SW37
Location: Irrewillipe
Australian Soil Classification: Epiacidic, Epipedal, Black VERTOSOL
Map Unit: Map Unit 116 (Maher and Martin, 1987).
General Landscape Description: Level plain with Swamp Gum (E. ovata).
Site Description: Grazing paddock.
Geology: Quaternary sediments overlying Tertiary - Moorabool Viaduct Formation.
 SW37 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-25 cm | Black (10YR2/1); heavy clay loam; strong medium blocky structure; firm consistence moist; pH 5.5: |  SW37 Profile |
| Subsoil |  | | |
| B21 | 25-60 cm | Very dark brown (10YR2/2); medium clay; strong coarse blocky, parting to strong medium blocky structure; very firm consistence moist; pH 5.5: | |
| B22 | 60-95 cm | Dark greyish brown (10YR4/2) with dark yellowish brown (10YR4/4) mottles; medium heavy clay; strong fine lenticular, parting to strong very fine lenticular structure; weak consistence moist; pH 5.8; wavy change to: | |
| B23 | 95+ cm | Very dark grey (10YR3/1) with yellowish brown (10YR5/6) mottles; medium heavy clay; strong fine lenticular, parting to strong very fine lenticular structure; weak consistence moist; pH 5.5. |
Key Profile Features:
- Clay texture throughout the soil profile.
- The profile will display significant shrinking and swelling during wetting and drying cycles. Strong cracking will occur due to shrinking.
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (A1 horizon) | Strongly Acid | Low | Non-Sodic | None |
Subsoil (B21 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (at 95+ cm) | Strongly Acid | Very Low | Non-Sodic | None |
 The whole profile is strongly acid. |  The salinity rating is low to very low throughout the profile. |  The clay content remains fairly constant throughout. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC (dS/m) | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A1 | 0-25 | 5.5 | 4.9 | 0.18 | 11 | 3.1 | 0.4 | 0.2 |
B21 | 25-60 | 5.5 | 4.7 | 0.1 | 3.7 | 5.5 | 0.2 | 0.3 |
B22 | 60-95 | 5.8 | 4.8 | 0.1 | 2.9 | 7.4 | 0.2 | 0.8 |
B23 | 95+ | 5.5 | 4.6 | 0.13 | 2.5 | 6.9 | 0.2 | 1.3 |
Horizon | Horizon Depth (cm) | Acidity meq/100g | Oxidisable Organic Carbon % | Total Nitrogen % | 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 | 0-25 | 16 | 6.4 | 0.53 | 45.9 | 27 | 6 | 14 | 21 | 45 |
B21 | 25-60 | | 2.6 | 0.18 | 43.1 | 25.1 | 2 | 10 | 25 | 59 |
B22 | 60-95 | | | | 44.8 | 25.3 | 1 | 7 | 22 | 66 |
B23 | 95+ | | | | 42.7 | 23.3 | 2 | 11 | 21 | 60 |
Profile Described By: Mark Imhof and Austin Brown (June 1998).
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