Marong map unit Tff1
Back to: A Land Capability Study of the Rural City of Marong
| Map Unit: | Tertiary fan, very gentle slope, 1 | Map Unit Symbol: | Tff1 |
| % of Study Area: | 0.1 |
General Description:
These very gentle Tertiary fans have the same soils as the gentle fans (Tfe1), the only difference between the two units is slope. Soils are deep red duplex with loam top soils and heavy red clay subsoils which become brown and mottled with depth. The soils are well structured and calcium carbonate nodules occur deep in the profile.
Site characteristics:
| Parent material age: | Ordovician | Depth seasonal watertable: | > 2 m |
| Lithology: | Sediments | Potential recharge to groundwater: | Low |
| Landform Pattern: | Undulating rises | Flooding risk: | Nil |
| Element: | Slope | Drainage: | Moderately well drained |
| Slope common: | 2% | Depth to hardrock: | > 1.6 m |
| Slope range: | 1 - 3% |  | |
| Rock outcrop: | < 2 % | | |
Major vegetation: Grey Box, Yellow Box, Red Ironbark, Red Gum, Lightwood, Hedge Wattle, Wallaby Grass, Oxalis, Onion Grass, Moss, rushes
Present land use: Grazing (major), cropping (minor)
| Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
| Susceptibility | Moderate | Very high | Low | Low | Moderate |
| Incidence | Moderate | Low | Low | Low | Low |
Soil profile characteristics:
| Permeability (measured - average, range): | 5, 3 - 8 mm/day |
| Permeability (estimated): | |
| Available water capacity: | 265 mm H2O |
| Linear shrinkage (B horizon): | 14.6% |
Soil profile description:
| A | 0-15 cm | Dark reddish brown (5YR3/2) loam, strong structure, subangular blocky peds 5-10 mm, smooth fabric, moderately firm consistence, a few fine rounded ferruginious gravel fragments, pH 5.8 Clear transition to |
| B21 | 15-58 cm | Dull reddish brown (5YR4/4) heavy clay, moderate structure, subangular blocky peds 10-20 mm, smooth fabric, moderately firm consistence, less than 2% rounded fine ferruginous gravel fragments, pH 8.0. Gradual transition to |
| B22 | 58-74 cm | Dull reddish brown (5YR4/4) heavy clay, moderate structure, subangular blocky peds 10-20 mm, smooth fabric, moderately firm consistence, less than 2% rounded fine ferruginious gravel fragments, pH 9.0. Clear transition to |
| B23 | 74-121 cm | Dull brown (7.5YR5/4) medium clay, a few medium faint reddish brown mottles, strong structure, angular blocky peds 10-20 mm, smooth fabric, very firm consistence, common moderately calcareous nodules, less than 2% fine rounded ferruginous gravel fragments, pH 9.2. Clear transition to |
| B24 | 121 -157+ cm | Dull orange (7.5YR6/4) medium clay, common medium faint reddish brown mottles, strong structure, angular blocky peds 5-10 mm, smooth fabric, very firm consistence, common highly calcareous nodules, a few fine rounded ferruginous gravel fragments, pH 9.6 |
Soil classification:
| Factual Key (Northcote): | Dr 2.13 |
| Australian Soil Classification: | Calcic, Hypernatric, Red Sodosol; very deep, medium, silty, non-gravelly |
| Unified Soil Group: | CH |
Interpretation of soil analyses*
Horizon | pH | Gravel % | E.C. (salts) | Nutrient Status | P | K | Al | Organic Matter | Dispersibility |
| A | 5.8 | 22.7 | VL | L | D | S | T | H | M |
| B21 | 8.0 | 5.6 | M | H | S | S | S | L | VH |
| B22 | 9.0 | 8.3 | H | H | S | S | S | L | L |
| B23 | 9.2 | 14.0 | H | H | S | S | S | L | H |
| B24 | 9.6 | 7.6 | H | H | S | S | S | L | H |
Land capability assessment
Land Use | Class | Major limiting feature(s)/ landuse |
| Agriculture (CTS values) | C3T2S5 | Very susceptible to gully erosion |
| Effluent disposal (septic tanks) | 5 | Very slow permeability |
| Farm dams (earthen) | 5 | Very dispersible subsoil |
| Building foundations - slab | 3 | Moderate drainage |
| Building foundations - stumps/footings | 3 | Moderate drainage, moderate linear shrinkage |
| Secondary roads | 3 | Moderate drainage, moderate linear shrinkage, Universal Soil Group |
| Urban residential | 3 | Secondary roads, building foundations |
| Rural residential | 5 | Farm dams, effluent disposal |
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A Land Capability Study of the Rural City of Marong - map unit Tff1 - (PDF - 40 KB)
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