Location: Nambrok West. | Australian Soil Classification: Vertic, Mottled-Mesonatric, Brown SODOSOL. |
Great Soil Group: solodic. | Geology: Pleistocene and recent sediments. |
General Landscape Description: Level plain. | Mapping Unit: Winnindoo. |
Site Description: Pasture paddock. |
Site GP37 Landscape |
A1 | 0-10 cm | Dark brown (10YR3/3); loam, fine sandy; firm consistence dry; pH 5.7; clear change to: | Site GP37 Profile |
A2 | 10-20 cm | Brown (10YR4/3) sporadically bleached (10YR6/2d) with brownish yellow (10YR6/6) mottles; fine sandy loam; very strong consistence dry; pH 5.2; abrupt change to: | |
Subsoil | |||
B21 | 20-50 cm | Yellowish brown (10YR5/4) with brownish yellow (10YR6/6 and 6/8) mottles; medium clay; moderate coarse subangular blocky, parting to weak blocky structure; very strong consistence dry; contains dark organic matter stains on ped faces; pH 7.3; clear change to: | |
B22 | 50-90 cm | Yellowish brown (10YR5/4) with brownish yellow (10YR6/6) mottles; medium clay; pH 8.5; gradual change to: | |
B23 | 90+ cm | Brownish yellow (10YR6/6); strong coarse blocky, parting to strong medium blocky structure; shiny faced peds; contains some ironstone nodules (2-4 mm in size); slickensides are present; pH 8.8. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Alkaline | Low | Strongly Sodic | Complete |
Deeper subsoil (at1 m) | Strongly Alkaline | Moderate | - | Complete |
The surface is moderately acid. The subsoil is slightly alkaline becoming strongly alkaline at 80 cm. | The surface is non-sodic. The subsoil is strongly sodic. | ||
The surface has a low salinity level. The subsoil becomes moderate at 1 metre. | The clay content increases significantly 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 | |||||||||
A1 | 0-10 | 5.7 | 4.9 | 0.18 | 2.5 | 1.9 | 1.4 | 0.36 | |
A2 | 10-20 | 5.2 | 4.6 | 0.21 | 1.4 | 1.5 | 0.72 | 0.42 | |
B21 | 20-50 | 7.3 | 6.3 | 0.18 | 2.3 | 7.1 | 0.56 | 2.1 | |
B22 | 50-90 | 8.5 | 7.4 | 0.35 | 0.06 | 1.8 | 7.6 | 0.6 | 3.1 |
B23 | 90+ | 8.8 | 7.9 | 0.51 | 0.1 |
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) |
A1 | 0-10 | 7 | 16 | 46 | 19 | 14 | |||
A2 | 10-20 | <10 | 6.5 | 5 | 14 | 48 | 21 | 15 | |
B21 | 20-50 | 13 | 13 | 31 | 7 | 35 | |||
B22 | 50-90 | 15 | 9 | 30 | 18 | 42 | |||
B23 | 90+ |