Mapsheet: ST. ARNAUD | Aust. Soil Class.: Magnesic, Subnatric, Red SODOSOL |
Northcote Factual Key: Dr 2.42 | Great Soil Group: red soloth |
General Landscape Description: Midslope of hill. Original vegetation included Red Stringybark (Eucalyptus macrorhyncha) and Grey Box (E. microcarpa). | |
Geology: Cambrian marine sediments (schistose, sandstone and shale). |
Soil Site LP 43 Landscape |
A1 | 0-12 cm | Strong brown (7.5YR4/6); light fine sandy clay loam; hardsetting when dry; weakly structured; very firm consistence dry; contains a few (5%) ferruginous siltstone fragments and quartz gravel; pH 5.2; clear change to: | Soil Site LP43 Profile |
A2 | 12-20 cm | Strong brown (7.5YR5/6) conspicuously bleached; light fine sandy clay loam; structureless; strong consistence (dry); pH 6.0; clear change to: | |
Subsoil | |||
B1 | 20-22 cm | Yellowish red (5YR5/8); clay loam (fine sandy); strong consistence dry; pH 6.2; abrupt change to: | |
B21 | 22-40 cm | Dark red (2.5YR4/6); light medium clay; moderate medium to coarse blocky, parting to strong fine blocky structure; very strong consistence dry; pH 6.2; clear change to: | |
B22 | 40-55 cm | Reddish brown (5YR5/4) and yellowish red (5YR5/6); light medium clay; moderate medium to coarse blocky, parting to strong fine blocky structure; strong consistence dry; contains a few (3%) siltstone fragments; pH 6.5: | |
C | 55 cm + | Weathered rock. |
pH | Salinity Rating | |||
Surface (A1 horizon) | strongly acid | very low | non-sodic | none1 |
Subsoil (B21 horizon) | slightly acid | very low | sodic | slight2 |
Deeper subsoil (at 40-55 cm) | slightly acid | very low | sodic | moderate |
Horizon | Horizon Depth | pH (water) | pH CaCl2 | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
Meq/100g | |||||||||
A1 | 0-12 | 5.2 | 4.4 | 0.1 | 0.9 | 0.8 | 0.4 | 0.1 | |
A2 | 12-20 | 6 | 4.5 | <0.05 | 0.4 | 0.7 | 0.2 | 0.1 | |
B1 | 20-22 | 6.2 | 4.7 | <0.05 | 0.7 | 1.4 | 0.2 | 0.2 | |
B21 | 22-40 | 6.2 | 4.7 | 0.05 | 0.8 | 5.1 | 0.5 | 0.9 | |
B22 | 40-55 | 6.5 | 5.4 | 0.11 | 0.3 | 8.2 | 0.6 | 1.6 |
Horizon | Horizon Depth | Ex Al mg/kg | Ex Ac meq/100g | Field pF2.5 | Wilting Point pF4.2 | Coarse Sand (0.2-2.0mm) | Fine Sand (0.02-0.2mm) | Silt (0.002-0.02mm) | Clay (<0.002mm) |
A1 | 0-12 | 25 | 6.8 | 21.8 | 4.8 | ||||
A2 | 12-20 | 18.5 | 3.8 | ||||||
B1 | 20-22 | ||||||||
B21 | 22-40 | 28.9 | 16.6 | ||||||
B22 | 40-55 |