SW26
Location: Camperdown.
Australian Soil Classification: Humose, Calcic, Black DERMOSOL (clayey).
Map Unit: Map Unit 2 (Maher and Martin, 1987).
General Landscape Description: Level plain
Site Description: Grazing paddock (dairy).
Geology: Quaternary Newer volcanics (scoria).
 SW26 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-10 cm | Black (10YR2/1); light clay; strong medium polyhedral structure; very firm consistence dry; pH 6.7; clear change to: |  SW26 Profile |
| Subsoil | |||
| B21 | 10-30 cm | Very dark grey (7.5YR3/0); light clay; strong medium polyhedral, parting to strong fine blocky structure; firm consistence moist; pH 7.7; gradual change to: | |
| B22 | 30-60 cm | Very dark grey (10YR3/1); medium clay; strong medium blocky, parting to strong fine blocky structure; very firm consistence moist; pH 8.5; gradual change to: | |
| B23 | 60-100 cm | Very dark grey (10YR3/1); medium clay; strong medium blocky, parting to moderate fine blocky structure; very firm consistence moist; contains a few (5-10 %) calcareous nodules and soft segregations; pH 8.8; gradual change to: | |
| B24 | 100-130 cm | Very dark grey (10YR3/1); medium clay; contains a common (20%) amount of calcareous nodules and soft segregations; pH 8.7; abrupt change to: | |
| C | 130+ cm | Volcanic ash deposits. | |
Key Profile Features:
- Clay texture throughout profile.
Soil Profile Characteristics:
 | pH | Salinity Rating | ||
Surface (A1 horizon) | Slightly Acid | Moderate | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Alkaline | Moderate | Non-Sodic | Strong2 |
Deeper Subsoil (at 1 m) | Strongly Alkaline | Low - Moderate | Sodic | Strong |
2. Complete dispersion after remoulding.
 | |  | |  | |  |
The surface horizon is slightly acid. The upper subsoil is slightly alkaline becoming strongly alkaline at 80 cm depth. | | The surface has a moderate salinity rating. The subsoil is high at 45 cm then decreases with depth. | | The surface is non-sodic. The subsoil becomes sodic at 25-30 cm depth. | | The clay content increases gradually down the profile. |
Horizon | Horizon Depth (cm) | pH (water) | pH CaCl2 | EC (dS/m) | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-10 | 6.7 | 6.2 | 0.4 | | 19 | 11 | 1.7 | 1 |
B21 | 10-30 | 7.7 | 7.1 | 0.38 | 0.04 | 19 | 18 | 4.8 | 2.8 |
B22 | 30-60 | 8.5 | 8.0 | 0.79 | 0.09 | 16 | 21 | 6.8 | 4.7 |
B23 | 60-100 | 8.8 | 8.1 | 0.4 | 0.03 | 13 | 18 | 6.5 | 2.7 |
B24 | 100-130 | 8.7 | 8.2 | 0.37 | 0.02 | 13 | 16 | 5.4 | 2.3 |
C | 130+ | | | | | | | | |
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 | 0-10 | | 10.0 | 0.77 | 63 | 37 | 8 | 15 | 17 | 44 |
B21 | 10-30 | 6.4 | 3.6 | 0.37 | 64 | 40 | 3 | 14 | 32 | 39 |
B22 | 30-60 | | | | 70 | 43 | 1 | 7 | 24 | 57 |
B23 | 60-100 | | | | 61 | 38 | 1 | 5 | 22 | 54 |
B24 | 100-130 | | | | 0 | 34 | 1 | 6 | 10 | 57 |
C | 130+ | | | | | | | | | |
Profile Described By: Mark Imhof and Austin Brown (May 1998).
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