Location: Horsham
Morphological Soil Type: Horsham Clay
Australian Soil Classification: Endohypersodic, Epipedal, Grey VERTOSOL
Northcote Factual Key: Ug 5.24
Great Soil Group: grey clay
Mapping Unit: Horsham Clay.
General Landscape Description: Level area in the flood plain (prior stream).
Site Description: The site was cleared and cultivated and occurs five kilometres east of Horsham in the original 'Youngs' and 'Riverside' Irrigation areas.
Geology: Late Tertiary to Quaternary Shepparton Formation.
Native Vegetation: Original vegetation may have been dominated by a Grey Box (Eucalyptus microcarpa) savanna woodland.
IS17 Landscape |
A1 | 0-10 cm | Dark grey (10YR4/1); light clay; subplastic; cracking and slightly self-mulching surface condition; moderate subangular blocky structure; strong consistence dry, slightly sticky consistence wet; contains very few (< 2 %) soft carbonates; pH 7.3; sharp and smooth change to: | IS17 Profile |
Subsoil | |||
B21 | 10-55 cm | Dark grey (10YR4/1); light clay; subplastic; moderate very coarse prismatic structure; strong consistence dry, moderately sticky consistence wet; pH 7.6; gradual change to: | |
B22 | 55-115 cm | Grey (2.5Y5/1); medium clay; plastic; weak subangular blocky structure; strong consistence dry, moderately sticky consistence wet; pH 7.6; gradual change to: | |
B23 | 115-180 cm | Light grey (2.5Y7/2); medium clay; plastic; weak subangular blocky structure; strong consistence dry, moderately sticky consistence wet; pH 8.5. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Alkaline | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Alkaline | High | Sodic | None1 |
Deeper Subsoil (at 1 m) | Slightly Alkaline | Very High | Strongly Sodic | None1 |
The profile is slightly alkaline throughout. | The salinity rating is low in the surface. The subsoil is high becoming very high with depth. | The surface is non-sodic. The 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 | 0–10 | 7.3 | NA | 0.19 | 0.04 | 13.2 | 8.4 | 1.9 | 0.9 | NA | 5.2 | 31.4 | 16.6 | 10 | 26 | 14 | 50 |
B21 | 10–55 | 7.6 | NA | 1.11 | 0.2 | 12.1 | 13.9 | 1.6 | 4.2 | NA | 4.9 | NA | 25.1 | 5 | 14 | 15 | 64 |
B22 | 55–115 | 7.6 | NA | 3.06 | 0.7 | 11.4 | 17.4 | 1.7 | 6.4 | NA | 3 | NA | 28.1 | 3 | 10 | 14 | 71 |
B23 | 115–180 | 8.5 | NA | 1.72 | 0.39 | 10.3 | 16.1 | 1.8 | 8.2 | NA | 1.8 | NA | 32.1 | 4 | 15 | 10 | 67 |