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26 Yellow and brown sodic and strongly sodic mottled textue contrast soils on Palaeozoic sediments

These soils occur in the Western Uplands south of Ballarat and on the north-eastern edge of the CMA where rainfall is quite high, but where drier the soils are sodic.

These soils have shallow surface organic loamy sand to sandy loam soils sometimes underlain by conspicuously bleached subsurface (A2) horizons, or a clear change at about 20–30cm into a pale sodic slightly mottled (red) silty medium clay subsoil, which grades into weathered thinly bedded sediments between 60 cm to 100 cm on upper slopes and at greater than 100 cm on lower slopes. Lower slopes and colluvial slopes have darker subsoils (pale brown) which are still mottled and more likely to be texture contrast than those soils on higher topographic positions on (weathered) rock.

Notable characteristics include: high silt content, erosion prone, acidic and hence low nutrient availability, generally shallow organic surface soil, texture contrast on most slopes but deeper on lower slopes. The subsoils are often sodic, increasing their susceptibility to erosion.
CLRA Soil Unit 26

Soil Sites

Site Code
Soil-landform unit
1:100 000 mapsheet
Mid slopeMelanic, Subnatric, Red SodosolDr3.63T7722 - Bacchus Marsh
Lower slopeMesotrophic, Subnatric, Yellow SodosolDy3.51T7622 - Ballarat
CrestFerric, Mottled-Subnatric, Brown SodosolDy3.41T7622 - Ballarat
Mid slopeFerric, Bleached-mesonatric, Brown SodosolDy3.42T7622 - Ballarat
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