SW21
Location: Simpson
Australian Soil Classification: Humose-Acidic, Dystrophic, Grey DERMOSOL
Map Unit: Simpson Land System (Pitt, 1981).
General Landscape Description: Grazing paddock (dairy).
Site Description: Gently undulating plain 'grass-tree country'
Geology: Tertiary - Neogene Hanson Plain Sand Formation.
 SW21 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-20 cm | Black (10YR2/1); fine sandy loam; weak coarse blocky, parting to medium blocky structure; weak to firm consistence moist; pH 4.9; clear change to: |  SW21 Profile |
| A2 | 20-40 cm | Dark greyish brown (10YR4/2); some rusty root channel mottling present; light fine sandy clay loam; weak to moderate medium polyhedral structure; firm consistence moist; very few (<1%) ferromanganiferous nodules (5 mm size); pH 4.8; clear change to: | |
| Subsoil | |||
| B1 | 40-60 cm | Dark greyish brown (10YR4/2) with yellowish brown (10YR5/8) and light yellowish brown (10YR6/4) mottles; fine sandy clay loam; weakly structured; very firm consistence moist; pH 4.8; gradual change to: NOTE: some mixing from horizon above. | |
| B21 | 60-90 cm | Light brownish grey (10YR6/2) with yellowish brown (10YR5/8) mottles; light clay; weak coarse blocky, parting to moderate medium blocky structure; firm consistence moist; pH 4.7; gradual change to: | |
| B22 | 90+ cm | Light brownish grey (10YR6/2) with yellowish brown (10YR5/8) mottles; light medium clay; weak coarse blocky, parting to moderate medium blocky structure; very few (1%) iron nodules (5-10 mm size) and quartz fragments (2-3 mm size); pH 4.6. | |
Soil Profile Characteristics:
 | pH | Salinity Rating | ||
Surface (A1 horizon) | Very Strongly Acid | Moderate | Non-Sodic | None |
Subsoil (B21 horizon) | Very Strongly Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (at 90+ cm) | Very Strongly Acid | Very Low | Non-Sodic | None |
| The whole profile is very strongly acid throughout. | | The salinity rating in the surface soil is moderate. The subsoil is very low. | | The clay content increases gradually with depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH CaCl2 | EC (dS/m) | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-20 | 4.9 | 4.3 | 0.22 | 6.2 | 0.7 | 0.4 | 0.1 |
A2 | 20-40 | 4.8 | 4.1 | 0.1 | 0.7 | 0.5 | 0.05 | 0.05 |
B1 | 40-60 | 4.8 | 4.2 | 0.08 | 0.4 | 0.3 | 0.05 | 0.05 |
B21 | 60-90 | 4.7 | 4.1 | 0.08 | 0.3 | 0.4 | 0.05 | 0.05 |
B22 | 90+ | 4.6 | 4 | 0.1 | 0.3 | 0.6 | 0.05 | 0.05 |
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 | 0-20 | | 8.7 | 0.49 | 31 | 20 | 26 | 36 | 11 | 10 |
A2 | 20-40 | | | | 19 | 8 | 25 | 40 | 15 | 14 |
B1 | 40-60 | 8.2 | | | 18 | 7 | 26 | 40 | 14 | 17 |
B21 | 60-90 | 6.6 | | | 20 | 8 | 24 | 39 | 10 | 24 |
B22 | 90+ | | | | 22 | 11 | 21 | 34 | 15 | 31 |
Profile Described By: Mark Imhof and Austin Brown (May 1998).
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