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TOPCROP5b

Location: Lubeck

Australian Soil Classification: Endocalcareous-Endohypersodic, Epipedal, Yellow VERTOSOL

General Landscape Description: Level plain.
Site Description: Cropping paddock (field peas 2002, barley 2001)
Geology: Quaternary (Woorinen Formation) deposits.

Image: TOPCROP5 landscape
TOPCROP5 Landscape

Soil Profile Morphology:

Surface Soil

Ap0-5 cmDark greyish brown (10YR4/2); light medium clay; moderate medium polyhedral, parting to moderate fine polyhedral structure; strong consistence dry; pH 6.4:
No profile image exists for this profile. However see TOPCROP5a for a similar grey VERTOLSOL recorded in the same pit.
Subsoil

B215-20 cm Brown (10YR5/3) with faint brownish yellow (10YR6/6) mottles; medium clay; moderate to strong coarse blocky structure; slickensides present; strong consistence dry; slightly calcareous; pH 7.4:

B2220-60 cmLight yellowish brown (2.5Y6/4); heavy clay; moderate very coarse blocky structure as well some lenticular structure; strong consistence dry; very few (2%) soft and hard (1%) calcareous nodules; slightly calcareous; pH 8.6:

B2360-100 cmReddish yellow (7.5YR6/6&6/8) with light yellowish brown (10YR6/4) mottles; medium heavy clay; moderate coarse blocky structure; strong consistence dry; very few (2%) soft calcareous segregations and manganese flecks; moderately calcareous; pH 9.3.

NOTE: Large cracks throughout the profile.

Key Profile Features:

  • Clay texture throughout the profile.

Soil Profile Characteristics:

-


pH


Salinity
Surface
(A1 horizon)
Slightly Acid
Low
Non-Sodic
None1
Subsoil
(B21 horizon)
Slightly Alkaline
Low
Sodic
None2
Deeper Subsoil
(at 1 metre)
Very Strongly Alkaline
Low-Moderate
Strongly Sodic
Slight-Moderate
1 Slight-moderate dispersion after remoulding. 2 Slight dispersion after remoulding.
Image: TOPCROP5b graphs
The surface soil is slightly acid. The upper subsoil is slightly alkaline becoming very strongly alkaline with depth.The salinity rating is low in the surface soil becoming low to moderate in the deeper subsoil.The surface is non-sodic. The subsoil is sodic becoming strongly sodic with depth.The boron levels increase in the subsoil.The clay content is quite high throughout.

Chemical and Physical Analysis:

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Sodium Chloride
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
Ap
0-5
6.4
6.1
0.19
12
5.5
1.9
0.37
B21
5-20
7.4
6.9
0.26
<0.01
13
12
1.0
0.9
B22
20-60
8.6
8.0
0.41
<0.01
10
15
1.1
2.6
B23
60-100
9.3
8.6
0.49
0.01
4.6
12
0.8
4.5

Horizon
Horizon Depth
(cm)
Boron
mg/kg
Total
Nitrogen
%


Oxidisable Organic Carbon
%
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)
%
Ap
0-5
1.8
0.18
2.2
30.8
15.7
4
37
13
39
B21
5-20
2.7
38.3
20.3
2
26
9
59
B22
20-60
4.4
40.8
20.8
2
26
13
57
B23
60-100
37.2
18.8

Profile Described By:
Mark Imhof and Brooke Thompson (December 2007).
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