Location: Tarraville. | Australian Soil Classification: Vertic, Subnatric |
Black SODOSOL. | Geology: Late Pleistocene alluvial deposits. |
General Landscape Description: Level plain. | Soil Mapping Unit: Yarram, clay surface. |
Site Description: Irrigated grazing paddock. |
GP44 Landscape |
A11 | 0-5 cm | Black (10YR2/1); hard surface condition; light fine sandy clay loam; strong medium polyhedral, parting to fine polyhedral structure; very firm consistence dry; pH 6.0; clear change to: | Site GP44 profile |
A12 | 5-20 cm | Black (10YR2/1); light fine sandy clay loam; strong medium prismatic, parting to strong fine prismatic structure; very firm consistence dry; pH 5.8; slightly wavy change to: | |
Subsoil | |||
B21 | 20-40 cm | Black (10YR2/1) with faint brownish yellow (10YR6/6) mottles; medium clay; moderate coarse prismatic, parting to moderate coarse angular blocky structure; very strong consistence dry; pH 6.2; clear change to: | |
B22 | 40-80 cm | Dark grey (10YR4/1) with yellowish red (10YR5/6) mottles; heavy clay; moderate coarse prismatic, parting to moderate coarse angular blocky structure; very strong consistence dry; pH 7.0; gradual change to: | |
B23 | 80-140 cm | Grey (10YR5/1) with light yellowish brown (2.5Y6/4) mottles; heavy clay; slickensides are evident with lenticular structure; pH 7.6. |
pH | Salinity Rating | |||
Surface (A11 horizon) | Moderately Acid | Low | Non- Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Low | Sodic | Moderate1 |
Deeper subsoil (at 1 m) | Slightly Alkaline | Moderate - High | Strongly Sodic | None |
The surface soil is moderately acid. The upper subsoil is slightly acid becoming slightly alkaline by 1 m depth. | The salinity rating in the surface soil and upper subsoil is low but becomes moderate to high below 40 cm depth. | The surface soil is non-sodic. The subsoil is sodic and becomes strongly sodic at about half a metre. | The clay content increases markedly at the A/B boundary by 20% (20 cm depth). |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A11 | 0-5 | 6 | 5.3 | 0.16 | 7 | 4.9 | 0.97 | 0.98 | |
A12 | 5-20 | 5.8 | 5 | 0.12 | 5.5 | 4.5 | 0.33 | 0.89 | |
B21 | 20-40 | 6.2 | 5.4 | 0.26 | 0.04 | 3.8 | 8.7 | 0.73 | 3.2 |
B22 | 40-80 | 7 | 6.5 | 1 | 0.22 | 2.7 | 11 | 0.6 | 5.8 |
B23 | 80-140 | 7.6 | 7 | 1.1 | 0.27 | 2.1 | 7.6 | 0.4 | 6.1 |
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 | 0-5 | 10 | 16.4 | 3 | 55 | 10 | 21 | ||
A12 | 5-20 | 11 | 13.6 | 3 | 59 | 10 | 20 | ||
B21 | 20-40 | 9.4 | 16.9 | 2 | 45 | 11 | 40 | ||
B22 | 40-80 | 5.4 | 23 | 1 | 30 | 8 | 59 | ||
B23 | 80-140 | 17 | 1 | 49 | 6 | 43 |