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MM230

Site code

      MM230
Location
      Nalangil (Nalangil Road), Colac district, south-west Victoria
Landform
      Undulating rises
Geology
Element
      Flat

Profile morphology
Horizon

Depth (cm)

Description

A1
0–20
Black (10YR2/1); clay loam; very fine blocky structure; weak consistence (dry); clear boundary to:

B21
20–40
Black (10YR2/1); medium clay; strong fine blocky structure; smooth ped fabric; weak consistence (moderately moist); gradual boundary to:

B22
40–90
Very dark greyish brown (10YR3/2); medium clay; strong coarse blocky structure; smooth ped fabric; very firm consistence (moist); gradual boundary to:

B23
90–100
Brown (10YR4/3) with yellowish brown (10YR5/8) mottles; medium clay; firm consistence (moist); clear boundary to:

B24
100–110
Brown (10YR4/3) with yellowish brown (10YR5/8) mottles; medium clay; firm consistence (moist); common calcareous soft segregations; boundary to:

B25
110–140
Dark brown (10YR3/3); medium clay; apedal massive structure; very weak consistence (moist); clear boundary to:

B26
140–160
Dark greyish brown (2.5Y4/2); medium clay; apedal massive structure; very weak consistence (moist); clear boundary to:

B27
160+
Light olive brown (2.5Y5/4 moist); light clay; apedal massive structure; very weak consistence (moist).

ASC: Haplic, Calcic, Black Chromosol

Analytical data Source: Government of Victoria, State Chemistry Laboratory.

Site MM230
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
A1
0–20
5.5
N/R
0.08
N/R
4.9
4.9
0.6
0.6
0
22.5
B21
20–40
5.9
N/R
0.06
N/R
7
7
0.7
0.7
N/R
18.3
B22
40–90
7
N/R
0.06
N/R
N/R
N/R
N/R
N/R
N/R
11.4
B23
90–100
8
N/R
0.09
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B24
100–110
8.3
N/R
0.26
0.04
N/R
N/R
N/R
N/R
N/R
N/R
B25
110–140
8.5
N/R
0.11
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B26
140–160
8.3
N/R
0.07
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B27
160+
8.3
N/R
0.07
N/R
12
12
0.3
1.6
N/R
N/R

Site MM230
Sample
depth
FC
(-10kPa)
PWP
(-1500kPa)
KS
FS
Z
C
Org C
Bulk density
Horizon
cm
%
%
%
%
%
%
%
t m-3
A1
0–20
34.5
27.7
4
41
20
28
5
1.15
B21
20–40
39.5
30.6
5
31
12
48
N/R
1.09
B22
40–90
49.8
37.5
4
22
9
64
N/R
N/R
B23
90–100
N/R
N/R
4
23
9
61
N/R
N/R
B24
100–110
N/R
N/R
11
23
10
52
N/R
N/R
B25
110–140
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B26
140–160
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
B27
160+
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

Management considerations
Strong texture contrast between the surface soil and the subsoil is a very important soil feature. This can have a major effect by reducing and/or redirecting the internal drainage and restricting root growth beyond the upper horizons. Options include reduced tillage, improving organic matter content and altering the subsoil through artificial drainage (ripping, mole drainage) and/or chemical amelioration (gypsum) to improve structure.

Mottled subsoils are common and are an indication of periodic waterlogging, particularly if the mottles are pale (low oxygen conditions). Some brighter mottling may be due to past soil mixing and clay alluviation. Improved drainage, with the application of gypsum for sodic subsoils may be beneficial.

Alkaline subsoils are associated with a high nutrient capacity but result in an imbalance in nutrient availability (may be restrictive to certain plant species (e.g. potatoes). These soils are often associated with sodic and calcic soil properties. Growing alkaline tolerant species is a practical option.

Calcium carbonate nodules (segregations, soft and hard) are associated with alkaline soils. This secondary lime is often found in deep subsoils of many basalt-derived soils. As well as growing tolerant species, some micronutrients may be required to bolster essential macronutrients for more adequate plant growth (e.g. zinc).
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