|Sodosols have a strong texture contrast between surface (A) horizons and subsoil (B) horizons and the subsoil horizons are sodic. Using the Australian Soil Classification, Sodosols can be grouped further (Suborder) based on the colour of the upper 20 cm of the subsoil i.e. red, brown, yellow, grey and black. These can be further differentiated based on subsoil characteristics (Great Groups) such as the level of sodicity (in the upper B horizon) and the presence of carbonate or lime (Subgroup).|
Sodosols are widespread in the Goulburn-Broken Catchment Management Region. However, they are generally found on the extensive Riverine Plains north of the uplands (and the Hume Highway) and the low hills and rises east of Heathcote. Surface soil textures and depth vary considerably and have significant implications for management; affecting soil workability, permeability, crop establishment, moisture availability and erodibility. The subsoils are sodic and the yellow, grey and brown Suborders in particular, are generally quite dense and coarsely structured, characterised by coarse prismatic, columnar or blocky peds. They also disperse when wet, resulting in restricted root and water movement through the profile.
Brown Sodosol near Dookie
|Sodosols in the Goulburn Broken Region|
This broad scale map presents an overview and should only be used as a general indication of the distribution of Sodosols in the Goulburn Broken Region. It shows areas where Sodosols are most likely to occur within the region. Note that other soil types may also occur within these mapped areas although they are likely to be a more minor component.
Sodosols in the Goulburn Broken Region
This map has been developed from work done by DPI's former Centre for Land Protection Research as part of the Goulburn Broken Dryland Regional Development Project. This work utilised existing surveys, remote sensing information and some additional field work to develop an updated 1:100 000 soil/landform coverage across the region.
Soils are difficult to map at this broad scale because of their diversity. Even in relatively small areas, a number of soils may occur which relate to differences in topography and landscape position. Variation in some of the major soil profile properties can also occur within these mapped areas. Any agricultural enterprise should be based on a proper on-site assessment of the soil and landscape.
A number of soil surveys have been completed in this region at varying scales and intensity. However, in some areas very little soil survey has taken place (see the Soil and Land Survey Director).