SFS3
Location: Mt Pollock (west side)
Aust. Soil Class.: Vertic (& Ferric), Mottled-Subnatric, Grey SODOSOL
General Landscape Description: Possible alluvialf an below eruption point to east.
Site Description: SFS 'Concept Farm' crop runoff trial site
Geology: Quaternary - Newer Volcanics
 SFS 3 |
Soil Profile Morphology:
| Surface Soil |  SFS 3 | ||
| Ap | 0-10 cm | Dark brown (10YR 3/3 moist) with dark greyish brown (10YR 4/2 dry) mottles; fine sandy clay loam; weakly pedal; very firm consistence; contains many (20-30%) fine ferruginous nodules (magnetic); pH 6.2: | |
| Subsoil | |||
| B21cg | 10 – 75 cm | Dark greyish brown (10YR 4/2 moist) with brownish yellow (10YR 6/6) mottles fine gravelly clay; fine polyhedral structure; shiny ped faces; abundant (>50%), fine buckshot; fragments of basalt up to 100 mm diameter; pH 7.4: | |
| B22 | 75 – 100/110 cm | Brownish yellow (10YR 6/6) with dark grey (10YR 4/1) mottles; infill in earthworm channels; sandy clay; much quartz; very few ferruginous nodules; pH 9.1: | |
| B23ss | 100/110 + cm | Weak red (2.5YR 5/2); gravelly clay; abundant (>50%), fine and coarse buckshot; slickensides (50-100 mm) present; pH 9.0. | |
 Buckshot mottling |  |  Plough pan |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Acid | Low | Non-sodic | None |
Subsoil (B21 horizon) | Slightly Alkaline | Low | Sodic | None1 |
Deeper subsoil (at 1 m) | Strongly Alkaline | Low | Strongly Sodic | Strong |
 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
Ap | 0-10 | 6.2 | 5.6 | 0.21 | | 9.7 | 4.9 | 0.65 | 0.81 |
B21g | 20-40 | 7.4 | 6.2 | 0.15 | | 6.6 | 12 | 1.2 | 2.8 |
B22 | 80-100 | 9.1 | 7.8 | 0.23 | | 4 | 9.4 | 0.47 | 4.3 |
B23 | 100+ | 9 | 7.9 | 0.35 | 0.03 | 5.5 | 13 | 0.7 | 6.5 |
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 | 0-10 | <10 | 9.7 | 31.5 | 14.6 | 15.7 | 38.4 | 13.5 | 28.5 |
B21g | 20-40 | | 7.3 | 40.5 | 20.8 | 22 | 19.2 | 6.5 | 48.5 |
B22 | 80-100 | | 1.5 | 31.7 | 14.5 | 16.4 | 42.2 | 7.5 | 32.5 |
B23 | 100+ | | | 44.9 | 21.3 | 13.5 | 31.1 | 12 | 43 |
Management Considerations:
Whole Profile
- Plant available water capacity (PAWC) is considered to be medium (estimated at 107 mm) in the upper 75 cm of this soil profile. Effective rooting depth (ERD) is restricted to 75 cm due to the highly sodic subsoils (ESP>20).
- Profile described by Richard MacEwan, May 1999.
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