Location: Yarram. | Australian Soil Classification: Sodic, Eutrophic, Grey DERMOSOL. |
Geology: Late Pleistocene alluvial deposits. | |
General Landscape Description: Lower slope on gently undulating plain (1-2% slope) of old prior stream landscape (stagnant alluvial plain). This site is located on the near floodplain position of a prior stream. | |
Soil Mapping Unit: Yarram. | Site Description: Grazing paddock. |
Site GP41 Landscape |
A11 | 0-25 cm | Dark greyish brown (10YR4/2); silty clay loam; moderate polyhedral structure; very firm consistence dry; pH 5.5; clear change to: | Site GP41 Profile |
A12 | 25-50 cm | Dark greyish brown (10YR4/2) with faint yellowish brown (10YR5/8) mottles and some bleached material; heavy silty clay loam; strong coarse blocky structure; strong consistence dry; pH 5.8; clear change to: | |
Subsoil | |||
B21 | 50-75 cm | Dark greyish brown (10YR4/2) with yellowish brown (10YR5/8) mottles as well as bleached material down some root channels; medium clay; moderate coarse prismatic, parting to strong medium polyhedral structure; strong consistence dry; pH 5.9; gradual and wavy change to: | |
B22 | 75-100 cm | Grey (10YR6/1) with brownish yellow (10YR6/8) mottles; heavy clay; contains few (5%) manganese and iron nodules; pH 6.1; gradual change to: | |
B23 | 100-150 cm | Heavy clay; coarse prismatic structure; contains few (2-10%) manganese stains; pH 5.9. |
pH | Salinity Rating | |||
Surface (A11 horizon) | Strongly Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Moderately Acid | Very low | Sodic | Moderate2 |
Deeper subsoil (at 1 m) | Moderately Acid | Low | Sodic | Moderate2 |
The surface soil is strongly acid. The subsoil is moderately acid throughout. | The salinity rating is low throughout the profile. | There is only a moderate increase in clay percentage at the A/B horizon interface. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A11 | 0-25 | 5.5 | 4.8 | 0.17 | 5.3 | 4.4 | 0.6 | 0.72 | |
A12 | 25-50 | 5.8 | 4.7 | 0.07 | 3.4 | 4.3 | 0.23 | 0.7 | |
B21 | 50-75 | 5.9 | 4.8 | 0.11 | 3.5 | 6.2 | 0.27 | 1.5 | |
B22 | 75-100 | 6.1 | 6.1 | 0.22 | 3.4 | 6.3 | 0.29 | 2.1 | |
B23 | 100-150 | 5.9 | 5.2 | 0.47 | 0.12 |
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 | 0-25 | <10 | 15 | 19.1 | 2 | 20 | 40 | 29 | |
A12 | 25-50 | 9.7 | 15.7 | 2 | 21 | 41 | 34 | ||
B21 | 50-75 | 11 | 18.6 | 1 | 18 | 34 | 46 | ||
B22 | 75-100 | 7 | 17.9 | 3 | 19 | 32 | 45 | ||
B23 | 100-150 |