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CLRA8

CLRA8 landscape
Soil pit atop dissected plateau in the Heytesbury district

    Site Code
CLRA8


CLRA8 profile
Haplic, Eutrophic, Brown Kurosol
    Location
Timboon (Timboon Curdie Vale Road), Heytesbury district, south-west Victoria
    Landform
Dissected plateaux
    Geology
Neogene Port Campbell Limestone: marine calcarenite, marl
    Element
Mid slope
    Slope
3%
    Aspect
North-west
Horizon
Depth (cm)
A11
0–10Very dark greyish brown (10YR3/2); very fine sandy clay loam; apedal single grain structure; rough ped fabric; firm consistence (moderately moist); non-calcareous, pH 8; gradual smooth boundary to:

A12
10–17Dark greyish brown (10YR4/2) with brownish yellow (10YR6/6) mottles due to bioturbation; light medium clay; strong very fine subangular blocky structure; rough ped fabric; weak consistence (moist) and very firm consistence (dry); clear smooth boundary to:

B21
17–55Yellowish brown (10YR5/4); medium clay; strong very fine polyhedral structure; rough and smooth ped fabric; weak consistence (moderately moist) and strong consistence (dry); non-calcareous, pH 7; clear smooth boundary to:

B22
55–80Light olive brown (2.5Y5/4) with few brownish yellow (10YR6/6) mottles; medium heavy clay; strong fine and medium lenticular structure; smooth ped fabric; slickenside cutans; weak consistence (moist) and strong consistence (dry); non-calcareous, pH 5.5; clear smooth boundary to:

B23
80–100Olive brown (2.5Y4/4) with many olive yellow (2.5Y6/6) mottles; medium clay; strong fine and medium lenticular structure; smooth ped fabric; mangans and slickenside cutans; weak consistence (moist) and strong consistence (dry); non-calcareous, pH 6; abrupt smooth boundary to:

C
100+Very highly calcareous, pH 8.5.

Management considerations

This soil is strongly texture contrast with a shallow surface soil. This is an acidic profile overlying calcareous parent material due mainly to the relatively high rainfall of the area. The subsoil has restricted drainage (colour, mottling) due to the high clay content of the subsoil and despite the limestone below. Nutrient levels are high particularly in the lower subsoil and the surface nutrient status has been altered by management to improve nutrient availability by increasing the pH.


The shallow surface soil has limited depth for root penetration but high organic matter (10% OM) without which it would set hard (poor structure).

The soils is quite stable, slightly less in the surface [Emerson 3(1)] compared with the subsoil [Emerson 5].
Analytical data
Site CLRA8
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
%
%
%
%
%
%
A11
0–106.86.30.26
N/R
174.52.60.76
N/R
N/R
50.5
26.3
5.933.925.522
B21
25–455.14.40.19
N/R
135.71.60.94
N/R
N/R
49.8
29.8
2.418.71362
B22
60–7554.50.36
N/R
217.61.11.6
N/R
N/R
58.9
37.1
2.613.512.566.5
B23
85–1006.45.90.42
N/R
367.11.12
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
C
100+
8.37.80.37
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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