SW66
Location: Irrewillipe
Australian Soil Classification: Melacic - Mottled (& Reticulate), Eutrophic, Brown CHROMOSOL
General Landscape Description: Gently inclined undulating rises.
Site Description: Crest above gentle slope.
Geology: Tertiary Hanson Plain Sand
 SW66 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-35 cm | Very dark grayish brown (10YR3/2 moist, 10YR5/2 dry); light fine sandy clay loam; weakly pedal; polyhedral (5-20 mm); very few (<2%), medium (2-10 mm) ironstone nodules; firm consistence; pH 5.3; clear and smooth change to: |  SW66 Profile. Note: Surface (A1) horizon has been stripped from the soil profile. |
| A2 | 35-55 cm | Yellowish brown (10YR5/4 moist), conspicuously bleached (10YR6/4 dry); sandy clay loam; apedal, massive; few (2-5%), medium (2-10 mm) ferruginous nodules; firm consistence; pH 5.5; abrupt and smooth change to: | |
| Subsoil |  | | |
| B21 | 55-95/105 cm | Strong brown (7.5YR5/8 moist) to yellowish brown (10YR5/8 dry); with many (~30%) dark yellowish brown (10YR4/6 moist) to yellowish brown (10YR5/6 dry) mottles; light medium clay; strongly pedal, very coarse (50-100 mm) polyhedral, parting to medium (5-20 mm) fine to very fine (2-5 mm) polyhedral structure; common (~10%) medium (2-10 mm) ferruginous nodules; very firm consistence; pH 5.9; clear and wavy change to: | |
B22 | 95/105-110 cm | Yellowish red (5YR4/6 moist) and red (10R4/6 and 4/8 moist); light to medium clay; strongly pedal, coarse (20-50 mm), parting to medium to fine (5-20 mm) polyhedral structure; few (~5%) medium (2-10 mm) ferruginous nodules; very firm consistence; pH 6.0; clear smooth change to: | |
B23 | 110-130 cm | Thin (~5 mm) grayish brown (2.5Y5/2 moist) clay lamellae (10-20 mm apart) fringed horizontally by a dark yellowish brown (10YR4/6 moist and dry) sand matrix in a red (10R4/8 moist) ferruginised sand matrix; moderately pedal, coarse polyhedral (20-50 mm), parting to medium to fine (5-20 mm) polyhedral structure; very firm consistence; gradual and wavy change to: | |
B24 | 130-155 cm | Thick [up to 15 mm] light gray (10YR7/1 moist and dry) and brownish yellow (10YR6/8) clay lamellae (10-20 mm apart) in a red (10R4/8 moist) and brown (10YR4/3) ferruginised sand matrix; weakly pedal; medium to fine (5-20 mm) polyhedral structure; weak to firm consistence; abrupt and wavy change to: | |
C/B | 155-200 cm | Thick [10-15 mm], clay lamellae (50-400 mm apart) in a ferruginised sand matrix; abrupt and smooth change to: | |
C | 200 cm+ | Mottled yellowish brown (10YR5/8 moist) and red (10R4/8 moist); ferruginised coarse sand. |
Tiger Mottles
Key Profile Features:
- Thick surface (A1) horizon.
- Strong texture contrast between surface (A) horizons and subsoil (B2) horizon.
- Deep tiger mottling with weathered Hanson Plain Sand visible at base.
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (A1 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Very Low | Non-Sodic | None |
Deeper subsoil (at 100-110+ cm) | Moderately Acid | Very Low | Non-Sodic | None |
| The surface is strongly acid. The subsoil is moderately acid. | | Salinity rating is very low throughout the profile. | | The soil is non sodic throughout. | | Exchangeable Aluminium levels are high in the surface soil. | | Clay levels jump markedly at the surface / subsoil boundary. |
Horizon | Sampling Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Organic Carbon % | Nitrogen % | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||||
meq/100g | ||||||||||
A1 | 0-35 | 5.3 | 4.5 | 0.09 | 3.6 | 0.21 | 3.1 | 0.57 | 0.09 | 0.18 |
A2 | 35-55 | 5.5 | 4.6 | <0.05 | | | 1.8 | 0.95 | 0.09 | 0.14 |
B21 | 55-100 | 5.9 | 5.3 | 0.07 | | | 2.9 | 7.1 | 0.12 | 0.37 |
B22 | 100-110 | 6 | 5.4 | 0.07 | | | 2.6 | 8.7 | 13 | 0.46 |
Horizon | Sampling Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | 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 | 0-35 | 57 | 13 | 19.8 | 7.1 | 27.2 | 40.5 | 14.5 | 12.5 |
A2 | 35-55 | 43 | 6.8 | 17.7 | 7.3 | 22.5 | 40.3 | 11.5 | 23 |
B21 | 55-100 | <10 | 12 | 36.4 | 25.7 | 9.5 | 14.1 | 6 | 70 |
B22 | 100-110 | <10 | 12 | 40.9 | 28.3 | 9 | 9.2 | 6.5 | 75.5 |
Profile Described By: Richard McEwan (April 1999).
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