 19
Precipitation less than potential evapotranspiration
October-March
GEOLOGY
Age and lithology
Geomorphology
LANDUSE
Cleared areas: Sheep grazing; cropping (cereal)
TOPOGRAPHY
Landscape

Undulating basalt rise
Elevation range (m)
203-255
Local relief (m)
30
Drainage pattern
-
Drainage density (km/km2)
-
Landform
Undulating plains
Landform element
Long gentle slopes
Plains
Slope and range (%)
3 (1-5)
1 (0-3)
Slope shape
Linear
Straight
NATIVE VEGETATION
Ecological Vegetation Class

Absent
SOIL
Parent material

In situ weathered basalt

In situ weathered basalt
Description
(Corangamite Soil Group)
Mottled brown, grey or yellow texture contrast soils (37) and well structured red texture contrast soils (38)
Alkaline mottled yellow to brown texture contrast soils with poorly drained equivalents (36)
Soil type sites
SFS5b, SW48, MM5075
Surface texture
Fine sandy loam
Sandy loam
Permeability
Moderate
Low
Depth (m)
1.5-2
>2
LAND CHARACTERISTICS, POTENTIAL AND LIMITATIONS
Hardsetting surfaces, dispersible subsoils and slow permeabiity results in overland flow and periodic waterlogging. Overland flow inadvertently causes sheet and rill erosion.
Hardsetting surfaces, dispersible subsoils and slow permeability results in overland flow and periodic waterlogging. Overland flow inadvertently causes sheet and rill erosion.
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