Marong map unit Dgd
Back to: A Land Capability Study of the Rural City of Marong
| Map Unit: | Devonian granodiorite, gentle crest | Map Unit Symbol: | Dgd |
| % of Study Area: | 0.5 |
General Description:
The crests within the gently undulating granodiorite landscape are mostly rock free. Soils are moderately deep yellow duplex with sandy loam topsoils, bleached hardsetting A2 horizons and mottled clay subsoils. The soil profile is underlain by a siliceous hardpan. Uniform sands are associated with the occasional outcropping tors. In the western section of the granodiorite small patches of remnant lateritic material occur on some crests and the associated soils are uniform red clays with coarse, distinct mottling and kaolin occurring at depth.
Site characteristics:
| Parent material age: | Devonian | Depth seasonal watertable: | > 5 m |
| Lithology: | Granodiorite | Potential recharge to groundwater: | Low |
| Landform Pattern: | Undulating low hills | Flooding risk: | Nil |
| Element: | Crest | Drainage: | Well drained |
| Slope common: | 0% | Depth to hardrock: | 0.8 m (variable) |
| Slope range: | 0 - 2% |  | |
| Rock outcrop: | < 5 m | | |
Present land use: Grazing
| Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
| Susceptibility | Low | Low | High | Low | Moderate |
| Incidence | Low | Low | Low | Low | Low |
Soil profile characteristics:
| Permeability (measured - average, range): | 7, 3 - 12 mm/day |
| Permeability (estimated): | |
| Available water capacity: | 146 mm H2O |
| Linear shrinkage (B horizon): | 14.2% |
Soil profile description:
| A1 | 0-9 cm | Greyish yellow brown (10YR 4/2) sandy loam, weak structure, angular blocky peds 10 - 20 mm, rough fabric, very weak consistence, high organic matter, pH 5.0. Clear transition to |
| A21 | 9-23 cm | Dull yellow orange (10YR 6/3) sandy loam, bleached (7.5YR8/4) when dry, weak structure, subangular blocky peds 10 - 20 mm, rough fabric, very weak consistence, pH 5.3. Clear transition to |
| A22 | 23-38 cm | Dull yellow orange (10YR 7/3) sandy loam, bleached when dry, apedal, sandy fabric, loose consistence, common granitic fragments, pH 5.7. Clear transition to |
| B2 | 38-76 cm | Greyish yellow brown (10YR 6/2) heavy clay, many distinct medium sized red mottles, weak structure, subangular blocky peds 20 - 50 mm, smooth fabric, very firm consistence, pH 5.6. Clear transition to |
| B3 | 76-95 cm | Greyish brown (7.5Y5/2) light clay, many faint red coarse mottles, moderate structure, angular blocky peds 10 - 20 mm, smooth fabric, moderately firm consistence, many coarse granitic fragments, pH 5.1 |
| C | 95 cm | Hardpan |
Soil classification:
| Factual Key (Northcote): | Dy 3.41 (major) Gn 1.84, Uc 5.11 (minor) |
| Australian Soil Classification: | Bleached-Sodic, Mesotrophic |
| Unified Soil Group: | CH |
Interpretation of soil analyses*
Horizon | pH | Gravel % | E.C. (salts) | Nutrient Status | P | K | Al | Organic Matter | Dispersibility |
| A1 | 5.0** | 3.1 | VL | VL | D | S | S | H | L |
| A21 | 5.3** | 7.3 | M | VL | D | D | S | L | L |
| A22 | 5.7 | 15.1 | H | VL | D | D | S | L | L |
| B2 | 5.6 | 6.3 | H | M | D | S | S | M | H |
| B3 | 5.1** | 14.4 | H | M | D | S | S | M | H |
Land capability assessment
Land Use | Class | Major limiting feature(s)/ landuse |
| Agriculture (CTS values) | C3T1S4 | Highly susceptible to wind erosion, shallow depth to hardpan, high electrical conductivity in subsoil |
| Effluent disposal (septic tanks) | 5 | Very slow permeability |
| Farm dams (earthen) | 5 | Shallow depth to hardpan |
| Building foundations - slab | 2 | Nil |
| Building foundations - stumps/footings | 3 | Moderate linear shrinkage |
| Secondary roads | 3 | Moderate linear shrinkage, Universal Soil Group |
| Urban residential | 3 | Secondary roads, building foundations |
| Rural residential | 5 | Farm dams, effluent disposal |
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