Australian Soil Classification: Vertic (& Calcic), Subnatric, Black SODOSOL | General Landscape Description: Gently undulating basalt plain |
Soil Profile Morphology:
A1 | 0-10 cm | Very dark brown (10YR2/2 moist), dark greyish brown (10YR4/2 dry); loam; pH 5.5; clear change to: | SW83 Profile - Note: Surface (A1) horizon has been stripped from the profile |
A2 | 10-60 cm | Dark greyish brown (10YR4/2 moist), conspicuously bleached; (10YR7/2 dry); sandy clay loam; apedal; massive; few (2%), fine buckshot nodules (concentrated in pockets); pH 6.6; abrupt and wavy change to: | |
Subsoil | |||
B21 | 60-90 cm | Black (10YR2/1 moist); heavy clay; few pockets of ferruginous fine gravel; coarse prismatic structure; pH 6.8; abrupt change to: | |
B22 | 90 cm+ | Mottled dark geyish brown grey with (10YR6/1 moist) and minor (<2%), brownish yellow (10YR6/8 moist) and light olive brown (2.5Y5/4 moist) mottles, soft calcareous segregations; strongly vertic; medium clay; medium prismatic structure; pH 8.6. |
pH | Salinity Rating | Sodicity | Dispersion | |
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slight Acid | Low | Sodic | None1 |
Deeper subsoil (at 90+ cm) | Strongly Alkaline | Low | Strongly Sodic | Strong - Complete |
1 complete dispersion after remoulding |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-10 | 5.5 | 4.9 | 0.21 | 6.2 | 3.2 | 0.61 | 0.37 | |
A2 | 10-60 | 6.6 | 6 | 0.06 | 1.7 | 1.4 | <0.05 | 0.18 | |
B21 | 60-90 | 6.8 | 5.6 | 0.11 | 5.9 | 11 | 0.3 | 2.4 | |
B22 | 90+ | 8.6 | 7.5 | 0.25 | 7 | 12 | 0.28 | 4 |
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 | 0-10 | <10 | 12 | 25.6 | 10.8 | 22.9 | 37 | 13.5 | 20.5 |
A2 | 10-60 | 3.3 | 16.6 | 3.8 | 28.6 | 46.2 | 14 | 11.5 | |
B21 | 60-90 | 11 | 39.4 | 22.4 | 14.4 | 21.4 | 7 | 54.5 | |
B22 | 90+ | 39.3 | 19.9 | 15.3 | 28.4 | 7.5 | 46.5 |