Location: Mount Pollock
Australian Soil Classification: Calcic, Mottled-Mesonatric, Black SODOSOL
General Landscape Description: Undulating low hills/rolling low hills.
Site Description: Simple slope.
Geology: Quaternary-Newer Volcanics.
SW90 Landscape |
A1 | 0-15 cm | Very dark grey (10YR3/1 moist); fine sandy loam; pH 5.5: | SW90 Profile - Note: Surface (A1) horizon has been stripped from soil profile. |
A2 | 15-25 cm | Dark greyish brown (10YR4/2 moist), light brownish grey (10YR6/2 dry); fine sandy loam; weakly pedal; common fine buckshot; pH 6.2; sharp change (thin discontinuous bleached contact) to: | |
Subsoil | |||
B21t | 25-60/70 cm | Very dark grey (10YR3/1 moist); heavy clay; few small yellowish brown (10YR5/8 moist) mottling; very coarse (200 mm) prismatic to columnar (200 mm), parting to coarse prismatic and blocky structure; strong consistence dry; pH 6.6; abrupt boundary to: | |
B22g | 60/70+ cm | Dark greyish brown (10YR4/2 moist) with common (~20%), diffuse, yellowish brown (10YR5/4-5/6 moist) mottles; heavy clay; apedal; common amount of buckshot; large irregular rounded basalt boulders (>60 cm) at unusual angles (possibly colluvial); pH 8.5. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Low | Non Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Low | Strongly Sodic | Complete |
Deeper Subsoil (at 75-90 cm) | Moderately Alkaline | Low - Moderate | Strongly Sodic | Complete |
The surface is strongly acid. The subsoil is slightly acid becoming moderately alkaline at depth. | Salinity rating is low in the surface and upper subsoil becoming low to moderate in the deeper subsoil. | The soil is non sodic in the surface and strongly sodic in the subsoil. | The clay content increases markedly at the A/B boundary. |
Horizon | Sample Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-5 | 5.5 | 4.7 | 0.14 | 3.4 | 3 | 0.5 | 0.59 | |
A2 | 15-25 | 6.2 | 5.1 | 0.1 | 3 | 3.3 | 0.21 | 1.1 | |
B21t | 30-50 | 6.6 | 5.5 | 0.19 | 4.3 | 10 | 0.47 | 3.6 | |
B22g | 75-90 | 8.5 | 7.4 | 0.32 | 0.03 | 3.8 | 9.7 | 0.3 | 5.2 |
120+ | 8.6 | 7.4 | 0.22 | 0.03 |
Horizon | Sample Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | Organic Carbon % | Nitrogen % | 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 | <10 | 11 | 3.6 | 0.27 | 26.6 | 9.7 | 25 | 38 | 17 | 14 |
A2 | 15-25 | <10 | 6.1 | 22.7 | 7.2 | 25 | 39 | 17 | 16 | ||
B21t | 30-50 | 40.2 | 19.6 | 18 | 27 | 11 | 39 | ||||
B22g | 75-90 | 35.9 | 16.2 | 21 | 32 | 11 | 32 | ||||
120+ |