Victorian Resources Online (archived)
GP86
| Location: near Lake Glenmaggie. | Australian Soil Classification: Bleached-Mottled, Magnesic, Red KUROSOL (moderate profile depth). |
| Geology: Ordovician sediments. | General Landscape Description: SE aspect, mid slope, hills. |
| Soil Mapping Unit: La Trobe | Site Description: Roadside cutting adjacent to vegetation reserve. |
| Native Vegetation: Stringybark trees (approx. 15 m height). |
 Site GP86 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-5 cm | Black (10YR2/1); loam; pH 4.5: |  Site GP86 Profile |
| A21 | 5-25 cm | Brown (10YR5/3) conspicuously bleached; light sandy loam; hydrophobic; pH 5.0: | |
| A22 | 25-40 cm | Yellowish brown (10YR5/4) conspicuously bleached; sandy loam; pH 5.1: | |
| Subsoil | |||
| B21 | 40-60 cm | Dark red (2.5YR4/6) with reddish yellow (7.5YR6/8) and grey (10YR6/1) mottles; medium heavy clay; moderate medium to fine polyhedral structure; pH 5.1: | |
| C | 60 cm | Weathered sandstone. | |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Very Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon 40-60 cm) | Strongly Acid | Very Low | Non-Sodic | None |
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Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-5 | 4.5 | 3.8 | 0.06 | 1.5 | 0.90 | 0.43 | 0.30 | |
A21 | 5-25 | 5.0 | 4.5 | 0.08 | 0.27 | 0.61 | 0.20 | 0.26 | |
A22 | 25-40 | 5.1 | 4.6 | 0.09 | 0.10 | 0.90 | 0.250 | 0.31 | |
B21 | 40-60 | 5.1 | 4.2 | 0.07 | 0.15 | 4.9 | 0.51 | 0.54 | |
Horizon | Horizon Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable 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 | 0-5 | 82 | 16 | 23 | 50 | 11 | 7 | ||
A21 | 5-25 | 55 | 5.3 | 20 | 57 | 14 | 6 | ||
A22 | 25-40 | 71 | 5.9 | 20 | 52 | 14 | 11 | ||
B21 | 40-60 | 300 | 12 | 14 | 25 | 9 | 50 |
Management Considerations:
Subsoil (B) Horizons
- The subsoil has very low levels of exchangeable calcium compared to exchangeable magnesium (i.e. magnesic). This indicates that nutrient imbalances (e.g. calcium deficiency) may occur.
- The level of exchangeable aluminium becomes quite high in the strongly acid subsoil. This is likely to restrict the growth of aluminium-sensitive species.
- The subsoil horizons are non-sodic and well structured (parting to fine polyhedral peds). This will enhance root and water movement (apart from any chemical restrictions to plant growth).
