SW61

SW61 landscape
Sharp boundary (at <3 m depth) between overlying Hanson Plain Sand and underlying Gellibrand Marl represents a throttle to downward percolation of water in this landscape.

Site Code

SW61

Melacic, Humic/Humosesquic, Semiaquic PODOSOL

Location

South of Simpson: Cooriemungle Road and Princetown Road

Landform

Gently undulating plain

Geology

Neogene Hanson Plain Sand Formation

Element

Level to slightly sloping plain

Slope

<1%

Aspect

Horizon

Depth (cm)

Description

0–45

Black (7.5YR2.5/1 moist, 7.5YR3/1 dry); loamy fine sand; apedal structure; pH 4.2; clear and smooth boundary to:

45–65/75

Grey (10YR5/1 moist); light grey (10YR7/1 dry); loamy medium sand; apedal structure; pH 4.4; abrupt and irregular boundary to:

B21h

65/75–90

Black (7.5YR2.5/1 moist and dry); sandy loam; massive structure; pH 4.2; clear and wavy boundary to:

B22hs

90–100/110

Very dark brown (10YR2/2 moist); cemented sand (‘coffee rock’); massive; pH 4.5; abrupt and wavy boundary to:

B23s

100/110+

Mottled yellow (2.5Y7/6 moist), yellowish brown (10YR5/8 moist) and dark red (2.5YR4/8 moist) mottling; cemented sand; massive; pH 4.8.

Management considerations

Extremely acid profile is typical for this type of soil. The bleached A2 horizon is “spewy” and weak when wet and very hard when dry. The B horizon ‘coffee rock’ acts as a barrier to water movement and to root growth. Compare this profile with SW60.

Analytical data

Site SW61

Sample
depth

NaCl

Ex Ca

Ex Mg

Ex K

Ex Na

Ex Al

Ex acidity

FC
(-10kPa)

PWP
(-150kPa)

Horizon

H₂O

CaCl₂

dS/m

cmol_c/kg

mg/kg

cmol_c/kg

0-10

4.2

3.1

0.11

N/R

0.71

1.1

0.45

0.37

N/R

33.5

42.8

14.5

45-70

4.4

3.6

<0.05

N/R

<0.05

0.15

0.05

0.07

<10

1.5

N/R

34.1

47.8

18.5

B21

70-90

4.2

3.3

0.09

N/R

29.6

44.8

5.5

B22

90-105

4.5

4.1

0.1

N/R

B23

105+

4.8

0.09

N/R

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Sharp boundary (at <3 m depth) between overlying Hanson Plain Sand and underlying Gellibrand Marl represents a throttle to downward percolation of water in this landscape.		Site Code	SW61	Melacic, Humic/Humosesquic, Semiaquic PODOSOL
		Location	South of Simpson: Cooriemungle Road and Princetown Road
		Landform	Gently undulating plain
		Geology	Neogene Hanson Plain Sand Formation
		Element	Level to slightly sloping plain
		Slope	<1%
		Aspect	0
Horizon	Depth (cm)	Description
A1	0–45	Black (7.5YR2.5/1 moist, 7.5YR3/1 dry); loamy fine sand; apedal structure; pH 4.2; clear and smooth boundary to:
A2	45–65/75	Grey (10YR5/1 moist); light grey (10YR7/1 dry); loamy medium sand; apedal structure; pH 4.4; abrupt and irregular boundary to:
B21h	65/75–90	Black (7.5YR2.5/1 moist and dry); sandy loam; massive structure; pH 4.2; clear and wavy boundary to:
B22hs	90–100/110	Very dark brown (10YR2/2 moist); cemented sand (‘coffee rock’); massive; pH 4.5; abrupt and wavy boundary to:
B23s	100/110+	Mottled yellow (2.5Y7/6 moist), yellowish brown (10YR5/8 moist) and dark red (2.5YR4/8 moist) mottling; cemented sand; massive; pH 4.8.
Management considerations
Extremely acid profile is typical for this type of soil. The bleached A2 horizon is “spewy” and weak when wet and very hard when dry. The B horizon ‘coffee rock’ acts as a barrier to water movement and to root growth. Compare this profile with SW60.