Location: Delburn. | Australian Soil Classification: Acidic, Mesotrophic, Brown DERMOSOL. |
Great Soil Group: brown podsolic. | Geology: Mid-Tertiary sediments - probably includes basalt derived colluvium. |
General Landscape Description: Simple 2% slope to north west. | Mapping Unit: Silver Creek. |
A1 | 0 – 15 cm | Dark brown (7.5YR3/4); clay loam; moderate coarse granular, parting to strong medium granular structure; very weak consistence moist; pH 4.9; gradual and smooth transition to: | Site CFTT8 Profile |
Subsoil | |||
B21 | 15 – 30 cm | Dark brown (7.5YR3/4); light clay; moderate coarse polyhedral, parting to strong medium polyhedral structure; weak consistence moist; pH 4.9; diffuse and smooth transition to: | |
B22 | 30 – 70 cm | Brown (7.5YR4/4); light medium clay; weak very coarse polyhedral structure; weak consistence moist; pH 4.1; gradual and smooth transition to: | |
B23 | 70 – 120 cm | Yellowish brown (10YR5/4) with common distinct, strong brown (7.5YR5/6) and dusky red (7R4/3) mottles; medium clay; strong coarse subangular blocky, parting to strong medium subangular blocky structure; very firm consistence moist; pH 5.3; diffuse and smooth transition to: | |
B24 | 120 – 190 cm | Yellowish brown (10YR5/4) with many, coarse sized, distinct, strong brown (7.5YR5/6) and dusky red (7R4/3) mottles, medium clay; strong coarse subangular blocky, parting to strong medium subangular blocky structure; very firm consistence moist. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Very strongly acid | Very low | Non-sodic | none |
Subsoil (B21 horizon) | Very strongly acid | Very low | Non-sodic | none |
Deeper subsoil (at 1 m) | Strongly acid | Very low | Non-sodic | none |
The soil profile is very strongly to strongly acid throughout. | The levels of exchangeable aluminium are high in the upper subsoil and decrease below one metre depth. | ||
The salinity rating is very low throughout the soil profile. | The clay content increases gradually with depth down the soil profile. Clay contents are high throughout. |
Horizon | Horizon Depth (cm) | pH water | pH CaCl2 | EC 1:5 | Exchangeable Cations | Ex. Al mg/kg | Ex. Acidity meq/100g | Field Capacity pF 2.5 | Wilting Point pF 4.2 | Coarse Sand (0.2 -2.0 mm) | Fine Sand (0.02-0.2 mm) | Silt (0.002-0.02 mm) | Clay (<0.002 mm) | |||
Ca | Mg | K | Na | |||||||||||||
meq/100 g | ||||||||||||||||
A1 | 0-15 | 4.9 | 4.2 | 0.08 | 1.5 | 1.9 | 0.40 | 0.27 | 250 | 29 | 44.5 | 23.4 | 6 | 17 | 22 | 46 |
B21 | 15-30 | 4.9 | 4.3 | 0.08 | 1 | 1.9 | 0.21 | 0.26 | 270 | 28 | 41.2 | 23.9 | 4 | 16 | 20 | 50 |
B22 | 30-70 | 5.1 | 4.4 | 0.08 | 0.75 | 2.6 | 0.8 | 0.31 | 260 | 22 | 40.5 | 25.3 | 2 | 13 | 16 | 62 |
B23 | 70-120 | 5.3 | 4.6 | 0.07 | 0.92 | 4.2 | 0.07 | 0.43 | 100 | 15 | 47.1 | 31.6 | 4 | 11 | 13 | 68 |