SW70
| Australian Soil Classification: Humose, Sesquic, Semiaquic PODOSOL | General Landscape Description: Undulating low hills |
| Site Description:Waxing upper slope | Geology: Ambiguous: Hanson Plain Sand, Dilwyn Formation (Colac 1:250 000), or Eastern View Formation (Colac 1:50 000) |
 SW70 Landscape |
Soil Profile Morphology:
Surface Soil
| Ap | 0-20/25 cm | Very dark greyish brown (10YR3/2 moist), greyish brown (10YR5/2 dry); loamy sand; apedal; pH 5.3; diffuse change to: |  SW70 Profile |
| A2 | 30-90/110 cm | Greyish brown (10YR5/2 moist), conspicuously bleached (10YR7/2 dry); sand; sporadic gravel band (>100 mm); with dark very medium to coarse (5-15 mm) nodules with manganiferous centres; very weak to weak consistence; pH 5.4; abrupt change to: | |
| Subsoil |  | | |
| B21s | 90/110-150 cm | Brown (7.5YR4/4 moist and dry) and brownish yellow (10YR6/8 moist) to yellow (10YR7/8 dry); sandy clay loam; cemented sand, ("coffee rock"); massive; firm to strong consistence; clear change to: | |
| B22g | 150-200 cm | Yellowish brown (10YR5/8 moist) (50%) and light greenish grey (5GY7/1 moist) (50%); very dark greyish brown (10YR3/2 moist) coatings; sandy light clay; pH 6; clear change to: | |
| B23 | 200 cm+ | Mottled yellowish brown (10YR5/8 moist) (30%) and light greenish grey (5GY7/1 moist) (70%); apedal. |
Key Profile Features:
- Very thick conspicuously bleached subsurface (A2) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (85 cm) | Moderately 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 | 0-10 | 5.3 | 4.6 | 0.25 | | 2 | 1.1 | 0.44 | 0.72 |
A2 | 30-50 | 5.4 | 4.6 | 0.07 | | 0.27 | 0.13 | <0.05 | 0.18 |
BS | 65-85 | 5.8 | 4.9 | 0.08 | | 1.3 | 1.9 | 0.09 | 0.33 |
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 | 0-10 | 15 | 9.9 | 15.1 | 6.8 | 48.9 | 32.3 | 9 | 5 |
A2 | 30-50 | 11 | 2.1 | 8.2 | 1.2 | 47.8 | 38.3 | 8 | 4.5 |
BS | 65-85 | <10 | 4.1 | 12 | 6 | 45.8 | 31.8 | 3.5 | 17.5 |
Management Considerations:
Notes
- The area is mapped as Tad and Klp but there are great similarities between Tpb and some of the soil profiles. This question needs to be resolved, particularly the Fe sandstone/Fe gravel/Fe colluvial content. Area between creeks is mapped as Klp but soil is same as that East of Christies-Colac Road. General trend is for gravel to disappear from the A2 on these slopes here and for the subsoil structure to become larger, A2/B more variable, more gleyed and strong vertic features.
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