SW48
Location: Wangoom
Australian Soil Classification: Bleached-Vertic (& Ferric), Eutrophic, Brown CHROMOSOL
General Landscape Description: Gently undulating rise.
Site Description: Lower slope
Mapping Unit: Unit 170 (Maher and Martin, 1987).
Geology: Quaternary - Newer volcanics (basalt).
 SW48 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-5 cm | Very dark brown (10YR2/2); fine sandy clay loam; contains many (40%) ferruginous nodules (2-5 mm in size); pH 5.7; clear change to: |  SW48 Profile |
| A2 | 5-25 cm | Brown (10YR5/3), conspicuously bleached; gravely sandy loam; contains very many (80%) ferruginous nodules (2-15 mm in size); pH 6.4; sharp change to: | |
| Subsoil |  | | |
| B21 | 25-50 cm | Dark yellowish brown (10YR4/4) with yellowish brown (10YR5/6) and some red (2.5YR5/8) mottles; medium clay; strong coarse polyhedral, parting to strong medium polyhedral and strong lenticular structure; weak to firm consistence moist; pH 6.6; gradual change to: | |
| B22 | 50-70 cm | Yellowish brown (10YR5/4) with yellowish brown (10YR5/6) and red (2.5YR5/8) mottles common; medium clay; strong coarse polyhedral, parting to strong medium polyhedral and medium to fine lenticular structure; pH 6.3; gradual change to: | |
| B23 | 70-105 cm | Light brownish grey (10YR6/2) with many yellowish brown (10YR5/8) and red (2.5YR5/8) mottles; medium clay; strong coarse polyhedral, parting to strong medium polyhedral and medium to fine lenticular structure; pH 5.8; gradual change to: | |
| B24 | 105+ cm | Light grey (N6) with red (2.5YR5/8) and common strong brown (7.5YR5/6) mottles; light clay; strong coarse polyhedral, parting to strong fine polyhedral and medium to fine lenticular structure; weathered volcanic material present; pH 5.3. |
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 | Medium | Non-Sodic | None |
Subsoil (25-50 cm) | Slightly Acid | Very Low | Non-Sodic | None |
Deeper Subsoil (105+ cm) | Moderately Acid | Low | Sodic | None |
 The surface is moderately acid. The subsoil is slightly acid becoming moderately acid at 1m. |  The salinity rating is low throughout the soil profile. |  The clay content increases sharply at 25 cm depth. |
Chemical and Physical Analysis:
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Organic Carbon % | Total Nitrogen % | Exchangeable Acididty meq/100g | 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 | 0-5 | 5.7 | 4.9 | 0.22 | 7.6 | 0.51 | | 7 | 2 | 1 | 0.1 | 19 | 26 | 21 | 19 | 38.3 | 17.1 |
A2 | 5-25 | 6.4 | 5.5 | 0.07 | | | | 2.7 | 1 | 0.4 | 0.05 | 40 | 25 | 18 | 14 | 21.2 | 8.0 |
B21 | 25-50 | 6.6 | 6.1 | 0.19 | | | 11 | 5.5 | 7.9 | 0.2 | 0.6 | 2 | 4 | 6 | 83 | 51.5 | 34.7 |
B22 | 50-70 | 6.3 | 6.0 | 0.23 | | | | 3.4 | 8.7 | 0.1 | 0.6 | 1 | 3 | 7 | 88 | 53.0 | 36.5 |
B23 | 75-105 | 5.8 | 5.4 | 0.21 | | | | 2.2 | 8.2 | 0.1 | 0.8 | 2 | 6 | 7 | 82 | 50.5 | 33.9 |
B24 | 105+ | 5.3 | 4.8 | 0.19 | | | | 1.1 | 5.7 | <0.1 | 0.8 | 8 | 16 | 13 | 63 | 46.9 | 30.9 |
Profile Described By: Mark Imhof and Austin Brown, August 1998.
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