Location: Warncoort
Australian Soil Classification: Vertic (& Calcic), Subnatric, Black SODOSOL
General Landscape Description: Gently undulating plain.
Site Description: Trough of a gilgai.
Geology: Basalt plain.
Soil Profile Morphology:
Surface Soil
A1 | 0-10 cm | Very dark brown (10YR2/2 moist); loam; pH 5.5; clear change to: | SW83 Profile. Note: Surface (A1) horizon has been stripped from the profile |
A2 | 10-60 cm | Dark grayish brown (10YR4/2 moist) conspicuously bleached (10YR7/2 dry); sandy clay loam; apedal; massive; few (2%), fine buckshot nodules (concentrated in pockets); firm consistence dry; 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 | Gray (10YR6/1 moist) with very few (<2%) brownish yellow (10YR6/8 moist) and dark red (2.5YR4/8 moist) mottles; medium clay; medium prismatic structure; strongly vertic; soft calcareous segregations; pH 8.6. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slight Acid | Very Low | Sodic | None1 |
Deeper Subsoil (at 90+ cm) | Strongly Alkaline | Low | Strongly Sodic | Strong - Complete |
1 Complete dispersion after remoulding. |
The surface soil is strongly acid. The subsoil is slightly acid becoming strongly alkaline with depth. | Salinity rating is low in the surface becoming very low in the subsoil. |
| The clay content increases markedly at the A/B boundary. |
Horizon | Sample Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | 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 | 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 | 12 | 3.8 | 0.29 | 25.6 | 10.8 | 23 | 37 | 14 | 21 |
A2 | 10-60 | 3.3 | 16.6 | 3.8 | 29 | 46 | 14 | 12 | |||
B21 | 60-90 | 11 | 39.4 | 22.4 | 14 | 21 | 7 | 55 | |||
B22 | 90+ | 39.3 | 19.9 | 15 | 28 | 8 | 47 |