SFS 13
Location: Mt Pollock (west side)
Aust. Soil Class.:Vertic, Mottled-Subnatric, Black SODOSOL
General Landscape Description: Possible alluvial fan below eruption point to east.
Site Description: Approx 300m upslope from SFS3
Geology: Quaternary - Newer Volcanics
 |
Soil Profile Morphology:
| Surface Soil |  SFS 13 | ||
| Ap | 0-15 cm | Grey (10YR 5/1) dry colour with very dark greyish brown (10YR 3/2) mottles; fine sandy clay loam; with minor buckshot; loose friable to very firm ped size, mostly (<10 mm) with many fine primary particles; few coarse peds (strong); pH 6.1; sharp change to: | |
| Subsoil | |||
| B21g | 20-40 cm | Very dark grey (10YR 3/1) with dark yellowish brown (10YR 4/6) mottles (>30%); coarse prismatic, parting to coarse blocky structure; some fine roots in gleyedportion of peds; medium heavy clay; rigid cracks (>3 mm width open to 90 cm depth); pH 6.3: | |
| B22 | 60-80 cm | Very dark grey (5YR 3/1) with grey (10YR 5/1) dry colour and very dark greyish brown (10YR 3/2) mottles at 60 cm; slickensides and lenticular peds; nominally B22ssg, but only based on ss pressure and slight colour change; very occasional pockets of gravelly A2 material at 20 - 40; pH 8.2. | |
Key Profile Features:
- Strong texture contrast between surface (A) horizon and subsoil (B21) horizon.
Soil Profile Characteristics:
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Acid | Low | Marginally Sodic | Slight |
Deeper subsoil (at 1 m) | Marginally Alkaline | Low | Strongly Sodic | Slight - Moderate |
 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
Ap | 0-15 | 6.1 | 5.7 | 0.22 | | 8.5 | 4.8 | 0.47 | 0.72 |
B21 | 20-40 | 6.3 | 5.3 | 0.12 | | 6.7 | 9.9 | 0.81 | 1.6 |
B22 | 60-80 | 8.2 | 7.3 | 0.25 | | 6.7 | 13 | 0.71 | 3.7 |
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) |
Ap | 0-15 | <10 | 10 | 27.7 | 13.1 | 18.1 | 37.3 | 14.5 | 23.5 |
B21 | 20-40 | <10 | 9.3 | 34.9 | 19.3 | 12.8 | 30.6 | 11.5 | 41.5 |
B22 | 60-80 | | | 37.8 | 20.2 | 12.3 | 30.7 | 11.0 | 43.0 |
Management Considerations:
Whole Profile
- Plant available water capacity (PAWC) is considered to be medium (estimated at 103 mm) in the upper 100 cm of this soil profile.
- Profile described by Richard MacEwan, May 1999.
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