Australian Soil Classification: Vertic (& Calcic), Mottled-Mesonatric, Black SODOSOL | General Landscape Description: Gently undulating basalt plain |
Site Description: Depression, flat | Geology: Quaternary-Newer Volcanics |
Soil Profile Morphology:
Ap | 0-8 cm | Very dark brown (10YR2/2 moist), greyish brown (10YR5/2 dry); sandy clay loam; rusty root channel mottling prominent; hard-setting; strong consistence; pH 6.2; clear change to: | SW86 Profile |
A2 | 8-17 cm | Very dark greyish brown (10YR3/2 moist and 10YR5/1 dry); loam; rusty mottling prominent (~5% fine magnetic buckshot); strong consistence; pH 6.9; abrupt change to: | |
Subsoil | |||
B21tg | 17-40 cm | Very dark greyish brown (10YR3/2 moist), dark greyish brown (10YR4/2 dry) with olive grey (5Y5/2 moist) mottles in ped interiors, and prominent yellowish brown (10YR5/8 moist) mottles associated with root channels; light medium clay to medium clay; many (~25%); roughly coarse prismatic (~100 mm), parting to coarse (mostly rough-face) blocky and angular coarse blocky; very strong consistence, pH 8.1; clear change to: | |
B22ss | 40-60 cm | Very dark greyish brown (2.5Y3/2 moist); fine lenticular and polyhedral structure; moderate slickensides; pH 8.6; clear change to: | |
B23 | 80-200 cm | Olive to light olive grey (5Y6/2-5/3 moist); fine brownish yellow (10YR6/8 moist) mottles; soft, yellowish white carbonate; calcareous continues to 2 metres; pH 9.2. |
pH | Salinity Rating | Sodicity | Dispersion | |
Surface (A1 horizon) | Slightly Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Moderately Alkaline | Medium - High | Strongly Sodic | Strong |
Deeper subsoil (at 80 cm) | Very Strongly Alkaline | High - Very High | Strongly Sodic | - |
1 Moderate dispersion after remoulding |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-8 | 6.2 | 5.7 | 0.24 | 7.3 | 8.9 | 0.72 | 1.4 | |
A2 | 8-17 | 6.9 | 6.2 | 0.15 | 4 | 5.2 | 0.2 | 1 | |
B21 | 17-40 | 8.1 | 7.3 | 0.6 | 0.11 | 4.4 | 12 | 0.7 | 3.8 |
B22 | 40-60 | 8.6 | 8.1 | 1.6 | 0.4 | 5.1 | 18 | 0.8 | 7.5 |
B23 | 60-80 | 8.8 | 8.5 | 2 | 0.46 | 5 | 19 | 0.7 | 8.1 |
B24kg | 80-200 | 9.2 | 8.6 | 1.3 | 0.25 |
Horizon | Horizon Depth (cm) | Ex Al mg/kg | Ex Ac meq/100g | Field 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 | 0-8 | <10 | 12 | 35 | 17.9 | 20.2 | 30.5 | 14 | 28 |
A2 | 8-17 | 22.2 | 8.9 | 26.1 | 39.6 | 15 | 18 | ||
B21 | 17-40 | 38.7 | 18.2 | 15.1 | 31.8 | 12.5 | 37 | ||
B22 | 40-60 | 46.6 | 24.9 | 11.6 | 24.4 | 13 | 47.5 | ||
B23 | 60-80 | ||||||||
B24kg | 80-200 |