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SW61

SW61 landscape
Sharp boundary (at <3 m depth) between overlying Hanson Plain Sand and underlying Gellibrand Marl represents a throttle to downward percolation of water in this landscape.
    Site Code
SW61
SW61 profile
Melacic, Humic/Humosesquic, Semiaquic PODOSOL
    Location
South of Simpson: Cooriemungle Road and Princetown Road
    Landform
Gently undulating plain
    Geology
Neogene Hanson Plain Sand Formation
    Element
Level to slightly sloping plain
    Slope
<1%
    Aspect
0
Horizon
Depth (cm)
Description
A1
0–45 Black (7.5YR2.5/1 moist, 7.5YR3/1 dry); loamy fine sand; apedal structure; pH 4.2; clear and smooth boundary to:

A2
45–65/75 Grey (10YR5/1 moist); light grey (10YR7/1 dry); loamy medium sand; apedal structure; pH 4.4; abrupt and irregular boundary to:
B21h
65/75–90 Black (7.5YR2.5/1 moist and dry); sandy loam; massive structure; pH 4.2; clear and wavy boundary to:

B22hs
90–100/110 Very dark brown (10YR2/2 moist); cemented sand (‘coffee rock’); massive; pH 4.5; abrupt and wavy boundary to:

B23s
100/110+Mottled yellow (2.5Y7/6 moist), yellowish brown (10YR5/8 moist) and dark red (2.5YR4/8 moist) mottling; cemented sand; massive; pH 4.8.

Management considerations
Extremely acid profile is typical for this type of soil. The bleached A2 horizon is “spewy” and weak when wet and very hard when dry. The B horizon ‘coffee rock’ acts as a barrier to water movement and to root growth. Compare this profile with SW60.

Analytical data
Site SW61
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
0-10
4.2
3.1
0.11
N/R
0.71
1.1
0.45
0.37
42
18
N/R
N/R
33.5
42.8
14.5
3
A2
45-70
4.4
3.6
<0.05
N/R
<0.05
0.15
0.05
0.07
<10
1.5
N/R
N/R
34.1
47.8
18.5
<1
B21
70-90
4.2
3.3
0.09
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
29.6
44.8
17
5.5
B22
90-105
4.5
4.1
0.1
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B23
105+
4.8
4.8
0.09
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
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