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COF01

COF01a landscape
Rolling low hills near Johanna
    Site Code
COF01a
COF01a profile
Acidic, Eutrophic, Grey DERMOSOL (Clayey)
    Location
Johanna
    Landform
Rolling low hills
    Geology
Neogene Hanson Plain Sand: fluvial gravel, sand , silt
    Element
Upper slopes
    Slope
26%
    Aspect
south-east
Horizon
Depth (cm)
Description
A1
0-20
Dark brown (10YR3/3); light medium clay; strong fine polyhedral, parting to strong fine granular structure; weak consistence (moderately moist); pH 5.4; many medium roots; gradual and wavy boundary to:

B21
40-80
Dark greyish brown (10YR4/2) with common medium distinct yellowish brown (10YR5/8) mottles; medium heavy clay; moderate coarse polyhedral, parting to weak fine polyhedral structure; firm consistence (moderately moist); pH 5.3; many medium roots; gradual and wavy boundary to:

B22
80-110
Dark greyish brown (10YR4/2) with many medium distinct yellowish brown (10YR5/8) and very pale brown (10YR7/3) mottles; light medium clay; moderate coarse polyhedral, parting to moderate medium polyhedral structure; firm consistence (moderately moist); pH 5.1; many medium roots; clear and wavy boundary to:

B23
110-140
Light grey (10YR7/2) with many very coarse distinct strong brown (7.5YR5/8) mottles; light clay; massive structure; very firm consistence (moderately moist); pH 5.0; few very fine roots:

140-200
Similar to above.

200-800
Similar to above but harder, old remnant roots observed 2.5 - 3.0 m; no live roots observed; live roots observed at 2 m; notice impeding layer; roots don't like it.

Management considerations
This soil site is acid throughout the soil profile and has high levels of exchangeable aluminium in the subsoil. Acidic subsoils generally occur on acidic parent material or where there has been sufficient leaching of the soil. These subsoils affect nutrient availability, creating a nutrient imbalance and the potential for aluminium and manganese toxicity. 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. Where the acidity is deep, acid tolerant plants are a practical option.

Analytical data
Site COF01
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex Acidity
FC
–10kPa
PWP
–1500kPa
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
5.4
4.6
0.07
N/R
5.8
4.3
0.99
0.21
82
14
37.3
17.3
2.1
19.8
32.5
40.0
B21
40-80
5.3
4.2
0.06
N/R
5.6
7.2
1.3
0.27
300
14
39.7
21.5
0.5
12.5
28.0
57.0
B22
80-110
5.1
4.1
0.07
N/R
3.0
7.0
0.94
0.29
990
19
43.9
27.2
0.8
14.2
35.0
50.5
B23
110-140
5.0
4.1
<0.05
N/R
1.4
5.2
0.50
0.22
820
15
35.6
11.8
4.2
48.2
25.5
19.5
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