SW24
Location: Simpson
Australian Soil Classification: Haplic, Mesotrophic, Brown KANDOSOL
Map Unit: Tomahawk Creek Land System (Pitt, 1981).
General Landscape Description: Grazing paddock (dairy).
Site Description: Lower slope in rolling hills landscape.
Geology: Tertiary - Neogene Hanson Plain Sand Formation (Lateritised sand and clay).
 SW24 Landscape |
Soil Profile Morphology:
Surface Soil
| A11 | 0-5 cm | Dark brown (7.5YR3/4); sandy loam; weak consistence moist; pH 5.4; abrupt change to: |  SW24 profile |
| A12 | 5-15 cm | Dark reddish brown (2.5YR3/4); coarse sandy loam; apedal; weak consistence moist; pH 5.2; clear change to: | |
| A13 | 15-30 cm | Red (2.5YR4/6); coarse sandy loam; apedal; weak consistence moist; contains a few (5%) quartz fragments (2 - 3 cm in size); pH 5.4; clear change to: | |
| Subsoil | |||
| B21 | 30-60 cm | Strong brown (7.5YR5/8); sandy clay loam; weak coarse blocky structure; weak consistence moist; contains a few (2-5 %) ferruginous fragments (5-15 cm in size); pH 6.2; gradual change to: | |
| B22 | 60-90 cm | Strong brown (7.5YR5/8); sandy clay loam; weak coarse blocky structure; pH 6.1; sharp change to: | |
| C | 90+ cm | Laterite. | |
Soil Profile Characteristics:
 | pH | Salinity Rating | ||
Surface (A11 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (at 60-90 cm) | Slightly Acid | Very Low | Non-Sodic | None |
 |
| The surface soil is strongly acid. The subsoil is slightly acid. | | The salinity rating in the surface is low and becomes very low in the subsoil. | | The 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 | ||||||||
A11 | 0-5 | 5.4 | 4.6 | 0.12 | 0.05 | 0.05 | 0.05 | 0.05 |
A12 | 5-15 | 5.2 | 4.4 | 0.07 | 1.6 | 0.2 | 0.1 | 0.05 |
A12 | 15-30 | 5.4 | 4.6 | <0.05 | 0.7 | 0.05 | 0.1 | 0.05 |
B21 | 30-60 | 6.2 | 5.9 | 0.06 | 1.5 | 0.3 | 0.4 | 0.05 |
B22 | 60-90 | 6.1 | 6 | <0.05 | 0.9 | 1.2 | 0.1 | 0.05 |
Horizon | Horizon Depth (cm) | Exchangeable 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 | 0-5 | | 5.3 | 0.39 | 20 | 14 | 51 | 26 | 4 | 10 |
A12 | 5-15 | | | | 13 | 6 | 51 | 29 | 4 | 12 |
A12 | 15-30 | | | | 10 | 5 | 52 | 29 | 3 | 13 |
B21 | 30-60 | 4.8 | | | 16 | 10 | 50 | 20 | 2 | 29 |
B22 | 60-90 | | | | 17 | 11 | 54 | 11 | 1 | 31 |
Profile Described By: Mark Imhof and Austin Brown (May 1998).
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