Location: Darriman. | Australian Soil Classification: Basic, Regolithic, Bleached-Orthic, TENOSOL/ Grey SODOSOL (thick sandy surface horizons). |
Geology: Pleistocene and Recent alluvium associated with Morris Creek. | General Landscape Description: Undulating plain (1-2% slope). Possibly a sand sheet or levee. |
Soil Mapping Unit: Woodside. | Site Description: Grazing paddock. |
Site GP45 Landscape |
A1 | 0-15 cm | Very dark grey (10YR3/1); loamy sand; weak coarse polyhedral, parting to weak medium polyhedral structure; weak consistence dry; pH 6.5; clear change to: | Site GP45 Profile |
A2 | 15-35 cm | Dark greyish brown (10YR4/2), conspicuously bleached (10YR7/2d) with faint yellowish brown (10YR5/6) mottles; loamy sand; massive structure; firm consistence dry; contains few (10%) subrounded quartz fragments (2-5 mm in size); pH 6.5; clear and wavy change to: | |
A3 | 35-55 cm | Brown (10YR5/3) with yellowish red (10YR5/6) mottles; loamy sand; massive structure; strong consistence dry; contains few (5-10%) sub-rounded quartz fragments (2-5 mm in size); roots to 40 cm; pH 6.9: | |
Subsoil | |||
B21 | 55-110 cm | Dark grey (10YR4/1) with yellowish brown (10YR5/6), dark brown (10YR2/2), and very dark grey (10YR3/1) mottles; clayey coarse sand; massive structure; weak consistence moist; contains many (25%) rounded quartz fragments (2-5 mm in size); pH 7.6: | |
Buried Subsoil | |||
2B2 | 110-130 cm | Grey (10YR6/1) with yellowish brown (10YR5/8) mottles; fine sandy clay; moderate coarse prismatic, parting to moderate coarse polyhedral structure; firm consistence moist; contains very few (< 2%) quartz fragments (2-5 mm in size); pH 8.0: | |
BC | 130+ cm | Grey (10YR5/1) with yellowish brown (10YR5/8) mottles; sandy loam; weak structure. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Slightly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Alkaline | Low | _ | _ |
Deeper subsoil (2B2 at 1.1 m) | Moderately Alkaline | Moderate | Strongly Sodic | Complete |
The surface soil is slightly acid. The subsoil is slightly alkaline becoming moderately alkaline by 1.2 m depth. | The salinity rating is very low in the surface soil and upper subsoil. The salinity rating for the deeper subsoil becomes moderate. | The clay content is low in the upper metre of the soil profile and then increases significantly. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-15 | 6.5 | 5.9 | 0.06 | 6.8 | 1.2 | 0.1 | 0.28 | |
A2 | 15-35 | 6.5 | 5.3 | 0.07 | 2 | 1.2 | 0.07 | 0.45 | |
12A2 | 35-55 | 6.9 | 5.8 | 0.08 | 1.7 | 1.6 | 0.07 | 0.57 | |
B21 | 55-110 | 7.6 | 6.4 | 0.11 | 1.6 | 2.3 | 0.08 | 0.94 | |
2B2 | 110-130 | 8 | 6.7 | 0.25 | 0.03 | 2 | 5.2 | 0.19 | 4.5 |
BC | 130+ |
Horizon | Horizon 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 | 0-15 | 6.3 | 43 | 36 | 9 | 6 | |||
A2 | 15-35 | 2.9 | 47 | 37 | 12 | 5 | |||
A2 | 35-55 | 3.4 | 47 | 37 | 10 | 9 | |||
B21 | 55-110 | 4.7 | 66 | 20 | 4 | 11 | |||
2B2 | 110-130 | 14.6 | 20 | 35 | 15 | 32 | |||
BC | 130+ |