Location: Koonwarra | Australian Soil Classification: Bleached-Mottled, Eutrophic (nearly Magnesic), Brown KUROSOL |
Northcote Factual Key: Dy 3.41 | Great Soil Group: soloth |
Geology: Cretaceous sediments. | General Landscape Description: Crest of a low hill (3-8% slope). |
Soil Mapping Unit: Koonwarra | Site Description: Cleared but uncultivated area near Koonwarra. |
Native Vegetation: Includes Narrow leafed peppermint (Eucalyptus radiata) and Messmate (E. obliqua). |
Site SG7 Landscape |
Surface Soil | Site SG7 Profile | ||
A1 | 0-10 cm | Black (10YR2/1); light silty clay loam; weak blocky structure; hardsetting surface condition; weak consistence moist; pH 5.5; abrupt change to: | |
A2 | 10-25 cm | Greyish brown (10YR5/2) (with some yellowish brown); conspicuously bleached; light silty clay loam; weak coarse blocky structure; very strong consistence dry; pH 5.3; sharp change to: | |
Subsoil | |||
B21 | 25-55 cm | Brown (10YR5/3) with yellowish brown (10YR5/8) mottles; heavy clay; strong coarse prismatic, parting to strong coarse blocky structure; dark stains present on ped faces; very firm consistence moist; pH 5.4; clear change to: | |
B22 | 55-100 cm | Greyish brown (10YR5/2) with strong brown (7.5YR5/8) mottles; heavy clay; strong fine polyhedral structure (with shiny faced peds); pH 5.5; gradual change to: | |
B31 | 100-120 cm | Reddish yellow (7.5YR6/8) with red (2.5YR5/8) mottles; medium heavy clay; contains a band of ferromanganiferous segregations (up to 10 mm size) at 100-110 cm depth; pH 5.4; gradual change to: | |
B32 | 120+ cm | Reddish yellow (7.5YR6/8) and white (10YR8/1); medium heavy clay; pH 5.4. |
The soil profile is strongly acid throughout. | Levels of soluble salts are very low throughout the profile. | Exchangeable aluminium levels become high in the subsoil horizons. | The clay content increases sharply at the A/B horizon boundary, i.e. there is a strong texture contrast between surface and subsoil horizons. |
Horizon Depth (cm) | pH water | pH CaCl2 | EC 1:5 | Exchangeable Cations | Ex. Al mg/kg | Ex. Acidity meq/100g | Wilting Point pF 4.2 | Coarse Sand (0.2 - 2 mm) | Fine Sand (0.02-0.2 mm) | Silt (0.002-0.02 mm) | Clay (<0.002 mm) | ||||
Ca | Mg | K | Na | ||||||||||||
meq/100g | |||||||||||||||
A1 | 0-10 | 5.5 | 4.2 | 0.09 | 3.3 | 2.4 | 0.4 | 0.2 | 30 | 11.1 | 3 | 35 | 42 | 18 | |
A2 | 10-25 | 5.3 | 4.1 | 0.07 | 0.8 | 1.3 | 0.1 | 0.1 | 98 | 8 | 6.9 | 4 | 36 | 43 | 19 |
B21 | 25-55 | 5.4 | 4.1 | 0.08 | 1.9 | 6.7 | 0.5 | 0.8 | 230 | 21.3 | 21.6 | 2 | 16 | 25 | 55 |
B22 | 55-100 | 5.5 | 4.2 | 0.09 | 1.8 | 9.4 | 0.5 | 1.5 | 210 | 29.5 | |||||
B31 | 100-120 | 5.4 | 4.4 | 0.13 | 1.4 | 7.2 | 0.3 | 1.4 | 170 | 16.2 | |||||
B32 | 120+ | 5.4 | 4.3 | 0.17 | 2.1 | 11 | 0.5 | 2.4 | 240 | 15 |