Victorian Resources Online (archived)
PVI 1
| Site: PVI 1 | Land Unit: Monivae Basalt |
| Aust. Soil Class.: Ferric, Eutrophic, Brown SODOSOL (thick, clay loamy surface) (confidence level 1) | |
 | General Land Unit Description: The level to gently undulating basalt plains between Branxholm and Glenthompson consist of an association of Vertic or Ferric Brown Chromosols and Ferric Brown Sodosols. The Chromosols typically occur on the upper slopes and crests of very slight rises that may have scattered surface boulders, and Sodosols on the lower slopes and depressions. Sodosols or Vertosols, occasionally with a sporadic bleached subsurface horizon, are usually found in open depressions or drainage lines. |
Site Description:
| Slope: 2% | Geology: Quaternary basalt |
| Landform pattern: Gently undulating plain | Position in landscape: Midslope of low rises |
| Internal drainage: Imperfectly drained |
| A11 | 0-10 cm | Dark brown (10YR3/3), fine sandy clay loam, very weak consistence (dry), pH 5.0. Abrupt change to: |  |
| A21 | 10-15 cm | Brown (10YR4/3) conspicuously bleached (10YR7/3dry), fine sandy clay loam, weak consistence (dry), rusty root channel mottling, abrupt change to: | |
| A22 | 15-40 cm | Brown (10YR5/3), conspicuously bleached (10YR7/3dry), fine sandy clay loam, weak consistence (dry), very many (70%) ferruginous nodules (2-10 mm), pH 6.0. Abrupt and wavy change to: | |
| Subsoil | |||
| B21 | 40-50 cm | Yellowish brown (10YR5/4) with many (30%) yellowish red (2.5YR4/6) and brownish yellow (10YR6/8) mottles, medium clay, moderate coarse blocky, parting to strong medium to fine blocky structure, very firm consistence (moist), few (3-5%) ferruginous nodules, pH 6.6. Clear change to: | |
| B22 | 50-90 cm | Brown (10YR4/3) with yellowish brown (10YR5/8) and dark red (2.5YR4/8) mottles, medium clay, moderate to strong coarse blocky, parting to strong medium to fine blocky structure, shiny ped faces, firm consistence (moist), pH 6.9. Abrupt change to: | |
| B23 | 90-120 cm | Light grey (10YR7/1) with yellow (10YR7/8) and dark red (2.5YR4/6) mottles, pH 7.4. Transition to: | |
| B24 | 120+ cm | Grey (5Y6/1) with light yellowish brown (2.5Y6/4) mottles, heavy clay, firm consistence (moist). | |
| Note: Weathered basalt material commences at depths of between 90 to 120 cm in the soil profile. | |||
Key Profile Features
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon
- Conspicuously bleached subsurface (A2 horizon)
- Large amount of ferruginous nodules in subsurface (A2) horizon
pH | Salinity Rating | Sodicity | Dispersion | |
Surface soil (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Upper subsoil (40-50 cm) | Slightly Acid | Low | Marginally Sodic | None1 |
Deeper subsoil (at 90-120 cm) | Slightly Alkaline | Low | Sodic | Moderate-Strong |
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 | |||||||||||||||||
A11 | 0-10 | 5.0 | 4.1 | 0.24 | 4.9 | 2.5 | 0.47 | 030 | 22 | 43.2 | 16.0 | 7.9 | 30.0 | 24.5 | 28.0 | ||
A22 | 15-40 | 6.0 | 4.8 | 0.05 | 3.0 | 1.8 | 0.11 | 0.29 | <10 | 25.9 | 12.1 | 16.2 | 30.7 | 24.0 | 27.0 | ||
B21 | 40-50 | 6.6 | 5.1 | 0.08 | 3.9 | 6.9 | 0.14 | 1.6 | 11 | 44.2 | 28.3 | 3.0 | 12.2 | 11.0 | 73.5 | ||
B22 | 50-90 | 6.9 | 5.5 | 0.09 | 4.4 | 7.7 | 0.14 | 1.6 | 9.9 | 50.4 | 29.7 | 7.6 | 11.7 | 12.5 | 67.5 | ||
B23 | 90-120 | 7.4 | 6.8 | 0.24 | 7.5 | 16 | 0.14 | 4.5 | <10 | 59.2 | 37.1 | 1.5 | 7.8 | 15.0 | 75 | ||
