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| SW33 | Humose-Acidic, Dermosolic, Redoxic HYDROSOL | |
| Kawarren | |||
| Level plain. | |||
| Quaternary sediments overlying Tertiary - Dilwyn Formation | |||
Horizon | Depth (cm) | Description | ||
A1 | 0-20 | Greyish brown (10YR3/2); rusty root channel mottling present; very fine sandy clay loam; weak to moderate coarse blocky, parting to moderate medium blocky structure; weak consistence moist; pH 5.1: | ||
B21 | 20-45 | Brown (10YR5/3) with yellowish brown (10YR5/8) mottles; light clay; moderate medium polyhedral structure; weak consistence moist; pH 4.9: | ||
B22 | 45-100 | Grey (10YR5/1) with yellowish brown (10YR5/6) mottles; medium clay; strong medium polyhedral, parting to strong fine polyhedral structure; weak consistence moist; pH 4.7. | ||
Management considerations | ||||
Acidic soils (topsoil and subsoil) are often associated with acidic parent material or where there has been sufficient leaching of the soil, due the lack of base minerals and may or may not have organic matter (humose or peaty surfaces). Their acidic nature restricts the uptake of certain nutrients as well as intolerance for some plant species (due in part to the increasing mobilisation of aluminium and manganese). The application of lime is the main method of increasing the pH, reducing toxic levels of nutrients to plants while increasing the availability of nutrients such as calcium, potassium and molybdenum. Mottled subsoils are common and are an indication of periodic waterlogging, particularly if the mottles are pale (low oxygen conditions). Some brighter mottling may be due to past soil mixing and clay alluviation. Improved drainage, with the application of gypsum for sodic subsoils may be beneficial. |
Site SW33 | Sample depth | pH | EC | NaCl | Ex Ca | Ex Mg | Ex K | Ex Na | Ex Al | Ex acidity | FC (-10kPa) | PWP (-150kPa) | KS | FS | Z | C | |
Horizon | cm | H2O | CaCl2 | dS/m | % | cmolc/kg | cmolc/kg | cmolc/kg | cmolc/kg | mg/kg | cmolc/kg | % | % | % | % | % | % |
A1 | 0-20 | 5.1 | 4.4 | 0.13 | N/R | 3.9 | 0.9 | 0.2 | 0.05 | N/R | N/R | 28.7 | 11.2 | 9 | 50 | 14 | 24 |
B21 | 20-45 | 4.9 | 4.2 | 0.12 | N/R | 2.5 | 1.6 | 0.2 | 0.05 | N/R | N/R | 29.2 | 13.6 | 10 | 41 | 10 | 38 |
B22 | 45-80 | 4.7 | 4 | 0.16 | N/R | 1.6 | 3.3 | 0.3 | 0.2 | N/R | N/R | 38.8 | 21.2 | 7 | 26 | 7 | 57 |
B23 | 80-100 | 4.7 | 3.9 | 0.13 | N/R | 1.2 | 3.7 | 0.2 | 0.2 | N/R | N/R | N/R | N/R | 8 | 27 | 8 | 54 |