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MP39

Location: Walpeup

Australian Soil Classification: Bleached-Sodic, Hypercalcic, Red KANDOSOL (thick, sandy surface horizons). This profile overlies an older soil profile.

General Landscape Description: Crest of an east-west dune.
Geology: Quaternary (Woorinen Formation) deposit).


Image:  MP38 and MP39 landscape

MP38 and MP39 landscape


Soil Profile Morphology:

Surface Soil

A10-15 cmBrown (7.5YR5/4); sand; apedal (structureless); loose consistence slightly moist; non calcareous; pH 8.5:
MP39 profile
MP39 profile
A215-40 cmReddish yellow (7.5YR7/6) pink (7.5YR7/4d); sand; apedal (structureless); loose consistence slightly moist; non calcareous; pH 8.8; sharp and wavy change to:
Subsoil
B140-75 cmReddish yellow (7.5YR6/6) with many faint yellow (10YR6/6) mottles; clayey sand; weakly structured; weak consistence slightly moist; contains very few (<2%) soft carbonates; very highly calcareous; pH 8.8; clear and wavy change to:
B2175-100 cmYellowish red (5YR5/8) with few faint light yellowish brown (10YR6/4) mottle and common very faint yellow (10YR7/6) mottle; sandy clay loam; weakly structured; firm to very firm consistence dry; contains a few (2%) soft carbonates; very highly calcareous; pH 8.9:
B22k100-125 cmReddish yellow (7.5YR6/6) with pale yellow (2.5Y7/4); sandy loam; weakly structured; very firm consistence dry; soft carbonate common (10-20%); very highly calcareous; pH 9.3:
B31k125-155 cmPale yellow (2.5Y7/4) with reddish yellow (7.5YR6/6); sandy clay loam; moderate coarse blocky, parting to moderate medium blocky structure; smooth fabric; firm consistence dry; contains many (20-50%) soft and hard carbonates; very highly calcareous; pH 9.5:
B32155+ cmPinkish grey (5YR6/2); sandy clay loam; moderate coarse blocky structure; smooth fabric; contains soft and hard carbonate; very highly calcareous.


Soil Profile Characteristics:


pH
Salinity Rating
Surface
(A1 horizon)
Moderately Alkaline
Very Low
--
__
Subsoil
(B21 horizon)
Strongly Alkaline
Very Low
Non Sodic
None1
Deeper Subsoil
(at 100+ cm)
Very Strongly Alkaline
Very Low
Sodic
--
1 Moderate dispersion after remoulding.


Image: MP39 graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCI
%
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
A1
0-15
8.5
7.7
<0.05
1.3
0.4
0.2
0.1
0.03
0.11
1.2
35
60
0
5
A2
15-40
8.8
8.1
<0.05
          
          
          
          
0.9
B1
40-75
8.8
8.2
0.08
4.3
2.1
0.3
0.1
4.9
28
58
0
14
B21
75-100
8.9
8.3
0.11
3.8
4.9
0.6
0.2
6.9
26
55
0
22
B22k
100-125
9.3
8.5
0.11
          
          
          
          
7.2
27
48
0
22
B31k
125-155
9.5
8.5
0.21
<0.05
4
6.3
0.8
1.3
23
44
1
28


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