SW35
Location: Larpent
Australian Soil Classification: Humose (& Vertic), Eutrophic, Black CHROMOSOL
Map Unit: Map Unit 136 (Maher and Martin, 1987).
General Landscape Description: Lower slope of a gently undulating rise.
Site Description: Grazing paddock (dairy).
Geology: Quaternary - Newer volcanics (scoria and tuff).
 SW35 Landscape |
Soil Profile Morphology:
Surface Soil
| A11 | 0-20 cm | Black (10YR2/1); clay loam; moderate coarse blocky, parting to moderate medium blocky, parting to strong fine polyhedral structure; very firm consistence dry; pH 6.0; gradual change to: |  SW35 Profile |
| A12 | 20-35 cm | Black (10YR2/1), light brownish grey (10YR6/2) dry; clay loam; strong medium blocky, parting to strong fine polyhedral structure; firm consistence moist; pH 5.8; wavy change to: | |
| A2 | 35-45 cm | Very dark greyish brown (10YR3/2); clay loam; contains many (30%) ferromanganiferous gravels (2-10 mm in size); pH 6.2; wavy change to: | |
| Subsoil |  | | |
| B21 | 45-65 cm | Black (10YR2/2); medium clay; moderate coarse prismatic, parting to strong coarse blocky and strong fine lenticular structure; small slickensides present; strong consistence dry; pH 6.5; wavy change to: | |
| B22 | 65-90 cm | Black (10YR2/1); light clay; strong coarse prismatic, parting to strong coarse blocky structure; firm consistence moist; contains many (30%) weathered tuff fragments; pH 7.3; wavy change to: | |
| B/C | 90+ cm | Black (10YR2/1); silty clay; moderate medium blocky, parting to strong fine blocky structure; contains many (60%) weathered tuff fragments; pH 7.9 |
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (A11 horizon) | Moderately Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None1 |
Deeper subsoil (at 90+ cm) | Slightly Alkaline | Low | Sodic | None2 |
- 1. Moderate dispersion after remoulding. 2. Strong dispersion after remoulding.
 The surface horizon is moderately acid. The subsoil is slightly acid becoming slightly alkaline at 70 cm depth. |  The salinity rating is low to very low throughout the profile. |  The surface and upper subsoil is non-sodic. The subsoil becomes sodic at about 80 cm depth. |  The clay content increases markedly at 45 cm depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC (dS/m) | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A11 | 0-20 | 6 | 5.4 | 0.19 | 15 | 5.9 | 0.8 | 0.2 |
A12 | 20-35 | 5.8 | 5.1 | 0.16 | 12 | 4.9 | 0.8 | 0.2 |
A2 | 35-45 | 6.2 | 5.3 | 0.09 | 5.1 | 3.5 | 0.6 | 0.2 |
B21 | 45-65 | 6.5 | 5.5 | 0.11 | 8.5 | 11 | 1.5 | 1.1 |
B22 | 65-90 | 7.3 | 6.2 | 0.11 | 8.2 | 15 | 0.8 | 2.5 |
B/C | 90+ | 7.9 | 6.8 | 0.13 | | | | |
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) |
A11 | 0-20 | | 4.6 | 0.36 | 36 | 17.5 | 8 | 38 | 18 | 24 |
A12 | 20-35 | | 3.3 | 0.25 | 31.5 | 13.9 | 9 | 42 | 17 | 23 |
A2 | 35-45 | | | | 25.2 | 8.8 | 13 | 48 | 16 | 20 |
B21 | 45-65 | 15 | 1.5 | 0.14 | 50.5 | 31.1 | 5 | 19 | 7 | 65 |
B22 | 65-90 | | | | 46.3 | 24.4 | 14 | 37 | 12 | 31 |
B/C | 90+ | | | | | | 8 | 39 | 29 | 18 |
Profile Described By: Mark Imhof and Austin Brown (August 1998).
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