Location: Horsham
Morphological Soil Type: Bungalally Clay
Australian Soil Classification: Episodic-Endocalcareous, Epipedal, Grey VERTOSOL
Northcote Factual Key: Ug 5.24
Great Soil Group: grey clay
Mapping Unit: Bungalally Clay.
General Landscape Description: Lake and lunette plain.
Site Description: Cleared and cultivated area, seven kilometres south east of Horsham.
Geology: Late Pleistocene to Holocene, lacustrine deposition. Quaternary Coonambidgal Formation: fluvial to lacustrine clays and sands
Native Vegetation: Original vegetation probably Black Box (Eucalyptus largiflorens).
IS21 Landscape |
A1 | 0-20 cm | Dark grey (10YR4/1); light medium clay; subplastic; cracking and self-mulching surface condition; moderate angular blocky structure; very strong consistence dry, slightly sticky consistence wet; pH 7.5; sharp and smooth change to: | IS21 Profile |
Subsoil | |||
B21 | 20-30 cm | Dark grey (10YR4/1); light clay; subplastic; strong very coarse prismatic structure; strong consistence dry, slightly sticky consistence wet; pH 8.2: | |
B22 | 30-65 cm | Dark grey (10YR4/1); heavy clay; plastic; strong very coarse prismatic structure; strong consistence dry, slightly sticky consistence wet; pH 8.3; gradual change to: | |
B23 | 65-135 cm | Grey (10YR5/1); heavy clay; plastic; moderate angular blocky structure; very strong consistence dry, slightly sticky consistence wet; contains very few (< 2 %) hard carbonates; pH 8.5; gradual change to: | |
B24 | 135-190 cm | Grey (10YR5/1); medium clay; plastic; moderate angular blocky structure; very strong consistence dry, slightly sticky consistence wet; pH 9.2. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Alkaline | Low | Sodic | Slight1 |
Subsoil (B21 horizon) | Moderately Alkaline | Low | Sodic | Slight1 |
Deeper Subsoil (at 1 m) | Moderately Alkaline | Medium-High | Strongly Sodic | Strong |
The surface soil is slightly alkaline. The subsoil is moderately alkaline. | The salinity rating is low in the surface and upper subsoil becoming high with depth. | The surface and upper subsoil is sodic becoming strongly sodic with depth. | The clay content is high throughout the profile. |
Horizon | Sample Depth cm | pH | EC dS/m | Sodium Chloride % | Exchangeable Calcium cmol-/kg | Exchangeable Magnesium cmol-/kg | Exchangeable Potassium cmol-/kg | Exchangeable Sodium cmol-/kg | Exchangeable Aluminium mg/kg | Exchangeable Acidity cmol-/kg | Field Capacity -30okPa | Permanent Wilting Point -1500okPa | Coarse Sand % | Fine Sand % | Silt % | Clay % | |
H2O | CaCl2 | ||||||||||||||||
A1 | 0–20 | 7.5 | NA | 0.19 | 0.02 | 19.8 | 10.5 | 3.5 | 2.6 | NA | 9.6 | NA | 30.2 | 1 | 11 | 5 | 81 |
B21 | 20–30 | 8.2 | NA | 0.2 | 0.02 | 20.6 | 11.5 | 3.5 | 5 | NA | 8.2 | NA | 35.5 | 1 | 5 | 5 | 87 |
B22 | 30–65 | 8.3 | NA | 0.41 | 0.07 | 19.1 | 11.3 | 3.5 | 6.5 | NA | 7.1 | NA | 33.7 | 1 | 7 | 3 | 86 |
B23 | 65–135 | 8.5 | NA | 0.88 | 0.18 | 13.9 | 12.8 | 3.5 | 8.8 | NA | 5.7 | NA | 33.5 | 1 | 8 | 4 | 87 |
B24 | 135–190 | 9.2 | NA | 1.03 | 0.21 | NA | NA | NA | NA | NA | NA | NA | 35.0 | 1 | 6 | 4 | 84 |