Property: Rutherglen Research Institute.
Paddock Number: 32.
Australian Soil Classification: Mottled-Sodic, Eutrophic, Yellow DERMOSOL
Northcote Factual Key: Gn 4.83
Great Soil Group: No suitable group.
General Landscape Description: Lower footslope (1% slope) of hill.
Soil Mapping Unit: Stillards loam
Site NE45 Landscape |
A1 | 0-10 cm | Strong brown (7.5YR4/6); fine sandy loam; hardsetting; weakly structured; firm consistence dry; pH 6.5; clear change to: | Site NE45 Profile |
A2 | 10-18 cm | Strong brown (7.5YR5/6) (7.5YR6/4d); light fine sandy clay loam; contains a common (10%) amount of ferromanganiferous nodules (2-10 mm size); firm consistence dry; pH 5.9; abrupt change to: | |
Subsoil: | |||
B1 | 18-35 cm | Reddish yellow (7.5YR6/6); fine sandy clay loam, becoming light clay with depth; weakly structured; very firm consistence dry; contains a few (2-5%) ferromanganiferous nodules; pH 6.8; gradual change to: | |
B21 | 35-70 cm | Brownish yellow (10YR6/8) with dark yellowish brown (10YR3/6) mottles; light medium clay; moderate medium polyhedral, parting to strong fine polyhedral structure; strong consistence dry; contains some patches of quartz from 50 cm depth; pH 6.8; clear change to: | |
B22 | 70-90 cm | Yellowish brown (10YR5/8) with yellowish brown (10YR5/6) mottles; medium heavy clay; moderate medium polyhedral, parting to strong fine polyhedral structure; strong consistence dry; contains a few (5-10%) manganese stains; pH 6.6; gradual change to: | |
B31 | 90-120 cm | Yellowish brown (10YR5/4) with bright yellowish brown (10YR5/8) mottles; medium heavy clay; moderate very coarse prismatic, parting to strong medium polyhedral structure; strong consistence dry; contains many (20%) manganese stains and patches of quartz gravel; pH 7.6; gradual change to: | |
B32 | 120 cm+ | Brown (10YR5/3) with yellowish brown (10YR5/6) and strong brown (7.5YR4/6) mottles; medium heavy clay; moderate very coarse prismatic, parting to strong medium polyhedral structure; strong consistence dry; contains a common (10%) amount of manganese stains; pH 8.5. |
The surface soil is slightly acid and the subsurface (A2) horizon is moderately acid. The upper subsoil is mainly slightly acid. The deeper subsoil gradually increases from slightly alkaline to moderately alkaline. | The upper part of the profile is non-sodic. At 80 cm depth the subsoil becomes sodic. The deep subsoil (120 cm+) is sodic and strongly dispersive. Also note the prismatic structure. | ||
There is a very low level of soluble salts throughout the profile. | The clay context increases gradually with depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Exchangeable Cations | Field Capacity pF 2.5 | Wilting Point pF 4.2 | Coarse Sand (0.2 - 2.0 mm) | Fine Sand (0.02 -0.2 mm) | Silt (0.002 -0.02 mm) | Clay (<0.002 mm) | |||
Ca | Mg | K | Na | |||||||||||
meq/100g | ||||||||||||||
A1 | 0-10 | 6.5 | 5.4 | 0.05 | 3 | 0.53 | 0.89 | 0.11 | 23 | 5 | 9 | 55 | 21 | 14 |
A1 | 10-18 | 5.9 | 5.1 | 0.08 | 2.9 | 0.58 | 0.41 | 0.11 | 20 | 6 | 10 | 51 | 25 | 17 |
B1 | 18-35 | 6.8 | 5.8 | <0.05 | 3.7 | 1.2 | 0.5 | 0.07 | 22 | 9 | 12 | 43 | 20 | 27 |
B21 | 35-70 | 6.8 | 5.8 | <0.05 | 4 | 3 | 0.52 | 0.21 | 27 | 12 | 8 | 36 | 15 | 42 |
B22 | 70-90 | 6.6 | 5.4 | 0.05 | 3.2 | 4.7 | 0.45 | 0.66 | 27 | 14 | 7 | 33 | 14 | 47 |
B31 | 90-120 | 7.6 | 5.9 | <0.05 | 3.9 | 6.4 | 0.55 | 1.5 | 9 | 17 | 5 | 30 | 13 | 51 |
B32 | 120+ | 8.5 | 6.8 | 0.06 | 4.8 | 8 | 0.59 | 2.4 | 32 | 18 | 5 | 29 | 13 | 53 |