Location: Cowwarr. | Australian Soil Classification: Melanic, Eutrophic, Black DERMOSOL. |
Geology: Holocene fluvial deposits. | General Landscape Description: Level plain (0-1% slope). |
Mapping Unit: Thomson. | Site Description: Dairy grazing paddock. |
Site GP62 Landscape |
A11 | 0-25 cm | Very dark greyish brown (10YR3/2); fine sandy loam; strong medium polyhedral, parting to fine polyhedral structure; weak consistence dry; pH 5.7; gradual change to: | Site GP62 Profile |
A12 | 25-40 cm | Very dark greyish brown (10YR3/2); fine sandy clay loam; strong medium polyhedral, parting to fine polyhedral structure; firm consistence dry; pH 6.4; gradual change to: | |
Subsoil | |||
B21 | 40-60 cm | Very dark brown (10YR2/2); light clay; weak coarse prismatic, parting to strong medium to fine polyhedral structure; very firm consistence dry; pH 5.9; gradual change to: | |
B22 | 60-100 cm | Dark brown (10YR3/3) (with a bleached appearance on some ped faces); light clay (silty); moderate coarse prismatic, parting to strong medium polyhedral structure; strong consistence dry; pH 5.8; gradual change to: | |
B23 | 100-120 cm | Dark greyish brown (10YR4/2) with brown (7.5YR4/4) mottles and a bleached appearance on some ped faces; light clay silty; moderate coarse prismatic, parting to strong coarse polyhedral structure; strong consistence dry; manganese stains common; pH 6.6. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Moderate | Non-sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Very Low | Non-sodic | None |
Deeper subsoil (at 1 m) | Slightly Acid | Very Low | Non-sodic | None |
The surface and upper subsoil is moderately acid. The deeper subsoil becomes slightly acid. | The profile is non-sodic throughout. | ||
The surface salinity rating is moderate. The subsoil salinity rating is very low throughout. | The clay content increases gradually with depth. |
Horizon | Horizon Depth
(cm) | pH
(water) | pH
(CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A11 | 0-25 | 5.7 | 5.1 | 0.22 | 10 | 2.9 | 0.24 | 0.29 | |
A12 | 25-40 | 6.4 | 5.6 | 0.09 | 8.3 | 4.4 | 0.14 | 0.29 | |
B21 | 40-60 | 5.9 | 4.9 | 0.09 | 5.7 | 6.1 | 0.14 | 0.44 | |
B22 | 60-100 | 5.8 | 4.8 | 0.08 | 4.1 | 6.1 | 0.13 | 0.42 | |
B23 | 100-120 | 6.6 | 5.5 | 0.1 |
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) |
A11 | 0-25 | <10 | 11 | 10.9 | 2 | 52 | 19 | 18 | |
A12 | 25-40 | -28 | 8.7 | 12.2 | 2 | 41 | 25 | 25 | |
B21 | 40-60 | <10 | 11 | 16.3 | 2 | 17 | 36 | 39 | |
B22 | 60-100 | <10 | 3.4 | 15.4 | 2 | 18 | 38 | 38 | |
B23 | 100-120 |