Location: Yarram. | Australian Soil Classification: Eutrophic, Mottled-Subnatric, Brown SODOSOL. |
Geology: Late Pleistocene alluvial deposits. | General Landscape Description: Levee of a prior stream from the late Pleistocene period. |
Soil Mapping Unit: Yarram. | Site Description: Grazing paddock. |
Site GP42 Landscape |
A1 | 0-20 cm | Very dark greyish brown (10YR3/2); light silty clay loam; moderate fine polyhedral structure; weak consistence dry; pH 5.5; clear change to: | Site GP42 Profile |
A2 | 20-45 cm | Greyish brown (10YR5/2) conspicuously bleached (10YR7/2d); silty loam; weak coarse blocky structure; firm consistence dry; contains few (2-10%) ferruginous nodules; pH 5.9; sharp change to: | |
Subsoil | |||
B21 | 45-60 cm | Very dark grey (10YR3/1) with faint yellowish brown (10YR5/6) mottles; medium clay; moderate coarse prismatic, parting to strong coarse blocky structure; strong consistence dry; contains manganese stains; pH 6.3; gradual change to: | |
B22 | 60-100 cm | Brown (10YR5/3) with fine brown (7.5YR4/3) mottles (and some dark organic stains); light medium clay; moderate coarse prismatic, parting to strong coarse blocky structure; strong consistence dry; contains few (5%) manganese nodules and significant (10%) manganese staining; pH 6.8; gradual change to: | |
B23 | 100+ cm | Brown (10YR5/3) with black (10YR2/1) stains in veins; light clay (fine sandy); moderate coarse prismatic structure; strong consistence dry; pH 6.9. |
pH | Salinity Rating | |||
Surface (A11 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Sodic | Moderate |
Deeper subsoil (at 1 m) | Slightly Acid | Very Low | Sodic | Strong |
The surface soil is strongly acid. The subsoil is slightly acid throughout. | The salinity rating is very low throughout the profile. | The clay content increases markedly at the A / B horizon boundary (at 45 cm). |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-20 | 5.5 | 4.6 | 0.08 | 4.9 | 2.9 | 0.34 | 0.57 | |
A2 | 20-45 | 5.9 | 4.6 | <0.05 | 1.8 | 2.9 | 0.17 | 0.36 | |
B21 | 45-60 | 6.3 | 5.1 | 0.08 | 2.8 | 10 | 0.35 | 1.8 | |
B22 | 60-100 | 6.8 | 5.7 | 0.1 | 2.6 | 8.9 | 0.27 | 2 | |
B23 | 100+ | 6.9 | 6.1 | 0.17 | 3 | 8.2 | 0.19 | 3.6 |
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 | 0-20 | 15 | 16 | 17.4 | 3 | 35 | 34 | 21 | |
A2 | 20-45 | 8.6 | 9.2 | 2 | 41 | 36 | 21 | ||
B21 | 45-60 | 14 | 18 | 4 | 26 | 22 | 46 | ||
B22 | 60-100 | 7.2 | 17.7 | 1 | 30 | 26 | 44 | ||
B23 | 100+ | <10 |