SW58
| Australian Soil Classification: Humose, Kurosolic, Redoxic HYDROSOL | General Landscape Description: Dissected Tertiary sediments, undulating low hills |
| Site Description: Flat, valley floor | Geology: Gellibrand Marl-derived quaternary alluvium overlying Tertiary sediments |
 SW57 and SW58 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-30 cm | Very dark brown (10YR2/2 moist and 10YR5/2 dry); clay loam; weakly pedal; medium (10-20 mm) polyhedral structure; weak consistence; pH 5.9; clear and smooth change to: |  SW58 Profile - Note: Surface (A1) horizon has been stripped from the soil profile |
| Subsoil |  | | |
| B21 | 30-45 cm | Black (10YR2/1 moist and 10YR4/1 dry); with reddish yellow (5YR6/8 moist) mottles common (mainly in root channels); medium clay; coarse polyhedral, parting to medium blocky structure; weak consistence; pH 5.3; abrupt and smooth change to: | |
| B22g | 45-75 cm | Dark grey (10YR4/1 moist) with brownish yellow (10YR6/8 moist) mottles common; medium clay; medium (20-50 mm) prismatic, parting to medium (10-20 mm) blocky structure; firm consistence; pH 5.5; clear and smooth change to: | |
| B23g | 75 cm+ | Grey (10YR5/1 moist) with many reddish yellow (7.5YR6/8 moist) mottles; sandy clay; very coarse (100-300 mm) prismatic structure, (larger at depth), parting to very coarse (50-100 mm) and coarse (20-50 mm) blocky structure; very firm consistence; pH 5.8; strong sulphidic smell (i.e. anaerobic). |
Mole channel
Key Profile Features:
- Strong texture contrast between surface (A1) horizon 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 75-130 cm) | Moderately 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 | |||||||||
A1 | 0-30 | 5.9 | 5.4 | 0.22 | | 12 | 2.8 | 0.4 | 0.46 |
B21 | 30-45 | 5.3 | 4.5 | 0.16 | | 8.2 | 5.2 | 0.38 | 0.8 |
B22 | 45-75 | 5.5 | 4.6 | 0.11 | | 5.1 | 5.2 | 0.34 | 0.71 |
B23 | 75-130 | 5.8 | 4.8 | 0.1 | | 3.4 | 3.8 | 0.23 | 0.54 |
B23g | 130-150 | 5.8 | 5 | 0.15 | | | | | |
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) |
A1 | 0-30 | <10 | 13 | 35.8 | 15.4 | 5 | 46 | 21 | 19 |
B21 | 30-45 | 140 | 18 | 39.4 | 22.2 | 5 | 20 | 21 | 46 |
B22 | 45-75 | 110 | 12 | 35.5 | 23.5 | 9 | 28 | 20 | 40 |
B23 | 75-130 | 22 | 5.4 | 25.1 | 13.4 | 13 | 39 | 23 | 26 |
B23g | 130-150 | | | | | | | | |
Management Considerations:
Whole Profile
- The soil profile will be saturated for a number of months during most years. Drainage will be required for agricultural use.
Subsoil (B) Horizons
- Additional subsoil horizon sampled at profile 10 m east of SW41 to ensure adequate coverage of soil variability at this site.
- Exchangeable aluminium levels are reasonably high in the strongly acid upper subsoil. This may restrict the growth of aluminium sensitive species.
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