SM03
Location: Cavendish
Australian Soil Classification: Vertic, Mottled-Subnatric, Brown SODOSOL
General Landscape Description: Gently Undulating Rises.
Site Description: Upper slope.
Land Use: Grazing.
Geology: Basalt.
SM03 Landscape - soil site is in the foreground.
Soil Profile Morphology:
| Surface Soil |  SM03 profile | ||
| A1 | 0-12 cm | Dark brown (7.5YR3/2); firm surface condition; heavy loam; moderate medium polyhedral, parting to fine polyhedral structure; rough fabric; weak consistence moderately moist; many medium to fine roots present; pH 5.1; abrupt change to: | |
| A2 | 12-25/40 cm | Dark greyish brown (10YR4/2), sporadic bleach; sandy clay loam; weak medium polyhedral, parting to fine polyhedral structure; rough fabric; weak consistence moderately moist; medium to fine roots common; pH 5.1; abrupt and wavy change to: | |
| Subsoil | |||
| B21 | 25/40-60 cm | Strong brown (7.5YR5/8) with many prominant dark grey (7.5YR4/1) and black (7.5YR2.5/1) mottles; medium heavy clay; moderate medium polyhedral, parting to fine polyhedral structure; smooth fabric; very firm consistence moderately moist; very plastic; prominent organo-clay cutans common; few fine roots present; pH 6.5; gradual change to: | |
| B22 | 60-105 cm | Light olive brown (2.5Y5/3) with many prominent dark brownish yellow (10YR6/6) and dark grey (10YR4/1) mottles; heavy clay; moderate medium polyhedral, parting to fine polyhedral structure; smooth fabric; very firm consistence moist; very plastic; prominent organo-clay cutans common; fine ferro-manganiferous concretions common; few fine and very fine roots present; pH 7.8; clear and wavy change to: | |
| B23 | 105-145 cm | Light brownish grey (10YR6/2) with many distinct strong brown (7.5YR4/6) mottles; medium clay (sandy); moderate coarse lenticular, parting to medium to fine prismatic structure; smooth fabric; very firm consistence moderately moist; very plastic; very few ferro-manganiferous concretions; few distinct slickensides and organo-clay cutans; few fine and very fine roots present; pH 8.3; diffuse change to: | |
| B24 | 145 - 160+ cm | Pale brown (10YR6/3), with many faint reddish yellow (7.5YR6/6) mottles; medium heavy clay (sandy); moderate coarse lenticular, parting to medium to fine prismatic structure; smooth fabric; very firm consistence moderately moist; very plastic; very few soft calcareous segregations; prominent slickensides common with organo-clay cutans; few very fine roots present; pH 8.2. |  |
Soil Profile Characteristics:
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Sodic | Slight |
Deeper Subsoil (at 105-145 cm) | Moderately Alkaline | Low | Strongly Sodic | Moderate1 |
| The surface soil is strongly acid. The upper subsoil is slightly acid becoming moderately alkaline with depth. | | The surface and upper subsoil have a very low salinity rating. The salinity rating in the deeper subsoil is low.
| | The surface soil is non-sodic. The upper subsoil is sodic becoming strongly sodic with depth. | | The MIR predicted clay levels are quite high in this profile. |
Chemical and Physical Analysis:
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Exchangeable Acidity meq/100g | Total Carbon g/100g | Exchangeable Aluminium mg/kg | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||||
meq/100g | |||||||||||
A1 | 0-12 | 5.0 | 4.1 | 0.07 | 10 | 2.1 | 76 | 2.6 | 1.0 | 0.06 | 0.29 |
A2 | 12-25/40 | 5.1 | 4.2 | <0.05 | | | | 1.7 | 0.7 | 0.05 | 0.20 |
B21 | 25/40-60 | 6.5 | 5.2 | 0.13 | 11 | | | 7.1 | 11 | 0.38 | 3.3 |
B22 | 60-105 | 7.8 | 6.5 | 0.32 | | | | 5.5 | 12 | 0.52 | 6.2 |
B23 | 105-145 | 8.3 | 7.0 | 0.31 | | | | 4.3 | 10 | 0.42 | 6.2 |
B24 | 145-160+ | 8.2 | 7.0 | 0.34 | | | | 4.8 | 11 | 0.34 | 7.8 |
Horizon | Horizon Depth (cm) | Field Capacity pF2.5 (MIR Predicted) | Wilting Point pF4.2 (MIR Predicted) | Coarse Sand (0.2-2.0mm) (MIR Predicted) | Fine Sand (0.02-0.2mm) (MIR Predicted) | Silt (0.002-0.02mm) (MIR Predicted) | Clay (<0.002mm) (MIR Predicted) |
A1 | 0-12 | 22.3 | 13.9 | 20 | 29 | 11 | 19 |
A2 | 12-25/40 | 17.3 | 10.2 | 22 | 32 | 12 | 16 |
B21 | 25/40-60 | 42.1 | 27.9 | 5 | 14 | 6 | 69 |
B22 | 60-105 | 35.5 | 22.8 | 12 | 19 | 4 | 52 |
B23 | 105-145 | 38.7 | 26.1 | 6 | 18 | 11 | 60 |
B24 | 145-160+ | 44.3 | 27.4 | 6 | 19 | 11 | 60 |
Profile Described By: David Rees and Ivanah Oliver (September 2014).
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