SW44
Location: South Ecklin.
Australian Soil Classification: Bleached-Vertic, Eutrophic, Yellow CHROMOSOL.
General Landscape Description: Gently undulating plain
Site Description: Grazing paddock (dairy).
Mapping Unit: Unit 155 (Maher and Martin, 1987).
Geology: Tertiary - Moorabool Viaduct Formation.
 SW44 Landscape |
Soil Profile Morphology:
Surface Soil
| O | 0-12 cm | Root mat: |  SW44 profile |
| A1 | 12-20 cm | Dark brown (7.5YR3/2); fine sandy loam; pH 5.7: | |
| A2 | 20-35 cm | Light yellowish brown (10YR6/4) conspicuously bleached, with a few (10%) strong brown (7.5YR5/8) and yellowish brown (10YR5/8) mottles; fine sandy clay loam; contains a few (5%) ferruginous nodules (5-15 mm in size); pH 5.9: | |
| Subsoil | |||
| B21 | 35-50 cm | Light yellowish brown (10YR6/4) with a common (20%) amount of strong brown (7.5YR5/6) mottles; light medium clay; strong coarse blocky, parting to strong medium polyhedral structure; firm consistence moist; contains a few (10%) ferruginous nodules (2-40 mm in size); pH 6.0: | |
| B22 | 50-80 cm | Light yellowish brown (10YR6/4) with a common amount of yellow (10YR7/8) mottles; medium clay; moderate coarse prismatic, parting to strong coarse blocky and medium polyhedral structure; contains very few (2-5%) ferruginous nodules (up to 50 mm in size); pH 6.1: | |
| B3 | 80+ cm | Light grey (10YR7/1) with many yellow (10YR7/8) mottles; medium clay; strong coarse lenticular, parting to strong fine lenticular structure; slickensides present; pH 7.0. | |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
- | pH | Salinity | ||
Surface Soil (A1 horizon) | Moderately Acid | Low | Non-Sodic | None |
Subsoil (35-50 cm) | Moderately Acid | Low | Non-Sodic | None |
Deeper Subsoil (80+ cm) | Neutral | Low | Sodic | Slight |
 |  |  |
| The surface and upper subsoil is moderately acid. The subsoil becomes neutral at 80 cm depth. | The salinity rating is very low throughout the profile. | The clay content increases markedly at 35 cm depth. |
Chemical and Physical Analysis:
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Organic Carbon % | Total Nitrogen % | Exchangeable Cations | Coarse Sand (0.2-2.0 mm) % | Fine Sand (0.02-0.2 mm) % | Silt (0.002-0.02 mm) % | Clay (<0.002 mm) % | Field Capacity % w/w | Wilting Point % w/w | |||
Ca | Mg | K | Na | |||||||||||||
meq/100g | ||||||||||||||||
A1 | 12-20 | 5.7 | 4.8 | 0.06 | 3.4 | 0.21 | 3.9 | 0.3 | 0.1 | 0.05 | 14 | 53 | 17 | 8 | 25.9 | 7.8 |
A2 | 20-35 | 5.9 | 5.0 | <0.05 |  | | 1.4 | 0.8 | 0.05 | 0.05 | 12 | 56 | 17 | 15 | 18.9 | 5.6 |
B21 | 35-50 | 6.0 | 5.3 | 0.1 | | | 4.3 | 4.4 | 0.1 | 0.4 | 8 | 33 | 10 | 48 | 29.8 | 18.6 |
B22 | 50-80 | 6.1 | 5.6 | 0.12 | | | 5.1 | 4.3 | <0.1 | 0.5 | 6 | 25 | 9 | 60 | 36.9 | 22.9 |
B3 | 80+ | 7.0 | 6.3 | 0.14 | | | 7.5 | 4 | 0.1 | 1.3 | 8 | 24 | 9 | 59 | 37.3 | 22.4 |
Profile Described By: Mark Imhof and Austin Brown (August 1998).
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