Location: Richardson Hill | Aust. Soil Class.: Humose, Eutrophic, Red CHROMOSOL |
General Landscape Description: Crest of a low hill | Geology: Tertiary basalt. |
A1 | 0-25 cm | Dark brown (7.5YR3/3); fine sandy clay loam; moderate to strong coarse polyhedral, parting to strong fine polyhedral structure; weak to firm consistence dry; basalt fragments common (15-20%); pH 5.4 | GP57 Profile |
Subsoil | |||
B1 | 25-40 cm | Reddish brown (5YR4/4); light clay; strong medium polyhedral, parting to fine structure; weak to firm consistence dry; contains many (40-50%) basalt fragments (2-10 cm in size); pH 6.1 | |
B21 | 40-65 cm | Yellowish red (5YR4/6); medium heavy clay; strong medium polyhedral, parting to fine polyhedral structure; pH 6.1 | |
B22 | 65-110 cm | Pale red (2.5YR7/4) with yellowish red (5YR5/8) mottles; medium clay; moderate polyhedral, parting to fine lenticular structure; contains kaolinitic material; pH 5.0 | |
BC | 110+ cm | Light Grey (N7) with dusky red (2.5YR4/4) mottles |
Key Profile Features:
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Low-Moderate | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None1 |
Deeper subsoil (at 90 cm) | Strongly Acid | Very Low | Non-Sodic | None |
The surface horizon is strongly acid. The subsoil is slightly acid becoming strongly acid with depth. | The salinity rating in the surface soil is low to moderate. The subsoil is very low. | The exchangeable aluminium levels in the surface are low. At 55 cm depth the levels increase and become very high at depth. | The clay content increases markedly at the A/B boundary. |
Horizon | Horizon Depth | pH (water) | pH CaCl2 | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
Meq/100g | |||||||||
A1 | 0-25 | 5.4 | 4.9 | 0.25 | <0.03 | 11 | 3.7 | 1 | 0.3 |
B1 | 25-40 | 6.1 | 5.2 | 0.07 | 5.8 | 3.9 | 0.4 | 0.48 | |
B21 | 40-65 | 6.1 | 5.3 | 0.1 | 4.6 | 6.1 | 0.29 | 0.76 | |
B22 | 65-110 | 5 | 4.3 | 0.11 | 0.92 | 3.8 | 0.1 | 0.59 |
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) % |
A1 | 0-25 | 25 | 21 | 23.3 | 17 | 15 | 27 | 25 |
B1 | 25-40 | <10 | 15 | 16.1 | 31 | 19 | 17 | 26 |
B21 | 40-65 | <10 | 13 | 26.3 | 4 | 9 | 10 | 73 |
B22 | 65-110 | 220 | 6.4 | 26 | 17 | 11 | 13 | 57 |
Management Considerations: