Location: Warncoort
Australian Soil Classification: Vertic (& Sodic), Calcic, Black CHROMOSOL
General Landscape Description: Gently undulating plain.
Site Description: Puff 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: | SW82 Profile. Note: Surface (A1) horizon has been stripped from the soil profile |
Subsoil | |||
B21 | 10-40 cm | Very dark grayish brown (10YR3/2 moist); medium heavy clay; medium to fine (5-20 mm) polyhedral structure; strong consistence dry; pH 5.8; gradual change to: | |
B22 | 40-90 cm | Dark grayish brown (10YR4/2 moist) and brownish yellow (10YR6/6) mottles; heavy clay; some pockets of fine buckshot; coarse prismatic, parting to fine lenticular structure; strong consistence dry; pH 6.8; abrupt change to: | |
B23ssgk | 90 cm+ | Dark grayish brown (10YR4/2 moist) with brownish yellow (10YR6/6 moist) and very few (<2%) light olive brown (2.5Y5/4 moist) mottles ; medium (20-50 mm) prismatic structure; strong consistence dry; very few (<2%) soft carbonate segregations; strongly vertic; pH 8.5. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Very Low | Non-Sodic | None1 |
Deeper Subsoil (at 90+ cm) | Moderately Alkaline | Low | Strongly Sodic | Strong - Complete |
1 Slight dispersion after remoulding. |
The surface soil is strongly acid. The subsoil is moderately acid becoming moderately 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 | 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 | |
B21 | 10-40 | 5.8 | 4.8 | 0.1 | <0.01 | 7.2 | 7.9 | 0.4 | 0.5 |
B22 | 40-90 | 6.8 | 5.6 | 0.09 | 7.9 | 13 | 0.41 | 1.8 | |
B23 | 90+ | 8.5 | 7.3 | 0.17 | 6.5 | 12 | 0.27 | 3.2 |
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 | 12 | 3.8 | 0.29 | 25.6 | 10.8 | 23 | 37 | 14 | 21 |
B21 | 10-40 | 18 | 15 | 39.6 | 24.6 | 13 | 21 | 7 | 56 | ||
B22 | 40-90 | 12 | 45.5 | 26.7 | 11 | 16 | 6 | 63 | |||
B23 | 90+ | 18 | 25 | 7 | 48 |