Location: Richardson Hill | Aust. Soil Class.: Vertic, Mottled-Subnatric, Brown SODOSOL |
General Landscape Description: Lower midslope of down hill (10% slope). | Geology: Tertiary basalt. |
A11 | 0-15 cm | Very dark greyish brown (10YR3/2); fine sandy clay loam; moderate medium polyhedral, parting to fine structure; very firm consistence dry; pH 5.6; gradual change to: | GP58 Profile |
A12 | 15-25 cm | Dark brown (10YR3/3); clay loam; moderate medium polyhedral, parting to strong fine polyhedral structure; firm consistence dry; pH 6.2; abrupt change to: | |
Subsoil | |||
B21 | 25-80 cm | Dark brown (10YR3/3) with faint brownish yellow (10YR6/6) mottles; heavy clay; moderate very coarse polyhedral, parting to strong coarse polyhedral, blocky structure; slickensides with highly polished clay skins evident; strong consistence moist; pH 6.6; gradual change to: | |
B22 | 80+ cm | Dark greyish brown (10YR4/2) with red (2.5YR5/8) mottles; heavy clay; slickensides evident; strong consistence moist; pH 5.3. |
Key Profile Features:
pH | Salinity Rating | |||
Surface (A1 horizon) | Moderately Acid | Low | Non-Sodic | Slight |
Subsoil (B21 horizon) | Sightly Acid | Very Low | Marginally Sodic | None |
Deeper subsoil (at 80 cm) | Strongly Acid | Very Low | Sodic | None |
The surface horizon is moderately acid. The upper subsoil is slightly acid becoming strongly acid at 80 cm depth. | The salinity rating in the surface horizon is low becoming very low in the subsoil. | The exchangeable aluminium levels in the surface horizons are negligible becoming very high at 80 cm depth. | The clay content increases abruptly at the A/B boundary. |
Horizon | Horizon Depth | pH (water) | pH CaCl2 | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
Meq/100g | |||||||||
A11 | 0-15 | 5.6 | 4.9 | 0.13 | 6.5 | 3.1 | 0.74 | 0.56 | |
A12 | 15-25 | 6.2 | 5.1 | 0.05 | 5.5 | 4.1 | 0.19 | 0.61 | |
B21 | 25-80 | 6.6 | 5.5 | 0.07 | 6.3 | 10 | 0.26 | 1.6 | |
B22 | 80+ | 5.3 | 4.4 | 0.18 | 4.3 | 12 | 0.24 | 3.2 |
Horizon | Horizon Depth | Ex Al mg/kg | Ex Ac meq/100g | Wilting Point pF4.2 g/100g | Coarse Sand (0.2-2.0mm) % | Fine Sand (0.02-0.2mm) % | Silt (0.002-0.02mm) % | Clay (<0.002mm) % |
A11 | 0-15 | <10 | 10 | 18.4 | 8 | 26 | 32 | 25 |
A12 | 15-25 | <10 | 8.8 | 14.1 | 5 | 29 | 32 | 29 |
B21 | 25-80 | <10 | 9.9 | 27 | 2 | 13 | 14 | 67 |
B22 | 80+ | 230 | 14 | 27.8 | 2 | 15 | 17 | 64 |
Management Considerations: