Back to: A Land Capability Study of the Rural City of Marong
Map Unit: | Ordovician sediments, gentle slope | Map Unit Symbol: | Ose |
% of Study Area: | 17.1 |
Parent material age: | Ordovician | Depth seasonal watertable: | > 5 m |
Lithology: | Sediments | Potential recharge to groundwater: | Low |
Landform Pattern: | Undulating low hills | Flooding risk: | Nil |
Element: | Slope | Drainage: | Well drained |
Slope common: | 5% | Depth to hardrock: | 0.8 m |
Slope range: | 3 - 10% | ||
Rock outcrop: | 0% |
Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
Susceptibility | High | High | Low | Low | Moderate |
Incidence | Low | Moderate | Low | Nil | Moderate |
Permeability (measured - average, range): | 37, 15 - 88 mm/day |
Permeability (estimated): | - |
Available water capacity: | 122 mm H20 |
Linear shrinkage (B horizon): | 14.6 % |
A1 | 0-12 cm | Dull reddish brown (5YR4/3) fine sandy loam, weak structure, subangular blocky peds 2 - 5 mm, smooth fabric, moderately firm consistence, common subangular sedimentary and quartz gravel fragments, moderate organic matter, pH 6.2. Clear transition to |
A2 | 12-30 cm | Hardsetting orange (5YR6/6) loam fine sandy, sporadically bleached when dry, weak structure, subangular blocky peds 5-10 mm, smooth fabric, moderately firm consistence, a few organic segregations, many angular coarse sedimentary fragments, pH 4.7. Clear transition to |
B2 | 30-60 cm | Dull reddish brown (5YR4/4) medium clay, weak structure, subangular blocky peds 10 - 20 mm, smooth fabric, very firm consistence, pH 7.3. Gradational transition to |
B3 | 60-80 cm | Dull reddish brown (5YR4/4) medium clay, moderate structure, subangular blocky peds 5 - 10 mm, smooth fabric, moderately firm consistence, many subangular sedimentary gravel fragments, pH 9.0. Clear transition to |
C | 80 cm | Rock |
Factual Key (Northcote): | Dr 2.33 (major), Dr 2.13, Dr 3.41 (minor) |
Australian Soil Classification: | Subnatric, Red, Sodosol, moderate, medium, loamy, gravelly |
Unified Soil Group: | CH |
Horizon | pH | Gravel % | E.C. (salts) | Nutrient Status | P | K | Al | Organic Matter | Dispersibility |
A1 | 6.2 | 2.6 | VL | M | D | S | S | H | L |
A2 | 4.7** | 31 | VL | VL | D | D | T | H | H |
B2 | 7.3 | 2.9 | M | H | D | S | S | L | VH |
B3 | 9.0 | 62.9 | M | H | D | S | S | VL | L |
Land Use | Class | Major limiting feature(s)/ landuse |
Agriculture (CTS values) | C3T3S4 | Highly susceptible to sheet/rill and gully erosion, shallow depth to hardrock, high gravel/stone content |
Effluent disposal (septic tanks) | 4 | Slow permeability |
Farm dams (earthen) | 5 | Shallow depth to hardrock, very dispersible subsoil |
Building foundations - slab | 2 | Nil |
Building foundations - stumps/footings | 3 | Moderate linear shrinkage |
Secondary roads | 5 | Very dispersible subsoil |
Urban residential | 5 | Secondary roads |
Rural residential | 5 | Farm dams, secondary roads |