Site IS4
Location: Coromby
Soil Type: Minor Type A
Australian Soil Classification: Haplic, Self-Mulching, Grey VERTOSOL
Northcote Factual Key: Ug 5.2
Great Soil Group: grey clay
General Description: Plain within a gently undulating plain.
Geology: Quaternary Woorinen Formation: aeolian dune sand, calcareous clay
Soil Profile Morphology:
Surface Soil
| A1 | 0-10 cm | Very dark greyish brown (10YR3/2) sandy clay; plastic; cracking and self-mulching surface condition; weak subangular blocky structure; strong consistence dry, sticky consistence wet; pH 7.6; sharp change to: |  |
| Subsoil | | ||
| B21 | 10-30 cm | Dark grey (7.5YR4/0) heavy clay; plastic; moderate subangular blocky structure; strong consistence dry, sticky consistence wet; pH 7.6: | |
| B22 | 30-60 cm | Dark grey (7.5YR4/0) heavy clay; plastic; moderate subangular blocky structure; strong consistence dry, sticky consistence wet; pH 8.1; gradual change to: | |
| B31 | 60-90 cm | Greyish brown (2.5Y5/2) heavy clay; plastic; moderate subangular blocky structure; strong consistence dry, sticky consistence wet; pH 8.5: | |
| B32 | 90-120 cm | Greyish brown (2.5Y5/2) heavy clay; plastic; moderate subangular blocky structure; strong consistence dry, sticky consistence wet; pH 8.7. | |
Soil Profile Characteristics:
Horizon | Sample Depth cm | pH | EC dS/m | Sodium Chloride % | Exchangeable Calcium cmol-/kg | Exchangeable Magnesium cmol-/kg | Exchangeable Potassium cmol-/kg | Exchangeable Sodium cmol-/kg | Exchangeable Aluminium mg/kg | Exchangeable Acidity cmol-/kg | Field Capacity -30okPa | Permanent Wilting Point -1500okPa | Coarse Sand % | Fine Sand % | Silt % | Clay % | |
H2O | CaCl2 | ||||||||||||||||
A1 | 0–10 | 7.6 | NA | 0.11 | 0.01 | 13 | 5.8 | 1.4 | 0.1 | NA | 6.2 | NA | 14.7 | 29 | 22 | 8 | 39 |
B21 | 10–30 | 7.6 | NA | 0.28 | 0.04 | 21.7 | 8.8 | 1.9 | 0.5 | NA | 6.1 | NA | 25.3 | 14 | 13 | 9 | 62 |
B22 | 30–60 | 8.1 | NA | 0.41 | 0.08 | 22.3 | 9.3 | 1.7 | 1.5 | NA | 2.2 | NA | 25.6 | 15 | 12 | 9 | 63 |
B31 | 60–90 | 8.5 | NA | 0.64 | 0.12 | 19.8 | 10.1 | 1.6 | 3.3 | NA | NA | NA | 30.8 | 16 | 12 | 9 | 60 |
B32 | 90–120 | 8.7 | NA | 0.76 | 0.13 | 18.3 | 10.5 | 1.5 | 4.1 | NA | NA | NA | 26.0 | 15 | 12 | 8 | 60 |
Management Considerations:
- Cracking clay profile, lighter surface soil.
- Neutral thin surface soil and upper subsoil, increasingly alkaline below upper subsoil.
- Massive surface, with sand. Some structure and possible self-mulching in places.
- High calcium percentage in subsoil; decreasing with depth.
- Subsoil is sodic and salinity increases at depth, particularly below 60 cm.
- Cracking may allow air and seasonal moisture to penetrate.
- Very strong consistence when dry, implications for compaction and implement use.
- Landform element, flat: poor site drainage.
Profile Described By: John Martin, Nabil Badawy, Ron Cawood, Geoff Pope, John Galea, John Turner (1970).
Reference: "Major Agricultural Soils of the Wimmera Irrigation Area". John Martin, Mark Imhof, Lourey Ruth, Rob Nink, Karen DePlater, Paul Rampant, Sonia Thompson, S. Alexander. Department of Natural Resources and Environment, Victoria. 1996.
© State of Victoria (Agriculture Victoria) 1996 - .
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