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GN37

Location: Kyabram

Australian Soil Classification: Bleached-Vertic, Eutrophic, Grey DERMOSOL


Site Description: Kyabram Research Farm, edge of farm in disturbed area with trees.
GN37 landscape
GN37 Landscape

Soil Profile Morphology:

Surface Soil
A10-10/15 cmDark grey (10YR4/1); light clay to light clay (fine sandy); platey due to compaction; strong consistence dry; ferruginous and manganiferous staining; roots along plates; pH 7.5; clear change to:
GN37 profile
GN37 Profile
A210/15-40 cmGrey (10YR5/1) discontinuous; rusty root channel mottling; sporadic bleach in depression; light medium clay (fine sandy); weak-moderate very coarse prismatic, parting to moderate-strong medium blocky structure; firm consistence dry; few (2%) soft carbonates and medium to coarse (4-10 mm) carbonate nodules; macropores present; pH 7.6; wavy change to:
Subsoil
B2140-60 cmLight brownish grey (2.5Y6/2) with few (3%) faint light yellowish brown (2.5YR6/4) mottles; heavy clay; moderate fine to very fine lenticular structure; firm consistence moist; distinctive slickensides present; fine sand movement down cracks; pH 8.2; gradual change to:
B2260-110 cmLight yellowish brown (2.5YR6/3) with faint light yellowish brown (2.5YR6/4) mottles; heavy clay; weak consistence moist; pH 8.7; gradual change to:
B3110-160 cmStrong brown (7.5YR5/6) with light brownish grey (10YR6/2) mottles common; light clay to light medium clay; weak-moderate coarse polyhedral, parting to medium polyhedral structure; weak consistence moist; pH 8.3.

Soil Profile Characteristics:
pH
Salinity Rating
Surface Soil
(A11 horizon)
Slightly Alkaline
Extremely High
Sodic
-1
Upper Subsoil
(B21 horizon)
Moderately Alkaline
Medium-High
Sodic
-2
Deep Subsoil
(at 110-160 cm)
Moderately Alkaline
Very High
Non-Sodic
-
1 Moderate dispersion after remoulding. 2 Strong dispersion after remoulding.

GN37 graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Sodium Chloride
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10/15
7.5
6.6
2.2
0.35
8.9
13
9.9
4.1
A2
10/15-40
7.6
7.1
0.77
0.13
4.1
5.5
4.2
1.8
B21
40-60
8.2
7.7
0.71
0.12
4.4
7.2
2.4
1.8
B22
60-110
8.7
8.6
1.1
0.20
3.7
8.2
3.6
1.0
B3
110-160
8.3
7.4
1.4
0.31
3.2
7.8
3.7
0.7


Horizon
Horizon Depth
(cm)
Exchangeable Acidity
meq/100g
Field Capacity
pF 2.5
Wilting Point
pF 4.2
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
0-10/15
50.9
28.0
9
20
21
30
A2
10/15-40
2.5
12.5
1
30
20
35
B21
40-60
29.2
14.0
0
31
20
42
B22
60-110
33.2
16.3
0
23
25
47
B3
110-160

Profile Described By: Mark Imhof, Austin Brown, Nathan Robinson and Sonia Thompson (June 2005).
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