Marong map unit Dga
Back to: A Land Capability Study of the Rural City of Marong
| Map Unit: | Devonian granodiorite, crest | Map Unit Symbol: | Dga |
| % of Study Area: | 0.6 |
General Description:
Crest positions within the rolling low hills of the granodiorite, characterised by large numbers of outcropping tors. The soils are dominantly shallow uniform coarse sands with dark brown sandy loam top soils. Profile depth varies considerably. Small pockets of deeper duplex soils can occur between the tors.
Site characteristics:
| Parent material age: | Devonian | Depth seasonal watertable: | > 10 m |
| Lithology: | Granodiorite | Potential recharge to groundwater: | Very high |
| Landform Pattern: | Undulating/rolling low hills | Flooding risk: | Nil |
| Element: | Crest | Drainage: | Rapidly drained |
| Slope common: | 0% | Depth to hardrock: | 0.4 m (variable) |
| Slope range: | 0 - 2% |  | |
| Rock outcrop: | 20 - 40% | | |
Major vegetation: Long-leaf Box, Yellow Box, Blackwood, Lightwood, Black Wattle, Buloke, Grey Box, Austral Bracken
Present land use: Partially forested, sheep grazing (major), residential (minor)
| Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
| Susceptibility | Low | Low | Moderate | Low | Low |
| Incidence | Low | Low | Moderate | nil | Low |
Soil profile characteristics:
| Permeability (measured - average, range): | 20080, 12923 - 29580 mm/day |
| Permeability (estimated): | - |
| Available water capacity: | 64 mm H2O |
| Linear shrinkage (B horizon): | Low (estimate) |
Soil profile description:
| A | 0 - 10 cm | Dark red brown (5YR 3/2) sandy loam, apedal, sandy fabric, loose consistence, high organic matter, pH 5.5 Clear transition to |
| C | 10 - 40 cm | Dull red brown (5YR 4/4) clayey sand, apedal, sandy fabric, loose consistence, a few quartz fragments pH 5.4 |
| 40+ cm | Rock |
Soil classification:
| Factual Key (Northcote): | Uc 1.23 (major) Dy 3.41 (minor) |
| Australian Soil Classification: | Arenic Rudosol; shallow thin loamy, non-gravelly |
| Unified Soil Group: | SM |
Interpretation of soil analyses*
Horizon | pH | Gravel % | E.C. (salts) | Nutrient Status | P | K | Al | Organic Matter | Dispersibility |
| A | 5.5** | 21.2 | VL | L | D | S | T | H | L |
| C | 5.4** | 29.0 | VL | VL | D | S | T | L | L |
Land capability assessment
Land Use | Class | Major limiting feature(s)/ landuse |
| Agriculture (CTS values) | C3T1S5 | Very high gravel/stone/boulder content,shallow depth to hardrock |
| Effluent disposal (septic tanks) | 5 | Shallow depth to hardrock, excessive permeability – risk of polluting groundwater |
| Farm dams (earthen) | 5 | Shallow depth to hardrock, very low suitability of subsoil, excessive permeability |
| Building foundations - slab | 4 | Shallow depth to hardrock |
| Building foundations - stumps/footings | 4 | Shallow depth to hardrock |
| Secondary roads | 4 | Shallow depth to hardrock |
| Urban residential | 4 | Secondary roads, building foundations |
| Rural residential | 5 | Farm dams, effluent disposal |
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