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CRC16

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Location: Lexton
Aust. Soil Class.: Magnesic, Mottled-Mesonatric, Brown SODOSOL (thick, sandy surface horizon)

General Site Description: Remnant low-level terrace between scald and creek, with some aeolian influence
Site Description: Grazing paddock
Geology: Quaternary alluvial sediments

Photo:  Landscape Photo Bet Bet soil pits 1, 2 and 3
CRC16 Landscape


Soil Profile Morphology:

Surface Soil



Photo:  Profile Photo Bet Bet soil pit 1
CRC16 Profile
A10-20 cmVery dark grey (10YR3/1); light fine sandy loam; weak medium subangular blocky, parting to weak fine subangular blocky structure; very weak consistence (dry); very few (<2%) fine angular quartz fragments; rough ped faces; moderately hydrophobic; pH 6.1; clear and smooth change to:
A2120-35 cmLight yellowish brown (10YR6/4) conspicuously bleached (10YR7/3 dry); light fine sandy loam; massive; weak consistence (dry); earthy fabric; pH 4.9; sharp and wavy change to:
A2235-45 cmPale brown (10YR6/3) conspicuously bleached (10YR8/2 dry); light fine sandy loam; massive; firm consistence (dry); very few (<2%) fine angular quartz fragments; earthy fabric; capping on prism tops; pH 5.1; sharp and wavy change to:

Subsoil
B145-60 cmStrong brown (7.5YR5/6) with many medium faint pale brown (10YR6/3) and brown (7.5YR4/4) mottles; light sandy clay loam; moderate very coarse columnar structure; strong consistence (dry); very few (<2%) fine subangular quartz fragments; rough-ped fabric; pH 6.3; clear and smooth change to:
B2160-80 cmBrown (7.5YR4/4) with many (40%) medium distinct light yellowish brown (10YR6/4) mottles; light clay (fine sandy); moderate very coarse prismatic, parting to moderate coarse angular blocky structure; strong consistence (dry); very few (<2%) fine subangular quartz fragments; rough-ped fabric; pH 6.5; clear and smooth change to:
B2280-105 cmLight yellowish brown (10YR6/4) with many medium distinct brown (7.5YR4/4), light brownish grey (10YR6/2) and reddish yellow (7.5YR6/6) mottles; fine sandy clay loam; weak very coarse subangular blocky structure; strong consistence (dry); rough-faced peds; many very fine macropores present; pH 6.6; gradual and smooth change to:
B23105-135 cmPale brown (10YR6/3) with many (40%) medium faint strong brown (7.5YR5/6) mottles; fine sandy clay loam; weak very coarse subangular blocky structure; very firm consistence (dry); rough-faced peds; many very fine macropores present; pH 7.2; clear and smooth change to:
2B21135-160 cmGrey (10YR6/1) with many (30%) medium distinct brown (7.5YR5/4) mottles; medium clay; weak very coarse subangular blocky, parting to weak medium subangular blocky structure; firm consistence (moderately moist); rough-faced peds; many very fine macropores present; pH 7.6; gradual and smooth change to:
2B22160-180 cmLight brownish grey (10YR6/1) with many (30%) coarse distinct reddish yellow (7.5YR6/6) mottles; silty clay loam; weak medium subangular blocky structure; weak consistence (moderately moist); smooth-faced peds; pH 7.5.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • Columnar structure evident in parts of upper subsoil.
Soil Profile Characteristics:


pH
Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Very Low
Non-Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Strongly Sodic
Strong-Complete
Deeper subsoil
(at 160-180 cm)
Slightly Alkaline
Low-Medium
Strongly Sodic
Strong

Photo:  Bet Bet 1 graphs

Horizon
Horizon Depth
pH
(water)
pH
CaCl2
EC
dS/m
NaCl
%
Exchangeable Cations
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2-2.0mm)
Fine Sand
(0.02-0.2mm)
Silt
(0.002-0.02mm)
Clay
(<0.002mm)
Ca
Mg
K
Na
meq/100g
A1
0-20
6.4
5.3
0.09
4.2
0.57
0.30
0.25
<10
8.7
18.0
6.5
14
67
12
2
A21
20-35
4.9
4.2
0.09
0.30
0.20
0.09
0.32
69
4.3
21.5
1.9
13
70
12
3
A22
35-45
5.1
4.3
0.06
0.11
0.12
0.05
0.23
43
1.9
19.0
5.3
12
71
13
3
B1
45-60
6.3
4.9
0.13
0.19
1.9
0.11
1.1
13
2.7
16.0
5.7
9
57
18
15
B21
60-80
6.5
4.9
0.23
0.33
7.0
0.26
3.4
13
6.3
28.5
1.9
4
39
17
38
B22
80-105
6.6
5.3
0.22
0.13
5.2
0.17
3.1
<10
3.7
24.0
9.8
3
58
16
22
B23
105-135
7.2
6.0
0.25
0.18
5.1
0.17
3.3
2.4
2
65
15
18
2B21
135-160
7.6
6.4
0.26
0.04
0.3
7.2
0.2
3.4
1
42
26
29
2B22
160-180
7.5
6.4
0.31
0.05
0.2
4.9
0.2
2.5
1
39
39
19

Notes:
  • Soil profile described by Mark Imhof, David Rees and Doug Crawford, (20/12/04).
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