SW59
| Australian Soil Classification: Sesquic, Semiaquic PODOSOL | Great Soil Group: podzol |
| General Landscape Description: Upper slope crest in dissected plain | Geology: Veneer of Tertiary Hanson Plain Sand overlying Gellibrand Marl |
Soil Profile Morphology:
Surface Soil
| A1 | 0-15 cm | Black (2.5Y2.5/1); sandy loam; pH 5.6; smooth change to: |  SW59 Profile - Note: Surface (A1) horizon has been stripped from this profile |
| A2 | 15-30 cm | Intermittent horizon; conspicuously bleached; clear and wavy change to: | |
| Subsoil |  | | |
| B21s | 15/30-60 cm | Mottled yellowish brown (10YR5/8 moist) and very dark greyish brown (10YR3/2 moist); sandy clay loam; weak very fine polyhedral structure; weak to firm consistence (weakly cemented, weak “coffee rock”); pH 5.3; gradual and wavy change to: | |
| B22g | 60-90 cm | Light olive brown (2.5Y5/4 moist) with prominent yellowish brown (10YR7/8 moist) to yellow (10YR5/8 moist) mottles; sandy clay; very coarse (50-100 mm) polyhedral, parting to coarse (20-50 mm) blocky structure; sand coatings (whitish) on the larger ped faces; pH 5.5; clear smooth change to: | |
| B3 | 90 cm+ | Light greenish grey (5GY7/1 moist); heavy clay; brownish yellow (10YR6/8 moist) mottles; very coarse (50-100 mm) polyhedral, parting to coarse (20-50 mm) blocky structure; slickensides (>50 mm) present; pH 6.3. |
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) | Moderately Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Strongly Acid | Low | Non-Sodic | None |
Deeper subsoil (at 90+ cm) | Slightly Acid | Low | - | 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 | 0-30 | 5.6 | 5 | 0.16 | | 5.8 | 0.87 | 0.26 | 0.33 |
| Sporadic A2 not sampled | |||||||||
B21 | 30-60 | 5.3 | 4.5 | 0.08 | | 0.83 | 1 | 0.12 | 0.27 |
B22 | 60-90 | 5.5 | 4.6 | 0.08 | | 1.2 | 2.8 | 0.14 | 0.41 |
B3 | 90+ | 6.3 | 5.2 | 0.14 | | | | | |
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 | 0-30 | <10 | 12 | 19.9 | 9.1 | 24 | 49 | 11 | 9 |
| Sporadic A2 not sampled | |||||||||
B21 | 30-60 | 150 | 11 | 19.6 | 11.3 | 18 | 48 | 2 | 25 |
B22 | 60-90 | 61 | 5.7 | 22.4 | 12.4 | 18 | 44 | 4 | 33 |
B3 | 90+ | | | | | | | | |
Management Considerations:
Whole Profile
- Soil profile likely to be saturated for a number of months during most years.
- Exchangeable aluminium levels are quite high in the strongly acid upper subsoil. This may restrict the growth of aluminium sensitive species
- Contrast gleyed subsoil, sandy clay to heavy clay represents transition from overlying Hanson Plain Sand to underlying Gellibrand Marl.
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