SFS 14
Location: Mt Pollock (west side)
Aust. Soil Class.: Ferric, (& Calcic), Mottled-Mesonatric, Grey SODOSOL
General Landscape Description: Surface run-off/deep drainage pasture plot
Site Description: SFS 'Concept Farm' pasture runoff plot (Tim Johnston)
Geology: Quaternary - Newer Volcanics
 SFS 14 |
Soil Profile Morphology:
| Surface Soil |  | ||
| A1 | 0-15 cm | Dark greyish brown (10YR 4/2), very dark greyish brown (10YR 3/2); fine sandy clay loam; 5-20% bucksot; weakly pedal; many fine roots; pH 5.4; abrupt and wavy change to: | |
| Subsoil | |||
| B21 | 15-55 cm | Greyish brown (10 YR 5/2) to very dark brown (10YR 3/2); with light yellowish brown (10 YR 6/4) to yellowish brown (10YR 5/6) mottles; dry to moist consistence; gravelly medium clay; 20% fine buckshot; coarse prismatic structure (80 - 100 mm) parting to medium polyhedral peds (10-20 mm): | |
| B22k | 55+ cm | Brown (10YR 5/3) to yellowish brown (10YR 5/4); medium clay; 10% fine buckshot; fragments of rounded basalt (up to 200 mm); soft calcareous segregations. | |
Key Profile Features:
- Strong texture contrast between surface (A1) horizon and subsoil (B21) horizon.
Soil Profile Characteristics:
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Alkaline | Low | Strongly Sodic | Strong-Complete |
Deeper subsoil (at 55+ cm) | Very Strongly Alkaline | Low-Medium | Strongly Sodic | Strong |
 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-15 | 5.2 | 4.7 | 0.18 | | 4.6 | 4.1 | .59 | .73 |
B21 | 15-55 | 7.7 | 6.7 | .29 | | 5.4 | 9.2 | .9 | 3.6 |
B22k | 55+ | 9.1 | 8.4 | .61 | | 6.6 | 12 | 1 | 5.4 |
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 | 0-15 | <10 | 11 | 28.2 | 12.7 | 9.8 | 46.8 | 14.5 | 20.5 |
B21 | 15-55 | | | 36.4 | 19.6 | 14.3 | 30.6 | 10.5 | 42 |
B22k | 55+ | | | 41.5 | 20.4 | 10.5 | 25.3 | 10.0 | 44 |
Management Considerations:
Whole Profile
- Plant available water capacity (PAWC) is considered to be medium (estimated at 107 mm) in the upper 100 cm of this soil profile.
- Profile described by Tim Johnston, June 2000.
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