SW54
| Location: Corriemungle | Australian Soil Classification: Acidic, Eutrophic, Grey DERMOSOL |
| General Landscape Description: Gleyed soil on alluvial fan/toe slope of landslide | Geology: Quaternary alluvium derived from Gellibrand Marl |
 SW54 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-15 cm | Very dark greyidh brown (10YR3/2 moist, 10YR5/3 dry); fine sandy loam; weak medium (<20 mm) polyhedral structure, pH 5.7; abrupt and smooth change to: |  SW54 Profile - Note: A1 horizon has been stripped from the soil profile |
| A2 | 15-35 cm | Grey (2.5Y6/1 moist), conspicuously bleached (2.5Y7/2 dry); clay loam; apedal; strong consistence, pH 5.4; abrupt and smooth change to: | |
| Subsoil |  | | |
| B21g | 35-80 cm | Grey (2.5Y5/1 moist) with (~15%), yellowish brown (10YR5/6 moist) mottles common; light clay; fine (<10 mm) polyhedral structure; very firm consistence, pH 5.2; diffuse and smooth change to: | |
| B22g | 80-130 cm | Grey (2.5Y5/1 moist) with many (~25%), yellowish brown (10YR5/6 moist) mottles; medium clay; coarse [50 mm] polyhedral or angular blocky, parting to coarse to medium (20-40 mm) polyhedral structure; pH 5.2; diffuse and smooth change to: | |
| B23gss | 130 cm+ | Dark grey (2.5Y4/1 moist) with a few (~10%) yellowish brown (10YR5/6 moist) mottles; heavy clay; coarse (50 mm) polyhedral or angular blocky, parting to coarse to medium (20-40 mm) polyhedral structure; slickensides (up to 10 cm); pH 5.4. |
Key Profile Features:
- Gradual increase in texture (i.e. clay content) down the soil profile.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Moderately Acid | Low - Medium | Non-Sodic | None |
Subsoil (B21 horizon) | Strongly Acid | Low | Sodic | None |
Deeper subsoil (at 80+ cm) | Strongly Acid | Low-Medium | Sodic | None |
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Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-15 | 5.7 | 5.1 | 0.44 | 0.09 | 8.3 | 3.7 | 0.6 | 0.8 |
A2 | 15-35 | 5.4 | 4.5 | 0.19 | | 2.7 | 3.2 | 0.44 | 1.2 |
B21 | 35-80 | 5.2 | 4.4 | 0.25 | | 3.2 | 4.9 | 0.41 | 1.6 |
B22 | 80-130 | 5.2 | 4.4 | 0.26 | 0.06 | 3.7 | 6.5 | 0.2 | 1.5 |
B23 | 130+ | 5.4 | 4.5 | 0.23 | | | | | |
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 | <10 | 14 | 42.2 | 15.8 | 7 | 31 | 27 | 22 |
A2 | 15-35 | 170 | 10 | 28.6 | 12 | 2 | 44 | 25 | 26 |
B21 | 35-80 | 270 | 11 | 31.8 | 32.2 | 2 | 40 | 21 | 36 |
B22 | 80-130 | 180 | 9.2 | 14.6 | 16.5 | 1 | 35 | 19 | 42 |
B23 | 130+ | | | | | | | | |
Management Considerations:
Whole Profile
- The high exchangeable aluminium levels measured in the strongly acid soil profile (below surface horizon) are likely to restrict the growth of aluminium sensitive species.
- The subsoil is slightly sodic but does not disperse. The high levels of exchangeable aluminium are likely to prevent dispersion occurring.
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