Location: Nambrok. | Australian Soil Classification: Vertic (& Mottled-Sodic), Eutrophic, Brown CHROMOSOL. |
Great Soil Group: solodic. | Geology: Mid Pleistocene alluvial plain deposits. |
General Landscape Description: Upper slope of an old alluvial plain from the mid-Pleistocene era. | Mapping Unit: Wooundellah. |
Site Description: Grazing paddock. |
Site GP67 Landscape |
A11 | 0-15 cm | Brown (10YR4/3); fine sandy clay loam; weak coarse blocky structure; very firm consistence dry; pH 5.6: | Site GP67 Profile |
A12 | 15-30 cm | Brown (10YR4/3); sporadically bleached; with rusty root channel mottling; fine sandy clay loam; weak coarse blocky structure; very firm consistence dry; pH 5.9: | |
A2 | 30-40 cm | Dark yellowish brown (10YR4/4) sporadically bleached; fine sandy clay loam; moderate coarse polyhedral, parting to moderate fine polyhedral structure; very firm consistence dry; pH 5.9: | |
Subsoil | |||
B21 | 40-60 cm | Dark yellowish brown (10YR4/4) with dark red (2.5YR4/8) and brownish yellow (10YR6/8) mottles; medium clay; strong coarse polyhedral, parting to strong fine polyhedral structure; shiny faced peds; strong consistence dry; pH 6.1: | |
B22 | 60-100 cm | Yellowish brown (10YR5/8) with dark yellowish brown (10YR4/4) and slight dark red (2.5YR4/8) mottles; medium clay; moderate coarse prismatic, parting to moderate coarse blocky structure; shiny faced peds; strong consistence dry; many slickensides evident; pH 7.3: | |
B23 | 100-120 cm | Yellowish brown (10YR5/6); medium clay (sandy); moderate coarse prismatic, parting to moderate coarse blocky structure; dark staining evident; contains few (10%) quartz grit; pH 6.9: | |
B24 | 120+ cm | Reddish brown (5YR5/4); sandy clay; massive structure; pH 7.7. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Moderate | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None2 |
Deeper subsoil (at 1 m) | Slightly Alkaline | Very Low | Sodic | Slight2 |
The surface soil is moderately acid. The upper subsoil is slightly acid becoming slightly alkaline at 1 m depth. | The surface and upper subsoil is non-sodic becoming sodic at 60 cm depth. | ||
The surface salinity rating is moderate. The subsoil is very low. | The clay content increases markedly 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 | 0-15 | 5.6 | 5 | 0.45 | <0.03 | 4.9 | 1.5 | 1.4 | 0.1 |
A12 | 15-30 | 5.9 | 5 | 0.12 | 2.6 | 1 | 0.8 | 0.25 | |
A2 | 30-40 | 5.9 | 4.9 | 0.07 | 2 | 1.4 | 0.83 | 0.14 | |
B21 | 40-60 | 6.1 | 5.1 | 0.07 | 3.5 | 5.6 | 1.3 | 0.4 | |
B22 | 60-100 | 7.3 | 6.2 | 0.07 | 2.8 | 7.1 | 0.18 | 1.4 | |
B23 | 100-120 | 6.9 | 5.9 | 0.07 | 3.8 | 9.7 | 0.41 | 1.5 | |
B24 | 120+ | 7.7 | 6.5 | 0.07 | 2.5 | 6.4 | 0.15 | 1.3 |
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 | 0-15 | 16 | 8.7 | 16 | 39 | 20 | 22 | ||
A12 | 15-30 | <10 | 7.7 | 14 | 41 | 231 | 24 | ||
A2 | 30-40 | <10 | 4.8 | 8.7 | 16 | 38 | 19 | 29 | |
B21 | 40-60 | <10 | 9.4 | 20.8 | 8 | 19 | 12 | 62 | |
B22 | 60-100 | 15.8 | 29 | 13 | 10 | 50 | |||
B23 | 100-120 | ||||||||
B24 | 120+ |