Location: Winchelsea
Australian Soil Classification: Epihypersodic-Endocalcareous, Self-Mulching, Black VERTOSOL
General Landscape Description: Gently undulating plains / rises.
Site Description: Gently inclined simple slope, easterly aspect.
Geology: Quaternary-Newer Volcanics - Basalt
SW87 Landscape
Soil Profile Morphology:
Surface Soil
A1 | 0-15 cm | Very dark grey (10YR3/1); thin cracking self-mulching surface condition; light medium clay; coarse blocky structure below surface; smooth faced peds; strong consistence dry; pH 5.7; gradual change to: NOTE: In the trench spoil the surface material had self-mulched to <5 mm sized peds. | SW87 Profile. Note: Surface (A1) horizon has been stripped from the profile. |
Subsoil | |||
B21ss | 15-50/70 cm | Black (2.5Y2.5/1); heavy clay; strong coarse irregular lenticular structure; prominent slickensides increasing in size with depth; strong consistence dry; pH 8.0; clear and wavy change to: | |
B22k | 50/70+ cm | Olive brown (2.5Y4/3t) and fine dark yellowish brown (10YR4/6 moist) mottles; medium clay to light medium clay; vertic properties; white soft calcium carbonate present; pH 8.7. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Moderately Acid | Low | None | None |
Subsoil (B21 horizon) | Moderately Alkaline | Medium - High | Strongly Sodic | Strong |
Deeper Subsoil (at 60+ cm) | Strongly Alkaline | Very High | Strongly Sodic | None1 |
1 No dispersion possibly due to high levels of soluble salts. |
The surface soil is moderately acid. The subsoil is moderately alkaline becoming strongly alkaline with depth. | Salinity rating is low in the surface becoming medium in the subsoil and very high with depth. |
| High clay content throughout the profile. |
Horizon | Sample Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-10 | 5.7 | 5 | 0.24 | 16 | 12 | 1.4 | 1 | |
Bss | 35-55 | 8 | 7.3 | 0.76 | 0.15 | 15 | 15 | 0.8 | 5.5 |
Bk | 60+ | 8.7 | 8.3 | 1.6 | 0.35 | 12 | 16 | 0.4 | 7.2 |
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 | 0-10 | <10 | 16 | 5.0 | 0.41 | 48.5 | 28.2 | 10 | 20 | 14 | 44 |
Bss | 35-55 | 54 | 25.6 | 5 | 19 | 15 | 56 | ||||
Bk | 60+ | 44.3 | 23.1 | 2 | 12 | 9 | 41 |