SW74
| Location: Tullah | Australian Soil Classification: Bleached-Vertic, Eutrophic, Brown CHROMOSOL |
| General Landscape Description: Undulating low hills | Site Description:Waxing upper slope, western aspect |
| Geology: Thin Tertiary (Dilwyn or Eastern View Formation) over Cretaceous (Otway Group) unconformity | |
 SW74 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-15 cm | Very dark greyish brown (10YR3/2 moist), dark grey (10YR4/1 dry); loamy sand; apedal; hardsetting; pH 54; clear change to: |  SW74 Profile - Note: Surface (A1) horizon has been stripped from the soil profile |
| A2 | 15-40 cm | Olive brown (2.5Y4/3 moist), conspicuously bleached (2.5Y6/3 dry); sandy loam; apedal, massive, faint mottling and few medium ferruginous nodules; pH 5.6; sharp and wavy change to: | |
| Subsoil |  | | |
| B21t | 40-70/80 cm | Sandy yellowish brown (10YR5/6) coarse angular blocky peds with dark greyish brown (10YR4/2) thick heavy clay coatings; some peds dominantly clay; vertic features; pH 6.0; gradual and wavy change to: | |
| B22tg | 80-140 cm+ | White (grey N8/? moist) clay with grey (10YR5/1 moist) coatings; red mottles in white clay; strongly vertic; pH 5.5. This horizon is probably a palaeosol developed on Otway Group sediments. |
Key Profile Features:
- Conspicuously bleached subsurface (A2) horizon
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Very Low | Non-Sodic | None |
Deeper subsoil (at 140+ cm) | Strongly Acid | Very Low | Non-Sodic | None |
 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-15 | 5.4 | 4.7 | 0.14 | | 2.6 | 0.97 | 0.37 | 0.27 |
A2 | 25-35 | 5.6 | 4.8 | 0.05 | | 0.74 | 0.91 | 0.05 | 0.14 |
B21t | 45-65 | 6 | 5.3 | 0.08 | | 1.9 | 5.2 | 0.08 | 0.49 |
B22tg | 100-120 | 5.5 | 4.4 | 0.08 | | 1.4 | 8.2 | 0.11 | 0.8 |
Horizon | Horizon Depth (cm) | Ex Al mg/kg | Ex Ac meq/100g | Field pF2.5 | Wilting Point pF4.2 | Coarse Sand (0.2- 2.0 mm) | Fine Sand (0.02- 0.2 mm) | Silt (0.002- 0.02 mm) | Clay (<0.002 mm) |
A1 | 0-15 | 21 | 13 | 22.2 | 9.5 | 38.7 | 34.8 | 10.5 | 8.5 |
A2 | 25-35 | 15 | 5.3 | 13.7 | 4.2 | 45.8 | 27.5 | 13 | 10 |
B21t | 45-65 | <10 | 7.3 | 28.4 | 18.6 | 37.1 | 7.6 | 3.5 | 48 |
B22tg | 100-120 | | 13 | | | | | | |
Management Considerations:
Notes
- Possible unconformity of Palaeocene over Cretaceous.
- Strongly vertic with trench collapse.
- This site stood out from adjacent sections of the trench, because of white subsoil material in trench spoil.
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