SW65
Location: Simpson
Australian Soil Classification: Reticulate, Mesotrophic, Brown CHROMOSOL
General Landscape Description: Gently undulating plain (plateau).
Site Description: Flat plain above gentle slope, dairy pasture.
Geology: Hanson Plain Sand
SW65 Lanscape
Soil Profile Morphology:
Surface Soil
| Ap | 0-15 cm | Very dark grayish brown (10YR3/2 moist), dark grayish brown (10YR4/2 dry); loamy fine sand; apedal; very weak consistence; pH 5.3; diffuse change to: |  SW65 Profile Note: Surface (Ap) horizon has been stripped from soil profile |
| Subsoil |  | | |
| B1 | 15-40 cm | Dark yellowish brown (10YR4/6 moist), yellowish brown (10YR5/8 dry); clay loam, moderate root channels; firm consistence; pH 5.7; clear change to: | |
| B21 | 40-65 cm | Dark yellowish brown (10YR4/6 moist), yellowish brown (10YR5/8 dry); sandy clay loam; moderately pedal; diffuse change to: | |
| B22 | 65-100 cm | Dark yellowish brown (10YR4/6 moist and dry); medium to heavy clay; slight, strong brown (7.5YR4/6 moist) mottling; very friable; very firm consistence; pH 5.8; gradual change to: | |
| BC | 100 cm+ | Gray (N6/1 moist) and dusky red (7.5R3/4 moist), red (10R4/8 moist) and yellowish brown (10YR5/8 moist) reticulate mottling ("Tiger Mottles"); medium to heavy clay. |
Notes:
- A further profile 200 m east of SW65 was photographed. This had similar overall characteristics but also had very strongly cemented, ferruginised coarse sand at 1.5 m plus. There was little or no ironstone in the upper part of the profile however.
- A2 or B1 horizons are an irregular feature of this soil.
Key Profile Features:
- Strong texture contrast between upper horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (A1 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B1 horizon) | Moderately Acid | Very Low | Non-Sodic | None |
Deeper subsoil (at 65-100 cm) | Moderately Acid | Very Low | Non-Sodic | None |
| The surface is strongly acid. The subsoil is moderately acid. | | Salinity rating is low throughout the profile. | | The soil is non sodic throughout. | | Exchangeable Aluminium levels are high in the subsoil. |
Horizon | Sampling Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Organic Carbon % | Nitrogen % | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||||
meq/100g | ||||||||||
A1 | 0-10 | 5.3 | 4.7 | 0.12 | 6.5 | 0.21 | 2.8 | 0.3 | 0.19 | 0.1 |
B1 | 15-40 | 5.7 | 5.1 | 0.06 | | | 1.9 | 1.4 | 0.1 | 0.11 |
B22 | 65-100 | 5.8 | 5.3 | 0.07 | | | 1.3 | 6.4 | 0.15 | 0.55 |
Horizon | Sampling Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | 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 | 0-10 | 39 | 11 | 19.2 | 7 | 24.2 | 46.6 | 14 | 9 |
B1 | 15-40 | <10 | 5.7 | 20.3 | 8.9 | 19.6 | 42.2 | 11.5 | 25.5 |
B22 | 65-100 | <10 | 9.1 | 34.1 | 23.3 | 10 | 20.3 | 5. | 63 |
Profile Described By: Richard McEwan (March 1999).
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