Marong map unit Qbd
Back to: A Land Capability Study of the Rural City of Marong
| Map Unit: | Quaternary basalt, gentle crest, rocky | Map Unit Symbol: | Qbd |
| % of Study Area: | 0.1 |
General Description:
Gently undulating rock outcrop is very common on the basalt plain. The gentle crests and very gentle slopes have similar soil types; shallow, uniform reddish brown clay loams. Basalt fragments are common throughout the profiles. Deeper gradational or duplex soils can occur in deep pockets between the rocks.
Site characteristics:
| Parent material age: | Quaternary | Depth seasonal watertable: | > 5 m |
| Lithology: | Basalt | Potential recharge to groundwater: | Very high |
| Landform Pattern: | Lava plain | Flooding risk: | Nil |
| Element: | Crest | Drainage: | Rapidly drained |
| Slope common: | 0% | Depth to hardrock: | 0.12 m |
| Slope range: | 0 - 2 % |  | |
| Rock outcrop: | 40-50% | | |
Major vegetation: Yellow Box, Grey Box, Long-leaf Box, Buloke, Lightwood, Kangaroo Grass, Wallaby Grass, Capeweed
Present land use: Grazing
| Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
| Susceptibility | Low | Very low | Low | Low | Low |
| Incidence | Low | Low | Low | Low | Low |
Soil profile characteristics:
| Permeability (measured - average, range): | 2070, 1161 - 3091 mm/day |
| Permeability (estimated): | - |
| Available water capacity: | 26 mm H2O |
| Linear shrinkage (B horizon): | N.A. |
Soil profile description:
| A | 0 - 12 cm | Dark reddish brown (5YR3/3) clay loam, weak structure, subangular blocky peds 2-5 mm, smooth fabric, moderately firm consistence, a few coarse basalt fragments, moderate organic matter, pH 6.0. Clear transition to |
| C | 12+ cm | Rock |
Soil classification:
| Factual Key (Northcote): | Um 6.43 (major) Gn 3.12, Dr 2.13 (minor) |
| Australian Soil Classification: | Lithic, Leptic, Rudosol; shallow, medium, clay loamy, non-gravelly |
| Unified Soil Group: | CL |
Interpretation of soil analyses*
Horizon | pH | Gravel % | E.C. (salts) | Nutrient Status | P | K | Al | Organic Matter | Dispersibility |
| A | 6.0 | 6.3 | VL | L | D | S | S | M | M |
Land capability assessment
Land Use | Class | Major limiting feature(s)/ landuse |
| Agriculture (CTS values) | C3T1S5 | Very shallow depth to hardrock, very low available water capacity, high gravel/stone/boulder content |
| Effluent disposal (septic tanks) | 5 | Very shallow depth to hardrock, very rapid permeability – risk of polluting groundwater |
| Farm dams (earthen) | 5 | Very shallow depth to hardrock, lack of clay layers, very rapid permeability |
| Building foundations - slab | 5 | Very shallow depth to hardrock |
| Building foundations - stumps/footings | 5 | Very shallow depth to hardrock |
| Secondary roads | 5 | Very shallow depth to hardrock |
| Urban residential | 5 | Secondary roads, building foundations |
| Rural residential | 5 | Farm dams, effluent disposal, secondary roads, building foundations |
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