Location: Near Lake Wellington. | Australian Soil Classification: Mottled-Sodic, Hypocalcic, Brown DERMOSOL. |
Geology: Quaternary and Holocene swamp deposits. | General Landscape Description: Low lying level plain. |
Mapping Unit: Wandocka. | Site Description: Grazing paddock. |
Site GP71 Landscape |
A1 | 0-15 cm | Black (10YR2/1); clay loam; weak coarse blocky, parting to moderate medium polyhedral, parting to fine polyhedral structure; strong consistence dry; pH 5.8; gradual change to: | Site GP71 Profile |
Subsoil | |||
B21 | 15-30 cm | Black (10YR2/1); light medium clay; moderate coarse prismatic structure; strong consistence dry; pH 6.4; gradual and wavy change to: | |
B22 | 30-60 cm | Yellowish brown (10YR5/6) mixed with very dark greyish brown (10YR3/2); medium clay; strong coarse prismatic, parting to moderate coarse blocky structure; strong consistence dry; pH 8.2; gradual and wavy change to: | |
B23 | 60-90 cm | Light brown (7.5YR6/4) with brownish yellow (10YR6/8) mottles; medium clay; strong coarse prismatic, parting to moderate coarse blocky structure; strong consistence dry; pH 8.6; gradual and wavy change to: | |
B24 | 90+ cm | Grey (10YR6/1) with brownish yellow (10YR6/6) and light brown (7.5YR6/4) mottles; light medium clay; contains very few (1-2%) soft carbonate in patches; slightly micaceous; pH 8.9. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Low-Moderate | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Sodic | None2 |
Deeper Subsoil (at 90 cm) | Strongly Alkaline | High | Extremely Sodic | Slight1 |
The soil profile becomes increasingly alkaline with depth. | The surface is non-sodic. The subsoil is sodic becoming strongly sodic at 40 cm depth. | ||
The surface salinity is low to moderate. The upper subsoil is very low becoming high at depth. | The clay content changes only gradually with depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-10 | 5.8 | 5 | 0.22 | 7 | 4.5 | 0.65 | 1.3 | |
B21 | 10-30 | 6.4 | 5.2 | 0.1 | 5.9 | 5.8 | 0.34 | 1.2 | |
B22 | 30-60 | 8.2 | 7.2 | 0.22 | 5.1 | 8.8 | 0.31 | 2.8 | |
B23 | 60-90 | 8.6 | 7.7 | 0.47 | 3.8 | 6.6 | 0.23 | 4 | |
B24 | 90+ | 8.9 | 8.3 | 1 | 3.5 | 5.7 | <0.1 | 8.1 |
Horizon | Horizon Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | 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 | 16 | 13 | 16 | 5 | 35 | 22 | 28 | |
B21 | 10-30 | 13.9 | 3 | 30 | 21 | 42 | |||
B22 | 30-60 | 16.2 | 3 | 38 | 22 | 33 | |||
B23 | 60-90 | 16 | 39 | 21 | 36 | ||||
B34 | 90+ | 18.5 |