SW43
| Location: Laang | Australian Soil Classification: Bleached-Vertic, Eutrophic, Brown KUROSOL |
| General Landscape Description: Gently undulating plain. | Mapping Unit: Unit 40 (Maher and Martin, 1987). |
| Site Description: Grazing paddock (dairy). | Geology: Quaternary - Newer volcanics (basalt). |
 SW43 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-15 cm | Very dark greyish brown (10YR3/2); very fine sandy clay loam; moderate medium blocky, parting to moderate to strong fine polyhedral structure; weak structure moist; contains very few (2%) ferruginous nodules (2-4 mm in size); pH 5.4; clear change to: |  SW43 Profile |
| A21 | 15-30 cm | Brown (10YR5/3), conspicuously bleached; fine sandy clay loam; weak to firm consistence moist; contains a few (5%) ferruginous nodules (2-10 mm in size); pH 5.5; clear change to: | |
| A22 | 30-45 cm | Pale brown (10YR6/3), conspicuously bleached; fine sandy clay loam (heavy); moderate coarse polyhedral, parting to medium polyhedral structure; contains a common (20%) amount of ferruginous nodules (2-5 mm in size); pH 5.8; clear change to: | |
| Subsoil |  | | |
| B21 | 45-60 cm | Yellowish brown (10YR5/4) with a few (10%) strong brown (7.5YR5/6) and brownish yellow (10YR6/6) mottles; mediumclay; moderate medium polyhedral, parting to strong fine polyhedral structure; weak consistence moist; pH 5.4; gradual change to: | |
| B22 | 60-80 cm | Yellowish brown (10YR5/4) with common (15%) strong brown (7.5YR5/6) mottles; medium heavy clay; strong medium polyhedral, parting to strong fine polyhedral structure; some basalt fragments in patches; pH 5.5; clear change to: | |
| B23 | 80+ cm | Greyish brown (2.5Y5/2) with many (20%) yellowish brown (10YR5/8) mottles; medium clay; strong fine to very fine polyhedral structure; pH 5.7. |
Key Profile Features:
- Strong texture contrast between surface (A) horizon and subsoil (B21) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Deeper subsoil (at 80+ cm) | Moderately Acid | Very Low | Non-Sodic | None |
 The surface and upper sub-soil is strongly acid. The subsoil becomes moderately acid at 80 cm depth. |  The salinity rating is low-very low throughout the soil profile. |  The clay content increases markedly at 45 cm depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-15 | 5.4 | 4.7 | 0.12 | 5.5 | 1 | 0.3 | 0.1 |
A21 | 15-30 | 5.5 | 4.8 | 0.9 | 1.7 | 1.5 | 0.1 | 0.05 |
A22 | 30-45 | 5.8 | 4.8 | 0.06 | 1.5 | 2.4 | 0.1 | 0.1 |
B21 | 45-60 | 5.4 | 4.8 | 0.11 | 2.5 | 7.5 | 0.2 | 0.6 |
B22 | 60-80 | 5.5 | 4.8 | 0.12 | 2.7 | 9.4 | 0.1 | 0.9 |
B23 | 80+ | 5.7 | 5 | 0.12 | 2.3 | 8 | 0.1 | 1.1 |
Horizon | Horizon Depth (cm) | 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 | 43.2 | 16.4 | 9 | 32 | 29 | 16 |
A21 | 15-30 | 30.8 | 10.5 | 9 | 34 | 32 | 23 |
A22 | 30-45 | 28.1 | 10.9 | 7 | 35 | 30 | 26 |
B21 | 45-60 | 45.3 | 27.9 | 3 | 15 | 15 | 64 |
B22 | 60-80 | 51 | 32.3 | 1 | 10 | 13 | 73 |
B23 | 80+ | 44.7 | 27 | 3 | 16 | 15 | 65 |
Management Considerations:
Profile Described By: Mark Imhof and Austin Brown, August 1998.
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