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MP4

Location: Walpeup

Australian Soil Classification: Endohypersodic, Pedal, Hypercalcic CALCAROSOL

Northcote Factual Key: Dr2.13

General Landscape Description: Open depression within a swale.
Site Description: Mallee Research Station lysimeter trial site. Completely cleared, pasture, cultivated as some stage in the past.


Photo: Soil Pit Site MP 4 Landscape

MP4 Landscape


Soil Profile Morphology:

Surface Soil
A10-10 cmReddish brown (5YR4/4); sandy loam; massive; very firm consistence dry; contains a few (2-10%) calcareous nodules; slight effervescence; pH 6.8; clear and smooth change to:

Photo: Soil Pit Site MP4 Profile
MP4 Profile

Subsoil


B2110-25 cmRed (2.5YR4/8); light medium clay; moderate medium prismatic, structure; very firm consistence dry; moderate effervescence; pH 8.1; diffuse and wavy change to:

B2225-65 cmRed (2.5YR4/8); light clay; moderate blocky structure; firm consistence dry; contains many (20-50%) soft calcareous segregations; very strong effervescence; pH 9.5; diffuse change to:
B2365- 200 cmOlive (5Y5/8); light clay; strong consistence dry; contains a few (2-10%) calcareous nodules; very strong effervescence; pH 9.7:
BC200+ cmHeavy clay; coarse peds; pipe structures; contains a slight amount of manganese nodules; pH 8.7.


Soil Profile Characteristics
:


pH
Salinity
Surface
(A1 horizon)
Slightly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Moderately Alkaline
Very Low
Non-Sodic
None
Deeper Subsoil
(at 1 metre)
Extremely Alkaline
High
Extremely Sodic
Moderate

Image: MP4 graphs

The surface horizon is slightly acid. The subsoil is moderately to strongly alkaline.The salinity rating in the surface is low. The subsoil is also low becoming high with depth.The surface and upper subsoil is non sodic. The deeper subsoil becomes extremely sodicA sharp increase in clay occurs at the A/B horizon interface

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
0-15
6.8
5.9
0.07
3.5
1.5
0.7
<0.1
A2
15-20
8.1
7.4
0.09
7.5
4.4
1.3
0.4
A3
20-21
9.5
8.3
0.31
<0.05
6.2
9.6
1.4
3.7
B21
21-35
9.7
8.4
0.95
0.13
2.6
6.4
1.2
7.6
B22
35-65
8.7
8.2
0.86
0.28
1.1
11.3
2.6
12.6

Horizon
Horizon Depth
(cm)
Oxidisable Organic Carbon
%
Total
Nitrogen
%
Field
Capacity
pF2.5
Wilting
Point
pF4.2
Coarse Sand
(0.2-2.0 mm)
%
Fine Sand
(0.02-0.2 mm)
%
Silt
(0.002-0.02 mm)
%
Clay
(<0.002 mm)
%
A1
0-15
0.5
0.06
50
33
1
13
9.8
4.9
A2
15-20
40
26
3
25
16.8
10.9
A3
20-21
32.1
21.4
B21
21-35
28.3
19.9
B22
35-65
36.0
25.3


Profile Described By: Mark Imhof (March 1994).





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