Location: Alvie
Australian Soil Classification: Sodic, Eutrophic, Brown DERMOSOL
General Landscape Description: Lower slope of a gently undulating rise.
Geology: Quaternary volcanic ash deposits (Qvs).
Land Use: Pasture has been cultivated and improved. Alternate with silage crop. Irrigated in Summer.
SW8 Landscape
Soil Profile Morphology:
Surface Soil
A1 | 0-15 cm | Brown (7.5YR4/2); firm surface condition; fine sandy clay loam; moderate medium blocky, parting to moderate fine blocky structure; firm consistence moderately moist; pH 6.6; clear change to: | SW8 Profile |
Subsoil | |||
B21 | 15-25 cm | Dark reddish brown (5YR3/3); heavy clay loam (becoming light clay with depth); moderate medium blocky, parting to moderate fine polyhedral structure; firm consistence moderately moist; pH 6.5; abrupt change to: | |
B22 | 25-40 cm | Dark brown (7.5YR3/4); light medium clay; strong medium polyhedral, parting to strong fine polyhedral structure, smooth faced peds; very firm consistence dry; pH 6.5; gradual change to: | |
B23 | 40-50 cm | Dark brown (7.5YR3/2); medium clay; strong coarse blocky, parting to strong fine polyhedral structure; firm consistence slightly moist; roots to 50cm; pH 7.1; gradual change to: | |
B/C | 50-70 cm | Dark brown (7.5YR3/2); fine sandy clay loam; very firm to strong consistence dry; contains a common (20%) amount of weathered basalt and volcanic ash; pH 8.0: | |
C | 70+ cm | Volcanic ash deposits. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Acid | Low | Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Marginally Sodic | None |
Deeper Subsoil (at 50-70 cm) | Moderately Alkaline | Moderate | Non-Sodic | None |
The surface (A) horizons and upper subsoil are slightly acid. The deeper subsoil is slightly alkaline becoming moderately alkaline at depth. |
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Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-15 | 6.6 | 5.6 | 0.14 | 7.3 | 7.7 | 0.71 | 1.3 |
B21 | 15-25 | 6.5 | 5.5 | 0.11 | 6.4 | 10 | 0.68 | 0.95 |
B22 | 25-40 | 6.5 | 5.5 | 0.09 | 7.4 | 19 | 0.85 | 1.1 |
B23 | 40-50 | 7.1 | 5.9 | 0.08 | 8.2 | 28 | 0.89 | 1.1 |
B/C | 50-70 | 8.0 | 7.2 | 0.22 | 11 | 26 | 0.83 | 1.7 |
Horizon | Horizon Depth (cm) | Organic Carbon % | 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 | 0-15 | 2.4 | 16.1 | 7.0 | 34.8 | 21.0 | 30.0 |
B21 | 15-25 | 1.4 | 17.9 | 7.0 | 31.5 | 14.5 | 41.0 |
B22 | 25-40 | 24.6 | 6.7 | 21.8 | 11.0 | 53.5 | |
B23 | 40-50 | 30.5 | 6.3 | 18.4 | 10.5 | 57.0 | |
B/C | 50-70 | 23.7 | 23.4 | 36.0 | 14.0 | 17.5 |