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SW33

SW33 landscape
Grazing paddock (dairy)
    Site Code
SW33
SW33 profile
Humose-Acidic, Dermosolic, Redoxic HYDROSOL

    Location
Kawarren
    Landform
Level plain.
    Geology
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.

Analytical data
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
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