Location: Richardson Hill. | Australian Soil Classification: Endoacidic-Mottled, Epipedal, Brown VERTOSOL. |
Geology: Basalt. | General Landscape Description: Edge of a depression or a low lying area (0-1% slope). |
Mapping Unit: Merricks Clay. |
GP57-GP60 Landscape |
A1 | 0-10 cm | Brown (10YR4/3); light medium clay; surface cracking (up to 2 cm wide); moderate medium polyhedral structure; strong consistence dry; pH 5.7: | Site GP60 Profile |
Subsoil | |||
B21 | 10-20 cm | Brown (10YR4/3); medium clay; strong medium polyhedral, parting to fine structure; strong consistence dry; pH 5.9: | |
B22 | 20-30 cm | Very dark greyish brown (10YR3/2); rusty root channel mottling evident; heavy clay; strong coarse prismatic, parting to strong fine polyhedral, parting to coarse blocky structure; firm consistence moist; pH 5.7: | |
B23 | 30-80 cm | Dark brown (10YR3/3) with faint yellowish brown (10YR5/6) mottles; heavy clay; weak consistence wet; slickensides evident; pH 4.7: | |
B24 | 80 + cm | Greyish brown (10YR5/2) with yellowish brown (10YR5/6) mottles; heavy clay; firm consistence wet; pH 4.4. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Moderate | Non-Sodic | None |
Subsoil (B21 horizon) | Moderately Acid | High | Non-Sodic | None1,2 |
Deeper subsoil (at 90 cm) | Extremely Acid | High | Sodic | None,2 |
The surface horizon is moderately acid becoming extremely acid at 80 cm depth. | The salinity levels of the surface horizon is moderate becoming high in the subsoil. | The exchangeable aluminium levels in the surface are negligible becoming high at about 40 cm and very high at 80 cm. | The clay content increases gradually with depth then drops marginally. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-10 | 5.7 | 5.3 | 0.67 | 0.1 | 16 | 12 | 0.6 | 1 |
B21 | 10-20 | 5.9 | 5.5 | 0.97 | 0.19 | 13 | 12 | 0.9 | 1.4 |
B22 | 20-30 | 5.7 | 5.4 | 1.3 | 0.31 | 9.7 | 14 | 0.9 | 2 |
B23 | 30-80 | 4.7 | 4.5 | 1.7 | 8 | 17 | 0.7 | 2.4 | |
B24 | 80+ | 4.4 | 4.1 | 1.7 | 0.41 | 4 | 11 | 0.3 | 1.9 |
Horizon | Horizon Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | 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) |
A1 | 0-10 | <10 | 18 | 29 | 10 | 11 | 0 | 39 | |
B21 | 10-20 | <10 | 16 | 26 | 3 | 15 | 20 | 49 | |
B22 | 20-30 | <10 | 5.5 | 30 | 1 | 10 | 12 | 66 | |
B23 | 30-80 | 130 | 15 | 35 | 1 | 6 | 7 | 76 | |
B24 | 80+ | 240 | 6.2 | 28 | 1 | 13 | 14 | 66 |