Location: Brucknell.
Australian Soil Classification: Vertic (& Sodic), Hypocalcic, Brown CHROMOSOL
Map Unit: Unit 145 (Maher and Martin, 1987).
General Landscape Description: Level plain.
Site Description: Grazing paddock (dairy).
Geology: Tertiary - Moorabool Viaduct Formation.
SW45 Landscape |
A1 | 0-15 cm | Very dark brown (10YR2/2); fine sandy clay loam; moderate medium blocky structure; weak to firm consistence moist; pH 6.1; clear change to: | SW45 Profile |
Subsoil | |||
B1 | 15-35 cm | Brown (10YR5/3) with a common amount of yellowish brown (10YR5/8) mottles; fine sandy light clay; moderate medium blocky structure; firm consistence moist; contains a few (5%) medium (2-4 mm in size) ferruginous nodules; pH 6.7; gradual change to: | |
B21 | 35-60 cm | Yellowish brown (10YR5/4) with a common amount of lighter yellowish brown (10YR5/6) mottles; medium heavy clay; moderate coarse blocky, parting to strong medium polyhedral structure; firm consistence moist; contains very few very coarse concretions; pH 7.3; gradual change to: | |
B22 | 60-80 cm | Light yellowish brown (2.5Y6/4) with a common amount of brownish yellow (10YR6/6) mottles; medium heavy clay; strong coarse blocky, parting to strong medium polyhedral structure; contains a few (5%) medium (2-5 mm in size) ferruginous nodules ; pH 7.6; gradual change to: | |
B3k | 80+ cm | Light grey (2.5Y7/0) with a common amount of brownish yellow (10YR6/8) mottles; medium clay; strong very coarse lenticular, parting to strong very fine lenticular structure; contains a few (5%) extremely coarse (up to 90 mm in size) carbonate/silica nodules; pH 8.4. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Alkaline | Very Low | Non-Sodic | None |
Deeper Subsoil (at 80+ cm) | Moderately Alkaline | Low | Sodic | None |
The surface is slightly acid. The subsoil is slightly alkaline becoming moderately alkaline at 80 cm depth. | The salinity rating is very low to low throughout the profile. | The surface and upper subsoil is non-sodic. The subsoil becomes marginally sodic at 50 cm depth. | The clay content increases gradually with depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH CaCl2 | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0.15 | 6.1 | 5.3 | 0.08 | 18 | 1.7 | 0.2 | 0.2 | |
B1 | 15-35 | 6.7 | 5.7 | 0.06 | 8 | 1.6 | 0.2 | 0.2 | |
B21 | 35-60 | 7.3 | 6.5 | 0.1 | 9.7 | 1.8 | 0.2 | 0.6 | |
B22 | 60-80 | 7.6 | 6.9 | 0.15 | 11 | 1.7 | 0.2 | 0.9 | |
B3k | 80+ | 8.4 | 7.9 | 0.35 | 0.04 | 13 | 2 | 0.2 | 1.5 |
Horizon | Horizon Depth (cm) | Oxidisable Organic Carbon % | Total Nitrogen % | 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 | 0.15 | 4.2 | 0.43 | 30.9 | 17.5 | 13 | 41 | 7 | 26 | |
B1 | 15-35 | 6.5 | 24.9 | 13.5 | 14 | 41 | 8 | 34 | ||
B21 | 35-60 | 32.4 | 19.5 | 12 | 30 | 6 | 51 | |||
B22 | 60-80 | 36.8 | 22.4 | 11 | 24 | 5 | 59 | |||
B3k | 80+ | 39.2 | 23.6 | 9 | 22 | 3 | 63 |