Location: Lara
Australian Soil Classification: Endocalcareous, Epipedal, Black VERTOSOL
General Landscape Description: Near level plain.
Site Description: Broad flat ridge slope <1%, easterly aspect.
Geology: Recent alluvium overlying Quaternary basalt.
Soil Profile Morphology:
Surface Soil
Ap | 0-20 cm | Dark brown (7.5YR3/2 moist and 7.5YR4/2 dry); light clay; many fine calcareous nodules; pH 8.5; abrupt change to: | SW104 Profile - Note: Surface stripped from soil profile. |
Subsoil | |||
B21tss | 20-40 cm | Very dark greyish brown (10YR3/2); medium heavy clay; fine prismatic parting to blocky structure; slickensides; pH 8.6; wavy change to: | |
B22tss | 40-50 cm | Brown (7.5YR4/3); angular blocky to lenticular structure: | |
B23k/C | 50+ cm | Soft whitish calcium carbonate [CaCO3] over fractured basalt; highly calcareous in fissures. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Moderately Alkaline | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Strongly Alkaline | Low | Sodic | None1 |
1 Strong dispersion after remoulding. |
The surface is moderately alkaline. The subsoil is strongly alkaline. | Salinity rating is low throughout the profile.. | The soil is non sodic in the surface and sodic in the subsoil. | The clay content is high throughout the profile. |
Horizon | Sample Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
Ap | 0-20 | 8.5 | 7.9 | 0.2 | 27 | 5.5 | 1.1 | 1 | |
B21 | 20-40 | 8.6 | 7.8 | 0.28 | <0.01 | 20 | 11 | 1.1 | 2.9 |
Horizon | Sample Depth (cm) | Organic Carbon % | Nitrogen % | 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) |
Ap | 0-20 | 1.6 | 0.15 | 37.1 | 18.8 | 6 | 28 | 21 | 39 |
B21 | 20-40 | 56.1 | 31.2 | 4 | 12 | 13 | 62 |