Site IS3
Location: Coromby
Australian Soil Classification: Calcic, Subnatric, Red SODOSOL
General Description: Eroded crest within a plain.
Geology: Quaternary Woorinen Formation: aeolian dune sand, calcareous clay
Soil Profile Morphology:
Surface Soil
| A1 | 0-5 cm | Brown (7.5YR4/4); sandy clay loam; hardsetting surface condition; weak coarse friable granular structure; pH 7.1; sharp and wavy boundary to: |  Calcic, Subnatric, Red Sodosol |
| A2j | 5–15 cm | Brown (7.5YR4/4) sporadically bleached (10YR7/2d); sandy clay loam; weak coarse friable granular structure; pH 6.2; sharp and wavy boundary to: | |
| Subsoil | |||
| B21 | 15–45 cm | Reddish brown (5YR4/4); light clay; plastic; moderate very coarse prismatic structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 7.7; clear and smooth boundary to: | |
| B22 | 45–65 cm | Yellowish brown (10YR5/8); medium clay; plastic; moderate coarse subangular blocky structure; strong consistence dry; sticky consistence wet; very few (<2%) hard carbonate segregations; pH 8.9; sharp and broken boundary to: | |
| B23 | 65–75 cm | Yellowish brown (10YR5/8); medium clay; plastic; very large lenticular structure (slickensides); strong consistence dry; sticky consistence wet; few (2-10%) soft carbonate segregations; rock fragments; pH 9.0: | |
| C | 75+ cm | Impenetrable rock. |  |
| | | |
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 | 0–5 | 7.1 | 6.4 | 0.06 | 0.01 | 3.1 | 0.4 | 0.6 | NA | NA | 2.9 | NA | 4.7 | 45 | 23 | 13 | 14 |
A2j | 5–15 | 6.2 | NA | 0.07 | 0.01 | 2.4 | 0.8 | 0.4 | 0.1 | NA | 3.3 | 13.1 | 4.8 | 43 | 24 | 15 | 16 |
B21 | 15–45 | 7.7 | 6.7 | 0.3 | 0.02 | 11.8 | 12 | 2.5 | 3.3 | NA | 7.1 | NA | 30 | 10 | 6 | 3 | 79 |
B22 | 45–65 | 8.9 | NA | 0.46 | 0.02 | 10.5 | 12.4 | 2.2 | 3.3 | NA | 1.5 | NA | 24 | 20 | 12 | 6 | 62 |
B23 | 65–75 | 9.0 | NA | 0.33 | 0.02 | 6.8 | 9 | 1.6 | 2.6 | NA | 1.0 | NA | 15.9 | 32 | 15 | 8 | 44 |
Management Considerations:
- Strong texture contrasts (16% to 79% clay).
- Neutral upper soil becoming alkaline at depth, high level of nutrients in upper subsoil (B21, B22 horizons).
- Thin surface and subsurface horizon with, poor structure and high coarse sand component.
- Subsurface soil is leached with fewer nutrients than above or below.
- Subsoil is sodic, with sodicity and salinity higher in upper and mid subsoil (B21 and B22 horizons).
- Subsoil is reddish in upper subsoil, indicating relatively free drainage and air movement (oxidising conditions), despite clay percentage.
- Landform element, eroded crest-plain; moderate site drainage.
Profile Described By: John Martin, Nabil Badawy, Ron Cawood, Geoff Pope, John Galea, John Turner (1970).
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