SW63
| Location: Simpson | Australian Soil Classification: Humose, Sesquic, Aquic PODOSOL (thick sandy surface/clay loamy subsoil) |
| General Landscape Description: Gently undulating plain | Site Description: Flat Plain |
| Geology: Hanson Plain Sand | |
 SW63 Landscape |
Soil Profile Morphology:
Surface Soil
| Ah | 0-50 cm | Black (10YR2/1 moist); loamy sand, apedal; weak consistence; many whitish sand grains; horizon becomes paler; dark grey (10YR4/1) at about 15 cm [but difference is not marked enough to be described as A2]; pH 5.1; abrupt and wavy change to: |  SW63 Profile |
| Subsoil |  | | |
| B21sm | 50-52 cm | Dark brown (10YR3/3) to dark yellowish brown (10YR3/4) light fine sandy clay loam; weakly cemented thin pan; firm consistence; clear change to: | |
| B22s(g) | 52-80/90 cm+ | Mottled light olive brown (2.5Y5/3 moist) pale yellow (2.5Y7/3 dry) and olive yellow (2.5Y6/6); fine sandy clay loam; apedal massive; firm consistence; pH 4.6; diffuse change to: | |
| B23g | 80/90+ cm | Mottled light yellowish brown (2.5Y6/3) light grey (2.5Y7/2 dry) and yellowish brown (10YR5/8); loam; apedal massive; pH 4.6. |
Key Profile Features:
- Thick organic matter rich surface (A1) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Very Strongly Acid | Low | Non-Sodic | None |
Deeper subsoil (at 85+ cm) | Very Strongly Acid | Low | Non-Sodic | None |
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Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A | 0-50 | 5.1 | 3.9 | 0.12 | | 2.8 | 0.52 | 0.55 | 0.31 |
B22s(g) | 50-85 | 4.6 | 4.4 | 0.1 | | 0.09 | 0.1 | <0.05 | 0.23 |
B23g | 85+ | 4.6 | 4.2 | 0.07 | | <0.05 | 0.17 | <0.05 | 0.16 |
Horizon | Horizon Depth (cm) | Ex Al mg/kg | Ex Ac meq/100g | Field 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) |
A | 0-50 | 59 | 19 | 22.5 | 11.4 | 26.1 | 43 | 15 | 3 |
B22s(g) | 50-85 | 160 | 11 | 17.8 | 8.3 | 16.9 | 47.4 | 15.5 | 16.5 |
B23g | 85+ | 170 | 4.9 | 14.3 | 5.4 | 17.5 | 48.4 | 18.5 | 15.5 |
Management Considerations:
Subsoil (B) Horizons
- High level of exchangeable aluminium in very strongly acid subsoil.
- Low level of inherent fertility.
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