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SWSL309

Site code
      SWSL309
Location
      Weerite (Princes Highway), Camperdown district, south-west Victoria
Landform
      Gently undulating basalt plains
Geology
      Quaternary Newer Volcanics: tuff rings, pyroclastic base surge and fall deposits consisting of ash, lapilli, scoria; well bedded and sorted, moderately consolidated
Element
      Flat

Soil Profile Morphology:

Horizon

Depth (cm)

Description

A1
0–25Very dark greyish brown (10YR3/2); clay loam; strong coarse granular structure; weak consistence (moderately moist); sharp boundary to:

B21
25–50Very dark grey (10YR3/1) with brown (10YR4/6) mottles; medium clay; strong coarse blocky structure; gradual boundary to:

B22
50–65Very dark greyish brown (10YR3/2) with brown (10YR4/6) mottles; heavy clay; strong coarse blocky structure; boundary to:

B23
65+Dark greyish brown (2.5Y4/2); heavy clay; strong coarse blocky structure.

ASC: Melanic, Mottled-Subnatric, Black SODOSOL

Analytical data Source: Government of Victoria, State Chemistry Laboratory.

Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
A1
0–25
5.5
N/R
0.08
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
25–50
6.1
N/R
0.08
N/R
7.3
13
0.38
1.8
N/R
6.9
B22
50–65
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B23
65+
7.2
N/R
0.11
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–25
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B21
25–50
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B22
50–65
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B23
65+
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Management Considerations:

Strong texture contrast between the surface soil and the subsoil is a very important soil feature. This can have a major effect by reducing and/or redirecting the internal drainage and restricting root growth beyond the upper horizons. Options include reduced tillage, improving organic matter content and altering the subsoil through artificial drainage (ripping, mole drainage) and/or chemical amelioration (gypsum) to improve structure.

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.
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