SW34
Location: Cobden.
Australian Soil Classification: Bleached-Vertic, Mesotrophic, Brown CHROMOSOL
Map Unit: Map Unit 164 (Maher and Martin, 1987).
General Landscape Description: Gently undulating rise.
Site Description: Grazing paddock.
Geology: Quaternary - Newer volcanics (basalt).
 SW34 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-10 cm | Dark greyish brown (10YR4/2); silty clay loam; moderate coarse blocky, parting to moderate medium blocky structure; weak consistence moist; pH 5.6; abrupt change to: |  SW34 Profile |
| A21 | 10-25 cm | Yellowish brown (10YR5/4), conspicuously bleached; silty clay loam; pH 5.6; clear change to: | |
| A22 | 25-35 cm | Light yellowish brown (10YR6/4), conspicuously bleached; silty clay loam; contains many (60%) ferruginous nodules (2-10 mm in size); pH 6.0; abrupt change to: | |
| Subsoil | |||
| B21 | 35-50 cm | Yellowish brown (10YR5/6); light medium clay; moderate coarse blocky, parting to strong medium to fine blocky structure; pH 6.1; gradual change to: | |
| B22 | 50-70 cm | Yellowish brown (10YR5/6) with common red (2.5YR5/8) mottles; light medium clay; strong coarse blocky, parting to strong medium blocky structure; pH 6.0; gradual change to: | |
| B23 | 70-100 cm | Greyish brown (10YR5/2) with many yellowish red (5YR5/8) and reddish yellow (7.5YR6/8) mottles; medium clay; strong medium polyhedral, parting to strong fine polyhedral and lenticular structure; pH 6.0; gradual change to: | |
| B3 | 100+ cm | Light grey (10YR6/1) with reddish yellow (5YR5/8) (40%) and strong brown (7.5YR5/8) mottles; medium heavy clay; lenticular structure and slickensides present; 10% coarse fragments; pH 6.0. | |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
 | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (at 1 m) | Slightly Acid | Very Low | _ | None |
 |  |  |
The surface horizon is moderately acid. The subsoil is slightly acid throughout. | The salinity rating is very low throughout the profile. | The clay percentage increases abruptly at 35 cm depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC (dS/m) | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-10 | 5.6 | 4.8 | 0.07 | 2.5 | 0.8 | 0.1 | 0.05 |
A21 | 10-25 | 5.6 | 4.8 | 0.07 | 0.8 | 1.1 | 0.05 | 0.05 |
A22 | 25-35 | 6 | 5.1 | <0.05 | 0.5 | 0.8 | 0.05 | 0.05 |
B21 | 35-50 | 6.1 | 5.3 | 0.09 | 1.8 | 4.8 | 0.05 | 0.6 |
B22 | 50-70 | 6 | 5.3 | 0.11 | 2.1 | 5.5 | 0.05 | 0.8 |
B23 | 70-100 | 6 | 5.4 | 0.11 | 2.3 | 6 | 0.05 | 0.8 |
B3 | 100+ | 6.1 | 5.6 | 0.11 | 2.3 | 5.9 | 0.05 | 0.9 |
Horizon | Horizon Depth (cm) | Acidity meq/100g | Field Capacity 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 | 8.9 | 32 | 9 | 5 | 48 | 21 | 19 |
A21 | 10-25 | | 23 | 7 | 5 | 53 | 27 | 18 |
A22 | 25-35 | | 20 | 6 | 20 | 45 | 21 | 16 |
B21 | 35-50 | | 39 | 25 | 3 | 22 | 10 | 63 |
B22 | 50-70 | | 51 | 34 | 2 | 7 | 4 | 81 |
B23 | 70-100 | | 52 | 36 | 1 | 5 | 4 | 87 |
B3 | 100+ | | 54 | 36 | 2 | 4 | 4 | 87 |
Profile Described By: Mark Imhof and Austin Brown (June 1998).
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