SW47
Location: Toolong
Australian Soil Classification: Humose, Subnatric, Brown SODOSOL
General Landscape Description: Level plain
Site Description: Grazing paddock (dairy).
Mapping Unit: Unit 5 (Maher and Martin, 1987).
Geology: Tertiary sediments.
 SW47 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-20 cm | Black (10YR2/1); fine sandy clay loam; weak to moderate coarse blocky, parting to medium fine blocky structure; weak consistence moist; pH 7.1; clear change to: |  SW47 Profile |
| A2 | 20-30 cm | Pale brown (10YR6/3), conspicuously bleached; fine sandy clay loam; weak medium blocky structure; weak consistence moist; pH 6.7; clear change to: | |
| Subsoil |  | | |
| B21 | 30-45 cm | Dark yellowish brown (10YR4/4); light mediumclay; weak to moderate medium blocky, parting to fine blocky structure; weak consistence moist; contains a few (10-20%) ferruginous nodules (2-10 mm in size); pH 6.4; clear change to: | |
| B22 | 45-60 cm | Dark yellowish brown (10YR4/4); light medium clay; moderate medium polyhedral, parting to fine polyhedral structure; firm consistence moist; pH 6.0; gradual change to: | |
| B23 | 60-80 cm | Dark yellowish brown (10YR4/4) with many yellowish brown (30%) (10YR5/8) and a few yellowish red (5YR5/6) mottles; light medium clay; strong medium blocky, parting to moderate to strong fine blocky structure; shiny faced peds; firm consistence moist; pH 6.1; gradual change to: | |
| B24 | 80+ cm | Dark greyish brown (10YR4/2) with many strong brown (7.5YR5/8) and a few red (2.5YR4/8) and light grey (10YR7/1) mottles; light medium clay; strong medium blocky, parting to moderate to strong fine blocky structure; some dark stains (manganese?); pH 6.2: | |
| D | 120+ cm | Weathered sandstone. |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Slightly Alkaline | Low | Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Low | Sodic | None1 |
Deeper subsoil (at 80+ cm) | Slightly Acid | Low | Sodic | None |
- 1. Complete dispersion after remoulding.
 The surface is slightly alkaline. The subsoil is slightly acid. |  The surface is slightly alkaline. The subsoil is slightly acid. |  The profile is sodic throughout. |  The clay content increases markedly at 30 cm depth. |
Chemical and Physical Analysis:
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Exchangeable Cations | Coarse Sand (0.2-2.0 mm) % | Fine Sand (0.02-0.2 mm) % | Silt (0.002-0.02 mm) % | Clay (<0.002 mm) % | Field Capacity % w/w | Wilting Point % w/w | |||
Ca | Mg | K | Na | |||||||||||
meq/100g | ||||||||||||||
A1 | 0-20 | 7.1 | 6.2 | 0.13 | 6.9 | 1.9 | 0.4 | 1.6 | 24 | 36 | 8 | 22 | 24 | 13.6 |
A2 | 20-30 | 6.7 | 5.5 | 0.12 | 2.2 | 1.2 | <0.1 | 0.6 | 30 | 39 | 8 | 21 | 16.6 | 8.2 |
B21 | 30-45 | 6.4 | 5.5 | 0.18 | 3.2 | 3 | <0.1 | 1 | 20 | 23 | 5 | 51 | 27.4 | 18 |
B22 | 45-60 | 6 | 5.5 | 0.21 | 3.1 | 4.1 | 0.1 | 0.8 | 12 | 13 | 5 | 69 | 35.1 | 24.5 |
B23 | 60-80 | 6.1 | 5.7 | 0.2 | 3.1 | 4.9 | 0.1 | 0.7 | 7 | 12 | 5 | 75 | 39 | 27.3 |
B24 | 80+ | 6.2 | 5.7 | 0.16 | 2.9 | 5 | <0.1 | 0.7 | 8 | 15 | 6 | 71 | 37.5 | 25.9 |
Profile Described By: Mark Imhof and Austin Brown, August 1998.
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