Site: SFS 16 | Land Unit: Basalt Alluvium |
Aust. Soil Class.: Haplic, Self-mulching; Black VERTOSOL (confidence level 1) |
General Land Unit Description: This land unit consists of the smaller swamps and depression which occur on the basalt plains. Grey Vertosols tend to dominate the smaller swamps and depressions on the plains. On the other hand, Black Vertosols are commonly found in the swamps and depressions associated with the stony rise landscapes and the larger alluvial plains. Both soil types are typically sodic at depth and imperfectly drained. There are minor occurrences of Sodosols. In some areas of the basalt plain, this land unit would have been incorporated into the basalt land units. |
Geology: Recent alluvial over Quaternary Basalt | Landform pattern: Plain |
Position in landscape: Drainage depression | Internal drainage: Imperfectly drained |
Ap | 0-20 cm | Very dark grey (10YR 3/1); heavy clay; strongly pedal; self mulching surface, polyhedral (2-20 mm); clear boundary to: | |
Subsoil | |||
B21t | 20-60/70 cm | Very dark grey (10YR 3/1); heavy clay; strong prismatic (>30 cm diameter); slickensides at ped bases; clear boundary to: | |
B22ss | 60/70-100/110 cm | Grey (5Y 5/1) with common (20%) fine to medium yellowish brown (10YR 5/6) mottles; heavy clay; prominent slickensides becoming larger (>30 cm) at depth; gradual boundary to: | |
B23ss | 110+ cm | Pale olive (5Y 6/4) with common fine yellowish brown (10YR 5/6) mottles; heavy clay; prominent slickensides. |
Key Profile Features
| Subsoil ped |
pH | Salinity Rating | Sodicity | Dispersion | |
Surface soil (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Upper subsoil (B21 horizon) | Moderately Acid | Low | Non-Sodic | None1 |
Deeper subsoil (at 130+ cm) | Slightly Alkaline | Medium | Sodic | None1 |
Horizon | Horizon Depth | pH (water) | pH CaCl2 | EC dS/m | NaCl % | Exchangeable Cations | Ex Al mg/kg | Ex Ac meq/100g | Field pF2.5 | Wilting Point pF4.2 | Coarse Sand (0.02-0.2mm) | Fine Sand (0.02-0.2mm) | Silt (0.02-0.02mm) | Clay (<0.002mm) | |||
Ca | Mg | K | Na | ||||||||||||||
meq/100g | |||||||||||||||||
Ao | 10 | 6.0 | 5.3 | 0.23 | 16 | 18 | 0.68 | 1.5 | 11 | 21 | 56.1 | 35.6 | 1.7 | 9.6 | 13.5 | 63.0 | |
B21 | 50 | 6.6 | 5.6 | 0.16 | 15 | 21 | 0.84 | 2.2 | 16 | 58.9 | 33.2 | 0.3 | 8.5 | 17.5 | 66.5 | ||
B22 | 90 | 7.5 | 6.8 | 0.41 | 0.07 | 15 | 26 | 0..7 | 4.4 | 57.9 | 39.8 | 0.3 | 7.7 | 11.5 | 75.0 | ||
B23 | 130 | 7.6 | 7.1 | 0.81 | 0.14 | 13 | 25 | 0.9 | 4.8 | 0.2 | 6.9 | 10.0 | 74.0 |