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 |
| [/p>]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 (50-20 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%), fine to medium (2-10 mm) ferruginous nodules; very firm consistence; pH 6.0; clear smooth change to: | |
B23 | 110-130 cm | Thin (~5 mm) greyish 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 greyish brown (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 | Sodicity | Dispersion |
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 |
 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-35 | 5.3 | 4.5 | 0.09 | | 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 | Horizon Depth (cm) | Ex Al mg/kg | Ex Ac meq/100g | Field 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 |
© State of Victoria (Agriculture Victoria) 1996 - .
This work, Victorian Resources Online, is licensed under a Creative Commons Attribution 4.0 licence. You are free to re-use the work under that licence, on the condition that you credit the State of Victoria (Agriculture Victoria) as author, indicate if changes were made and comply with the other licence terms.
The licence does not apply to ‘branding’ or some ‘images or photographs’ that may be owned by third parties. We ask you to seek prior approval to use images using the VRO feedback form. Access to higher quality images can also be provided on request.
This page was last updated on .