Location: Mount Pollock
Australian Soil Classification: Endocalcareous, Self-Mulching, Black VERTOSOL
General Landscape Description: Rolling low hills/undulating low hills
Site Description: Upper slope (waning).
Geology: Quaternary-Basalt Newer Volcanics
SW89-90 Landscape |
Soil Profile Morphology:
A1 | 0-10 cm | Dark brown (7.5YR3/2); self-mulching and cracking surface condition; light clay; very finely pedal; pH 6.8; clear change to: | SW89 Profile - Note: A1 horizon stripped from soil profile. |
Subsoil | |||
B21t | 10-20 cm | Very dark brown (10YR2/2 moist); light medium clay; fine angular blocky, parting to fine to medium polyhedral structure; smooth faced peds; firm consistence moist; pH 7; clear change to: | |
B22t(ss) | 20-50/70 cm | Very dark brown (10YR2/2 moist), with few brown (7.5YR5/4 moist) mottles; medium to heavy clay; angular blocky, parting to coarse lenticular structure; obvious and frequent slickensides; strong consistence dry; pH 7.8; abrupt and wavy change to: | |
B23k/R | 50/70+ cm | Brown (7.5YR4/3 moist); >50% soft carbonate in clay matrix; fragments of hard basalt grading into continuous fractured basalt; pH 8.6. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Neutral | Low | Non-Sodic | None1 |
Deeper Subsoil (at 80-90 cm) | Strongly Alkaline | Low | Slightly Sodic | None |
1 Slight-moderate dispersion after remoulding. |
The surface is slightly acid. The subsoil is neutral becoming strongly alkaline at depth. | Salinity rating is low throughout the profile. | The soil is non sodic in the surface and upper subsoil becoming slightly sodic at depth. | Clay levels are quite high throughout the profile. |
Horizon | Sample Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-5 | 6.8 | 6.2 | 0.18 | 21 | 13 | 1.5 | 0.73 | |
B21t | 10-20 | 7 | 6.2 | 0.15 | 22 | 17 | 1.3 | 1.3 | |
B22t(ss) | 30-45 | 7.8 | 7.8 | 0.14 | 23 | 17 | 0.77 | 1.9 | |
B23k | 80-90 | 8.6 | 7.9 | 0.34 | 0.01 | 26 | 21 | 0.5 | 3.1 |
Horizon | Sample Depth (cm) | 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 | 3.4 | 0.31 | 47.2 | 28.8 | 7 | 15 | 19 | 49 |
B21t | 10-20 | 60.9 | 35.8 | 4 | 11 | 12 | 64 | ||
B22t(ss) | 30-45 | 61.7 | 34.9 | 4 | 13 | 18 | 56 | ||
B23k | 80-90 | 69.2 | 41.6 |