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CFTT6

Site: YinnarLocation: APP species/seedlot trial VRV 142
Aust. Soil Class.: Bleached-Mottled, Magnesic, Brown KUROSOLGreat Soil Group: yellow soloth
Tech. Class: 021-6-42/4-1-2-32General Landscape Description: Simple 5% slope to north east.
Geology: Fault breccia? Cretaceous in origin?

Soil Profile Morphology:

Surface Soil

A10 – 10 cmBrown (10YR5/3), with few, mediu m, faint, pale brown (10YR6/3) mottles; clay loam; weak medium polyhedral structure; firm consistence, moderately moist; contains few subrounded, weathered siltstone gravels; pH 5.2; clear and sharp transition to:
CFTT6 profile
CFTT6 Profile
A210 – 40 cmLight yellowish brown (10YR6/4), with common, medium, distinct, brownish yellow (10YR6/6) mottles, fine sandy clay loam; massive structure, very firm consistence dry; contains few subrounded, weathered siltstone gravels; pH 5.3; clear and wavy transition to:
Subsoil
B2140 – 50 cmBrownish yellow (10YR6/6), with distinct, strong brown (7.5YR5/6) mottles common; light clay (increasing to light medium clay with depth); weak coarse polyhedral structure; very firm consistence moist; coarse subangular and tabular, weathered siltstone gravel common; pH 5.0; clear and wavy transition to:
B2250 – 80 cmBrown (10YR5/3) with many, coarse, prominent, dark grey (10YR4/1) and yellowish red (5YR4/6) mottles, medium heavy clay; moderate coarse polyhedral structure; strong consistence moist; contains many weathered siltstone cobbles; diffuse and smooth transition to:
B380 – 130 cmRed (2.5YR5/6), with many, coarse, prominent, dark grey (10YR4/1) and very pale brown (10YR8/3) mottles; medium heavy clay; moderate very coarse polyhedral structure; strong consistence moist; includes tongues of dark grey heavy clay extending into the decomposing red decomposing fractured rock; abundant cobbles (subangular tabular, weathered siltstone).


Key Profile Features:
  • Strong texture contrast between surface (A) horizons (<25% clay) and subsoil (B21) horizon (60% clay).
Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(B21 horizon)
Very Strongly Acid
Very Low
Non-Sodic
None

CFTT6 pH
The soil profile is strongly acid to very strongly acid throughout.
CFTT6 salinity
The soil profile has a very low salinity rating throughout.
CFTT6 exchangeable aluminium
The levels of exchangeable aluminium increase
in the very strongly acid subsoil to high levels.
CFTT6 clay
The clay content increases markedly at the A/B horizon interface.

Horizon
Horizon Depth
pH (water)
pH CaCl2
EC
1:5
NaCl
Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-10
5.2
4.3
0.1
1.9
1.5
0.22
0.32
A2
10-40
5.3
4.6
<0.05
0.58
1.1
0.06
0.17
B21
40-50
5
4.2
0.1
0.63
7.2
0.11
0.63

Horizon
Horizon Depth
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF 2.5
Wilting Point
pF4.2
g/100g
Coarse Sand
(0.2-2.0mm)
%
Fine Sand
(0.02-0.2mm)
%
Silt
(0.002-0.02mm)
%
Clay
(<0.002mm)
%
A1
0-10
88
14
30.1
9.3
10.4
36.1
28.5
17.5
A2
10-40
97
9.7
29
9
9.6
37.4
25
25
B21
40-50
260
13
41.6
25
12.3
16.1
8
59.5

Management Considerations:

  • The high exchangeable aluminium levels in the very strongly acid subsoil may affect the growth of aluminium sensitive species.
  • The subsoil has a very low exchangeable calcium:magnesium ratio (<0.1). Calcium deficiency may result.
Notes:
  • Weathered siltstone impeding at 130 cm. Profile looks like transported material over “breccia” material similar to Cretaceous mudstone, although redder in colour. This soil does not fit the description of Boolarra loam.
Profile Sampled by: Ian Sargeant and Justin Wong (2/6/99)
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