Marong map units Tsf1, Tsd1, Tsg1
Back to: A Land Capability Study of the Rural City of Marong
| Map Unit: | Tertiary sediments, very gentle slope, gentle crest, drainage depression | Map Unit Symbol: | Tsf1, Tsd1, Tsg1 |
| % of Study Area: | 0.9, 0.01, 0.1 |
General Description:
The Tertiary sediment soils in the Leichardt area are distinguished by their vivid red colour. They are red duplex with dark red loam top soils and red medium to heavy clay subsoils. Yellow mottles and calcium carbonate nodules are common at depth. Ironstone gravel occurs throughout. Because of the very gentle topography of the unit, the soils do not vary significantly between the crests, slopes and drainage lines. This description covers all three units.
Site characteristics:
| Parent material age: | Tertiary | Depth seasonal watertable: | > 2 m |
| Lithology: | Sediments | Potential recharge to groundwater: | Low |
| Landform Pattern: | Gently undulating rises | Flooding risk: | Nil |
| Element: | Slope, drainage depression, crest | Drainage: | Moderately well drained |
| Slope common: | 1% | Depth to hardrock: | > 1.5 m |
| Slope range: | 0 - 3% |  | |
| Rock outcrop: | 0% | | |
Major vegetation: Grey Box, Buloke, Hedge Wattle, Wallaby Grass, introduced grasses
Present land use: Grazing, cropping
| Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
| Susceptibility | Moderate | Moderate | Low | Low | Low |
| Incidence | Moderate | Low | Low | Low | Low |
Soil profile characteristics:
| Permeability (measured - average, range): | 5, 4 - 6 mm/day |
| Permeability (estimated): | |
| Available water capacity: | 265 mm H2O |
| Linear shrinkage (B horizon): | 11.4 % |
Soil profile description:
| A1 | 0 - 18 cm | Brownish black (7.5YR3/2) loam, moderate structure, subangular blocky peds 10-20 mm, smooth fabric, moderately weak consistence, a few organic segregations, a few medium sized rounded ferruginous gravel nodules, pH 7.1. Clear transition to |
| B21 | 18 - 35 cm | Dark reddish brown (2.5YR3/4) medium clay, moderate structure, subangular blocky peds 10-20 mm, smooth fabric, moderately weak consistence, less than 2 % organic segregations, less than 2 % medium sized rounded ferruginous gravel fragments, pH 7.6. Gradual transition to |
| B22 | 35 - 81 cm | Reddish brown (5YR4/6) heavy clay, strong structure, subangular blocky peds 5-10 mm, smooth fabric, moderately weak consistence, less than 2% organic segregations, pH 8.6. Clear transition to |
| B23 | 81 - 146 cm | Reddish brown (5YR4/6) medium heavy clay, common distinct coarse orange mottles, strong structure, subangular blocky peds 5-10 mm, smooth fabric, moderately weak consistence, a few calcareous segregations, common conglomerates of calcium carbonate and ferruginous fine to medium gravel fragments, pH 9.2. Clear transition to |
| B24 | 146+ cm | Brown (10YR4/6) medium heavy clay, common distinct coarse red mottles, strong structure, angular blocky peds 5-10 mm, smooth fabric, moderately firm consistence, common ferruginous segregations, a few medium sized rounded ferruginous gravel nodules, pH 9.3. |
Soil classification:
| Factual Key (Northcote): | Dr 2.13 |
| Australian Soil Classification: | Sodic, Calcic, Red, Chromosol; very deep, medium, 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 |
| A1 | 7.1 | 18.1 | M | M | D | S | S | M | M |
| B21 | 7.6 | 3.9 | H | H | D | S | S | L | M |
| B22 | 8.6 | 1.5 | H | H | D | S | S | VL | M |
| B23 | 9.2 | 28.3 | H | H | D | S | S | VL | M |
| B24 | 9.3 | 6.4 | H | H | D | S | S | VL | M |
Land capability assessment
Land Use | Class | Major limiting feature(s)/ landuse |
| Agriculture (CTS values) | C3T1S3 | Moderately suceptiblit to sheet/rill and gully erosion, moderately dispersible top soil, moderate gravel content, climate |
| Effluent disposal (septic tanks) | 5 | Very slow permeability |
| Farm dams (earthen) | 3 | Moderately shallow depth to bedroack/hardpan, moderate suitability of subsoi, moderate depth to seasonal watertable |
| Building foundations - slab | 3 | Moderate drainage |
| Building foundations - stumps/footings | 3 | Moderate drainage |
| Secondary roads | 3 | Moderate drainage, Universal Soil Group |
| Urban residential | 3 | Secondary roads < building foundations |
| Rural residential | 5 | Effluent disposal |
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