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GN36

Location: Kyabram

Australian Soil Classification: Vertic, Calcic, Red CHROMOSOL * (Former gypsum site)

Great Soil Group: Red-brown Earth
Northcote Factual Key: Dr

General Landscape Description: Level plain (with prior streams).
Site Description: Kyabram Research Farm, pasture trials (Bay 0). Former gypsum site.
Geology: Quaternary prior stream deposits (Shepparton Formation).

GN36 landscape
GN36 Landscape

Soil Profile Morphology:

Surface Soil

A110-10 cmBrown (7.5YR4/4); fine sandy clay loam; weak-moderate coarse blocky, parting to medium blocky structure; very firm consistence dry; pH 6.6; clear change to:
GN36 profile
GN36 Profile
A1210-16 cmReddish brown (5YR4/4); fine sandy clay loam; moderate coarse sub-angular blocky, parting to strong fine to very fine polyhedral structure; very firm consistence dry; pH 6.4; abrupt change to:
Subsoil
B2116-55 cmDark red (2.5YR4/8); heavy clay; weak prismatic, parting to strong coarse blocky, parting to moderate medium sub-angular blocky structure; shiny ped faces; some slickensides and cracking present; strong consistence dry; macropores common; roots visible; pH 7.1; gradual change to:
B2255-80 cmReddish brown (5YR4/4); medium heavy clay; strong consistence slightly moist; slickensides present; pH 8.0; clear change to:
B3180-110 cmYellowish brown (10YR5/4); medium heavy clay (fine sandy); moderate strong blocky, parting to moderate medium to fine sub-angular blocky structure; strong to very strong consistence moist; few (2%) carbonate nodules (2-4 mm in size) as well as soft carbonate; pH 8.6; gradual change to:
B32110-150 cmYellowish brown (10YR5/4) with red (2.5YR5/6) mottles; few (5%) variable soft coarse (6-8 mm) manganese segregations; pH 9.0.


Soil Profile Characteristics:

pH
Salinity Rating
Surface Soil
(A11 horizon)
Slightly Acid
Very Low
Non-Sodic
None
Upper Subsoil
(B21 horizon)
Slightly Alkaline
Very Low
Non-Sodic
None
Deep Subsoil
(at 110-150 cm)
Very Strongly Alkaline
Very Low
Sodic
Strong-Complete

GN36 graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Sodium Chloride
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A11
0-10
6.6
6.1
1.4 *
<0.01
14 *
1.2
0.6
<0.01
A12
10-16
6.4
6.1
0.83 *
<0.01
9.7 *
0.8
0.5
<0.01
B21
16-55
7.1
7.1
0.70 *
<0.01
11 *
7.3
0.7
0.3
B22
55-80
8.0
8.0
0.66 *
0.01
10 *
15
0.8
2.4
B31
80-110
8.6
8.1
0.74 *
5.0 *
15
0.6
4.6
B32
110-150
9.0
8.9
0.14 *
5.1 *
13
0.84
3.6

NOTE: * Former gypsum site so the chemistry will not be representative of a typical soil profile in this area.

Horizon
Horizon Depth
(cm)
Organic Carbon
%
Nitrogen
%
Exchangeable Aluminium (KCL)
mg/kg
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)
A11
0-10
2.3
0.16
3.6
31.3
22.0
2
29
35
31
A12
10-16
<10
3.0
24.8
14.6
1
32
37
26
B21
16-55
2.9
32.1
18.6
0
13
13
59
B22
55-80
<1.0
34.0
19.1
0
10
25
57
B31
80-110
B32
110-150


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