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LS21 east


Location: Baker


Australian Soil Classification: Episodic-Epicalcareous (and Magnesic), Epipedal, Brown VERTOSOL

Northcote Factual Key: Ug 5.2
Great Soil Group: grey clay

General Landscape Description: Gently Undulating Plain.
Site Description: Hollow component within a gilgaied plain.
Native Vegetation: Black Box and Lignum Bush occur in undisturbed areas.

Image: LS21e Landscape
LS21 east Landscape



Soil Profile Morphology:

Surface Soil

A10-10 cmDark greyish brown (10YR4/2); medium clay; firm consistence dry; pH 9.3Image: LS21e Profile
LS1 east Profile
Subsoil
B2110-50 cmBrown (7.5YR5/4); medium clay; strong coarse prismatic, parting to strong coarse blocky structure; firm consistence moist; pH 9.5
B2250-80 cmLight yellowish brown (10YR6/4) with yellowish brown (10YR5/8) mottles; medium heavy clay; moderate coarse lenticular structure; firm consistence moist; pH 9.4
B2380+ cmLight yellowish brown (2.5YR6/4); light medium clay; strong coarse lenticular structure; pH 9.1


Soil Profile Characteristics:

-

pH
Salinity
Surface
(A1 horizon)
Very Strongly Alkaline
Medium
Strongly Sodic
None*
Subsoil
(B21 horizon)
Very Strongly Alkaline
Extremely High
Strongly Sodic
Slight
Deeper Subsoil
(at 1 metre)
Very Strongly Alkaline
Extremely High
Strongly Sodic
-
* Strong dispersion after remoulding.
Image: LS21e Graphs
The profile is very strongly alkaline throughout.The salinity rating is medium in the surface and extremely high in the subsoil.The profile is strongly sodic throughout.

Chemical and Physical Analysis:

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Na Cl
%
Exchangeable Cations
Total Nitrogen
%
Organic Carbon
%
Field Capacity
pF 2.5
Wilting Point
pF 4.2
Ca
Mg
K
Na
meq/100g
A1
0-10
9.3
8.4
0.66
0.1
10.2
9.5
2
4.9
0.13
1.3
32.1
24.2
B21
10-50
9.5
9.2
1.81
0.32
2.6
12
1.9
11.5
42.5
29.7
B22
50-80
9.4
8.8
1.13
0.44
2.9
14
2.1
11.1
B23
80+
9.1
8.8
2.5
0.52
2.3
16
2.4
12.8


Management Considerations:

Surface (A) Horizons
  • Moderately saline surface conditions are likely to restrict plant growth.

Subsoil (B) Horizons
  • High level of soluble salts in the subsoil are likely to be harmful to salt sensitive species.
  • Strongly sodic conditions restrict plant growth. High level of soluble salts is the subsoil will restrict dispersion.
  • The calcium/magnesium ratio for the subsoil is very low (approx. 0.1) and may result in plant nutrient imbalance, e.g. magnesium toxicity or calcium deficiency.
Profile Described By: Mark Imhof, David Rees, Sonia Thompson (October 1994).
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