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CRC5

Location: Warrayure

Australian Soil Classification: Natric, Dermosolic, Redoxic, HYDROSOL



Soil Profile Morphology:

Surface Soil


A10-3 cmVery dark brown (10YR2/2); fine sandy loam; weak consistence (dry); rusty root channel mottling; pH 6.3; abrupt change to:

Image: CRC5 Profile
Site CRC5 Profile
A213-13 cmDark greyish brown (10YR4/2); sporadically bleached; fine sandy clay loam; weak consistence (dry); rusty root channel mottling; pH 5.9; clear change to:

A2213-25 cmDark greyish brown (10YR4/2); sandy clay loam; weak consistence (moist); rusty root channel mottling; pH 6.8; clear change to:

Subsoil

B2125-40 cmBrown (10YR5/2); sandy clay; weak prismatic, parting to moderate coarse blocky structure (sand along some ped faces); weak consistence (moist); pH 7.5; gradual change to:

B2240-60 cmBrown (10YR5/3); sandy clay; moderate to strong very coarse prismatic structure (sand along some ped faces); firm consistence (moist); pH 7.6:

B2360-80 cmGreyish brown (10YR5/2) with brownish yellow (10YR6/8) mottles; light clay (sandy); moderate to strong very coarse prismatic structure; firm to very firm consistence (moderately moist) to strong consistence (dry); few (10%) ferro-manganiferous nodules (2-10 mm); pH 7.4:

B2480-100 cmPale brown (10YR6/3) with many brownish yellow (10YR6/8) mottles; light clay (sandy); firm consistence (moist); few (10%) ferro-manganiferous nodules (2-10 mm); pH 7.4:

B25100+ cmPale brown (10YR6/3) with many brownish yellow (10YR6/8) mottles; light medium clay (sandy); pH 7.2:

Key Profile Features:
  • Gradual increase in clay content (texture) down the profile.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Extremely High
Sodic
None
Subsoil
(B21 horizon)
Slightly Alkaline
Very High
Strongly Sodic
Moderate-Complete
Deeper subsoil
(at 100+ cm)
Slightly Alkaline
Medium
Strongly Sodic
Complete
Image: CRC5 Graphs



Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
NaCl
Exchangeable Aluminium
ppm
Exchangeable Acididty
meq/100g
Exchangeable Cations
Coarse Sand
(0.2-2.0 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
0-3
6.0
5.9
5.4
2.0
<10
8.2
7.6
7.0
0.3
1.9
17
39
16
7
A21
3-13
5.9
5.4
0.93
0.26
<10
3.6
2.2
2.4
<0.1
0.6
33
43
9
9
A22
13-25
6.8
6.2
0.79
0.21
<1.0
2.1
3.5
<0.1
1.1
25
46
16
12
B21
25-40
7.5
6.8
0.61
0.16
1.8
4.4
0.2
2.5
30
41
12
15
B22
40-60
7.6
6.9
0.63
0.16
2.1
5.3
0.3
2.6
28
41
17
12
B23
60-80
7.4
6.7
0.47
0.11
2.2
5.4
0.3
2.0
31
38
12
17
B24
80-100
7.4
6.6
0.29
0.07
2.2
5.4
0.3
1.6
B25
100+
7.4
6.4
0.34
0.08
2.1
5.2
0.3
1.8

Management Considerations:

Whole Profile
  • Much of the soil profile is likely to be saturated for a number of months in most years.
Surface (A) Horizons
  • The level of soluble salts is extremely high in the surface horizon.
Subsoil (B) Horizons
  • The coarsely structured, strongly sodic and dispersive subsoil is likely to restrict root and water movement.
  • The level of soluble salts is very high in the upper subsoil, and decreases down the profile.
Profile Described By: Mark Imhof, Austin Brown, Darren Bennetts and Malcolm McCaskill - March 2003.
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