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SW60

SW60 landscape
Trenched site showing clear transition from PODOSOL (near) to CHROMOSOL (far)
    Site Code
SW60

SW60 profile
Reticulate, Mesotrophic, Brown CHROMOSOL
    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
Ah
0-25Very dark greyish brown (10YR3/2 moist and dry); loamy sand, apedal, pH 5.1; abrupt and smooth boundary to:

A2
25-40 Brownish yellow (10YR6/8); sandy clay loam; massive; pH 6.0; clear and wavy change to:

B21t
40-70/90 Light olive brown (2.5Y5/3) ped exterior, yellowish brown (10YR5/6) to red (2.5YR5/8) interiors; medium clay; fine to coarse (5-30 mm) polyhedral structure; smooth ped faces; very firm consistence; pH 5.8; irregular and clear change to:

B/C
70/90+ Light grey (2.5Y7/1) ped exterior, with yellowish brown (10YR5/8) to yellowish red (5YR5/6) interiors conspicuous coarse (50-100 mm) reticulate mottling; very coarse to coarse (30-100 mm) polyhedral, parting to medium to fine (5-30 mm) polyhedral structure; smooth faced peds; pH 5.5.

Management considerations
This is one of the better soils of the dairying country in the south east of the region. It has generally higher clay content and better structure than other soils derived from the Hanson Plain Sand (compare SW61 Podosol and SW62 Hydrosol). Topsoils across all of the Hanson Plain Sand soils are very sandy and acid. The soil at this dairy farm will have had lime added, hence the favourable surface horizon pH. Low Ca:Mg ratio in the subsoil could limit plant growth. The change from one soil type to another is quite abrupt across the plains and it is virtually impossible to know the soil type at any point on the plain unless excavation is carried out.(See image upper left)

Analytical data
Site SW60
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
0-25
6.2
5.6
0.15
N/R
6.2
0.55
0.51
0.18
<10
9.3
17.6
7.4
29.3
45.6
12
7.5
A2
25-40
6
5.4
0.08
N/R
1.8
0.92
0.24
0.09
<10
4.3
15.5
8.9
27.1
40.9
8
24
B21
40-80
5.8
5.6
0.09
N/R
1.7
5
0.45
0.25
<10
8
32.7
24.4
15.4
17.6
6
57.5
B22
80-105
5.5
5.1
0.08
N/R
0.82
4.7
0.17
0.33
<10
6.8
31.7
21.1
25.1
16.2
3.5
52
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