Location: Devon. | Australian Soil Classification: Humose-Acidic, Dermosolic, Oxyaquic HYDROSOL |
Geology: Recent alluvial deposits. | General Landscape Description: Tarra River flats. |
Soil Mapping Unit: Riverine | Site Description: Grazing paddock. |
Site GP40 Landscape |
A11 | 0-20 cm | Very dark greyish brown (10YR3/2); light silty clay loam; strong fine polyhedral structure; pH 5.0; clear change to: | Site GP50 Profile |
A12 | 20-50 cm | Black (10YR2/1) with faint rusty root channel mottling; light fine sandy clay loam (organic and peaty); moderate polyhedral, parting to strong fine polyhedral structure; pH 4.7; smooth change to: | |
A2 | 50-90 cm | Very dark grey (10YR3/1) with minor rusty root channel mottling; heavy fine sandy clay loam; pH 5.0; contains organic reed material; water comes into this layer; smooth change to: | |
Subsoil | |||
B21 | 90-110 cm | Very dark grey (2.5Y3/1) with minor rusty root channel mottling; fine sandy light clay; weak medium polyhedral structure; minor organic reed content; pH 4.9. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Moderate - High | Non-Sodic | None1 |
Subsoil (B21 horizon) | Strongly Acid | Low - Moderate | Non-Sodic | None |
Deeper subsoil (at 1 m) | Very Strongly Acid | Low | Non-Sodic | None |
The surface soil is strongly acid becoming very strongly acid at 20 cm. | The salinity rating in the surface soil is moderate to high and decreases with depth to relatively low levels. | The levels of exchangeable aluminium are high throughout the sub-soil. | The clay content is fairly constant throughout the profile. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A11 | 0-20 | 5 | 4.6 | 0.63 | 0.07 | 2.8 | 3.1 | 0.4 | 1 |
A12 | 20-50 | 4.7 | 4.3 | 0.4 | 0.05 | 1.2 | 1.6 | 0.3 | 0.7 |
A2 | 50-90 | 5 | 4.9 | 0.24 | 5.8 | 5.3 | 0.34 | 0.81 | |
B21 | 90-110 | 4.9 | 4.3 | 0.1 | 4.6 | 4.1 | 0.31 | 0.48 |
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) |
A11 | 0-20 | 52 | 25 | 26.8 | 10 | 10 | 31 | 31 | |
A12 | 20-50 | 290 | 29 | 32.5 | 2 | 5 | 25 | 48 | |
A2 | 50-90 | 300 | 31 | 30.6 | 10 | 9 | 30 | 32 | |
B21 | 90-110 | 190 | 19.9 | 1 | 10 | 41 | 39 |