SW30
Location: Yeodene
Australian Soil Classification: Bleached-Ferric, Mesotrophic, Brown CHROMOSOL
Map Unit: Map Unit 9 (Maher and Martin, 1987).
General Landscape Description: Gently Undulating Plain.
Site Description: Grazing paddock (dairy).
Geology: Tertiary - Moorabool Viaduct Formation.
 SW30 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-20 cm | Brown (7.5YR3/2); fine sandy clay loam; weak coarse blocky structure; weak to firm consistence moist; pH 5.2; clear and wavy change to: |  SW30 Profile |
| A21 | 20-30 cm | Pale brown (10YR6/3), conspicuously bleached (10YR8/2d); rusty root channel mottling; light fine sandy clay loam; very weak consistence moist; pH 5.7; clear change to: | |
| A22 | 30-40 cm | Pale brown (10YR6/3), conspicuously bleached (10YR8/2d); light fine sandy clay loam; contains many (40%) ferruginous nodules (2-20 mm in size); pH 6.3; abrupt change to: | |
| Subsoil |  | | |
| B21 | 40-70 cm | Dark yellowish brown (10YR4/4) with dark red (2.5YR4/6) and brownish yellow (10YR6/8) mottles; medium clay; moderate coarse blocky, parting to strong medium blocky, parting to fine blocky structure; strong consistence moist; pH 6.3; gradual change to: | |
| B22 | 70-90 cm | Brown (10YR5/3) with many dark red (2.5YR4/8) and brownish yellow (10YR6/8) mottles; medium clay (silty); moderate coarse blocky, parting to strong medium, parting to fine blocky structure; strong consistence moist; pH 6.4; gradual change to: | |
| B23 | 90+ cm | Brown (10YR5/3) with red (2.5YR4/8), brownish yellow (10YR6/8) and light brownish grey (10YR6/2) mottles; medium clay; strong medium polyhedral structure; strong consistence moist; contains ferruginised sandstone fragments; pH 6.4. |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
- Conspicuously bleached subsurface (A2) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (A1 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (at 90+ cm) | Slightly Acid | Very Low | Non-Sodic | None |
 The surface horizon is strongly acid. The subsoil is slightly acid. |  The whole profile has a very low salinity rating. |  The clay content increases abruptly at 40 cm depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC (dS/m) | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-20 | 5.2 | 4.6 | 0.1 | 4.3 | 0.3 | 0.2 | 0.05 |
A21 | 20-30 | 5.7 | 4.8 | <0.05 | 1.4 | 0.3 | 0.05 | 0.05 |
A22 | 30-40 | 6.3 | 5.2 | <0.05 | 1.4 | 0.7 | 0.05 | 0.05 |
B21 | 40-70 | 6.3 | 5.6 | 0.09 | 4.7 | 6.1 | 0.1 | 0.4 |
B22 | 70-90 | 6.4 | 5.7 | 0.09 | 3.8 | 7.3 | 0.1 | 0.5 |
B23 | 90+ | 6.4 | 5.8 | 0.1 | 3.2 | 7.4 | 0.05 | 0.5 |
Horizon | Horizon Depth (cm) | Acidity meq/100g | Oxidisable Organic Carbon % | Total Nitrogen % | 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 | 0-20 | | 4.3 | 0.32 | 27.7 | 10.9 | 14 | 45 | 17 | 14 |
A21 | 20-30 | | | | 16.9 | 3.8 | 19 | 53 | 19 | 9 |
A22 | 30-40 | | | | 16.1 | 4.4 | 24 | 48 | 15 | 12 |
B21 | 40-70 | 9.8 | | | 40.6 | 28.8 | 3 | 10 | 5 | 80 |
B22 | 70-90 | | | | 42.3 | 28.3 | 3 | 12 | 4 | 78 |
B23 | 90+ | | | | 40.5 | 28.1 | 4 | 12 | 5 | 75 |
Profile Described By: Mark Imhof and Austin Brown (June 1998).
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