Location: Fish Creek Landcare Group. | Australian Soil Classification: Vertic, Eutrophic, Brown KUROSOL |
Northcote Factual Key: Dy 3.41. | Great Soil Group: soloth. |
Geology: Cretaceous mudstone at a depth of 1.5 metres. | General Landscape Description: Midslope of a low undulating rise (1-2% slope). |
Soil Mapping Unit: Koonwarra. | General Site Description: On grassed verge of farm track. |
Native Vegetation: Messmate (Eucalyptus obliqua), Blackwood (A. melanoxylon). |
Site SG11 Landscape |
A1 | 0-15 cm | Dark greyish brown (10YR4/2); fine sandy clay loam; hardsetting surface condition; strong polyhedral structure; very firm consistence dry; pH 6.3; abrupt and wavy change to: | Site SG11 Profile |
A2 | 15-45 cm | Light brownish grey (10YR6/2) conspicuously bleached (10YR7/2d); fine sandy clay loam; strong consistence dry; rusty root channel mottling present; pH 5.8; clear and wavy change to: | |
Subsoil | |||
B21 | 45-70 cm | Brown (10YR5/3) with brownish yellow (10YR6/8) mottles; medium heavy clay; strong coarse prismatic, breaking down to strong coarse blocky structure; very strong consistence dry; pH 5.3; gradual change to: | |
B22 | 70+ cm | Light brownish grey (10YR6/2) with brownish yellow (10YR6/8) mottles; medium clay; strong coarse prismatic, breaking down to strong coarse blocky structure; firm consistence moist; slickensides present; pH 5.2. | |
NOTE: In some areas the fine sandy clay loam A2 horizon may be absent and the surface A1 horizon lies directly over the medium heavy clay subsoil. The sample was taken from across paddock. |
The soil profile is mainly strongly acid throughout. The subsurface (A2) horizon here is moderately acid. | Soluble salt levels are very low throughout the profile. | The exchangeable aluminium levels become high in the strongly acid subsoil. | There is an abrupt textural change at the A/B horizon boundary. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-15 | 6.3 | 5.6 | 0.10 | 13 | 2.0 | 0.2 | 0.2 |
A2 | 15-45 | 5.8 | 4.8 | 0.09 | 2.5 | 1.5 | 0.1 | 0.2 |
B21 | 45-70 | 5.3 | 4.3 | 0.10 | 6.3 | 8.2 | 0.4 | 0.6 |
B22 | 70+ | 5.2 | 4.2 | 0.12 | 2.2 | 9.0 | 0.4 | 1.1 |
Horizon | Horizon Depth (cm) | Exchange- able Aluminium mg/kg | Exchange- able Acidity meq/100g | Field Capacity 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 | 0-15 | <10 | - | 32 | 14 | 9 | 30 | 32 | 20 |
A2 | 15-45 | - | - | 24 | 8 | 9 | 33 | 37 | 21 |
B21 | 45-70 | 260 | 18.0 | 45 | 26 | 4 | 10 | 18 | 63 |
B22 | 70+ | 170 | 22.8 | - | - | - | - | - | - |