LWA9
Location: Shelford
Australian Soil Classification: Ferric, Eutrophic, Black, DERMOSOL
General Landscape Description: Gently undulating plain.
Site Description: Stubble paddock.
Geology: Quaternary basalt.
 LWA9 Landscape |
Soil Profile Morphology:
Surface Soil
| Ap | 0-12/15 cm | Dark greyish brown (10YR4/2); fine sandy clay loam (gritty); pH 5.3; wavy boundary to: |  LWA9 Profile |
| A12 | 12/15-25 | Dark greyish brown (10YR4/2), sporadically bleached; fine sandy clay loam (gritty); changing to: | |
| Subsoil |  | | |
| B1 | 25-30 cm | Light grey (10YR7/1) with strong brown (7.5YR4/6) mottles; fine sandy clay loam (gritty); contains very many (80%) ferro-manganiferous (2-5 mm in size) nodules. NOTE: The B1 horizon is discontinuous – probably associated with gilgai depressions. | |
| B21 | 30-50 cm | Very dark greyish brown (10YR3/2) with few (5-10%) diffuse light olive brown (2.5Y5/6) mottles; also with strong brown (7.5YR4/6) mottles associated with overlying B1 horizon where present; medium heavy clay; moderate coarse to very coarse prismatic structure, parting to moderate very coarse blocky structure; strong consistence dry; contains many (20%) ferromanganiferous nodules; pH 6.8; changing to: | |
| B/C | 50+ cm | Basalt stones and boulders (80%); pH 8.3. |
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (Ap horizon) | Strongly Acid | Low | Sodic | None1 |
Subsoil (B21 horizon) | Slightly Acid | Low to Medium | Strongly Sodic | Strong2 |
Deeper Subsoil (at 50+ cm) | Moderately Alkaline | Low to Medium | Strongly Sodic | - |
- 1 Moderate to strong dispersion after remoulding. 2 Complete dispersion after remoulding.
| The surface is strongly acid. The subsoil is slightly acid becoming moderately alkaline with depth. | | Salinity rating increases from low in the surface to medium in the subsoil. | | The surface is sodic becoming strongly sodic in the subsoil. | | Clay content increases at the surface / subsoil boundary. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC (dS/m) | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
Ap | 0-12/15 | 5.3 | 4.5 | 0.16 | 3.6 | 3.9 | 0.20 | 1.3 |
B21 | 12/15-50 | 6.8 | 5.9 | 0.21 | 6.3 | 12 | 0.38 | 4.3 |
B/C | 50+ | 8.3 | 7.4 | 0.46 | 7.6 | 19 | 0.4 | 7.8 |
Horizon | Horizon Depth (cm) | Acidity meq/100g | Oxidisable Organic Carbon % | Total Nitrogen % | Exchangeable Aluminium mg/kg | 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) |
Ap | 0-12/15 | 10 | 2.1 | 0.16 | 25 | 24.2 | 10.2 | 26 | 33 | 12 | 27 |
B21 | 12/15-50 | 6.1 | 0.77 | 0.07 | 39 | 39.2 | 20.2 | 7 | 31 | 21 | 39 |
B/C | 50+ | | | | | 46.4 | 22.7 | 12 | 21 | 21 | 41 |
Profile Described By: Mark Imhof (January 2007).
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