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WW383

Location: Dimboola East

Australian Soil Classification: Sodic, Calcic, Black CHROMOSOL


General Landscape Description: Level plain.
Site Description: Fallow.
Native Vegetation: Savannah Woodland.
Geology: Neogene (Tertiary).


Soil Profile Morphology:

Surface Soil

A10-5 cm Dark brown (7.5YR3/2); light clay, fine sandy; weak medium blocky structure; weak consistence moist; pH 7.5; sharp change to:


Subsoil

B215-15 cmDark brown (7.5YR3/2); light medium clay, fine sandy; weak coarse blocky structure; pH 7.6; gradual change to:

B225-25 cmDark reddish brown (5YR3/2); light medium clay; weak coarse blocky structure; pH 7.8; sharp change to:

B3125-50 cmDusky red (2.5YR3/4); medium clay; weak fine blocky structure; contains very few carbonate nodules (2-6 mm in size); pH 8.4; sharp change to:

B3250-70 cmDark reddish brown (5YR3/4); medium clay; weak medium blocky structure; contains a few carbonate nodules (2-6 mm in size); pH 9.2; sharp change to:

B3370-90 cmStrong brown (7.5YR5/6); medium clay; weak coarse blocky structure; contains a few carbonate nodules (2-6 mm in size); very highly calcareous; pH 9.6; sharp change to:

B34k90-120 cmPale brown (10YR6/3); medium clay; weak fine blocky structure; common coarse carbonate nodules present (6-20 mm in size); very highly calcareous; pH 9.5.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Slightly Alkaline
Low
Non-Sodic
Subsoil
(B21 horizon)
Slightly Alkaline
Low
Non-Sodic
Deeper Subsoil
(at 90-120 cm)
Very Strongly Alkaline
High
Extremely Sodic



Image: WW383 graphs
The surface and upper subsoil are slightly alkaline. The deeper subsoil is very strongly alkaline.The surface has a low salinity rating. The upper subsoil has a low salinity rating becoming high at depth.The surface and upper subsoil are non-sodic. The deeper subsoil is strongly sodic becoming extremely sodic at depth.

Chemical and Physical Analysis:

Horizon
Horizon
Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
NaCl
%



Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-5
7.5
7.1
0.17
0.008
10
3.5
1.7
0.49
B21
5-15
7.6
7.2
0.2
0.014
12
3.9
1.8
0.64
B22
15-25
7.8
7.3
0.14
0.016
10
3.8
1.2
0.95
B31
25-50
8.4
7.7
0.26
0.02
15
7.6
1.8
3.4
B32
50-70
9.2
8.5
0.51
0.041
12
13
2.3
7.1
B33
70-90
9.6
8.8
0.73
0.073
6.2
12
2.1
9.2
B34k
90-120
9.5
8.8
1
0.125
5.3
11
2
11


Profile Described By: N.S. Badawy (March 1970).
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