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MP38a

Location: Walpeup

Australian Soil Classification: Sodic, Hypercalcic, Red CHROMOSOL (medium sandy surface)

General Landscape Description: Swale between east-west dune.
Geology: Quaternary (Woorinen Formation) deposits.
Land Use: Cropping.

Image: MP38 and MP39 landscape
MP38 and MP39 Landscape


Soil Profile Morphology:

Surface Soil

A110-20 cmStrong brown (7.5YR4/6); loamy sand; weak blocky structure; very weak consistence dry; non calcareous; pH 7.9:
MP38a profile
MP38a Profile
A1220-25 cmDark brown (7.5YR3/4); sandy loam; weak coarse blocky structure; non calcareous; pH 8.1:
Subsoil
B2125-43 cmYellowish red (5YR4/6); sandy clay; weak coarse blocky structure; very firm consistence dry; moderately calcareous; pH 8.6:
B22k43-50 cmYellowish red (5YR5/8); light medium clay; very firm consistence dry; contains a few (2%) hard carbonates and a common (20%) amount of soft carbonate; very strongly calcareous; pH 8.9;
B23k50+ cmYellowish red (5YR5/8); light clay becoming light clay (sandy) with depth; weak coarse polyhedral structure; strong consistence dry; contains a few (2-5%) hard carbonates (5 mm in size) and very many (>50%) soft carbonates; very strongly calcareous; pH 9.6.
Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Slightly Alkaline
Very Low
Non Sodic
__
Subsoil
(B21 horizon)
--
--
Non Sodic
--
Deeper Subsoil
(at 50 cm)
--
--
--
--
1 Moderate dispersion after remoulding.

Image: MP38a graphs
The profile is non-sodic to 40 cm depth.There is a moderate increase in clay content at the A/B horizon boundary.
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
Exchangeable Cations
Total Nitrogen
%
Organic Carbon
%
Wilting Point
pF4.2
Coarse Sand
(0.2 - 2 mm)
Fine Sand
(0.02 - 0.2 mm)
Silt
(0.002 - 0.02 mm)
Clay
(<0.002 mm)
Ca
Mg
K
Na
meq/100g
A11
0-20
7.9
7.3
0.05
2.9
1
0.6
0.1
0.06
0.29
2.6
33
59
0
8
A12
20-25
6.5
1.6
1.1
0.1
5.6
37
44
4
16
B21
25-40
9.1
5.3
1
0.6
11.2
36
32
3
32
B22k
40-50
12
35
31
3
29

Profile Described By: Mark Imhof and Nathalie Baxter (September 1996).
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