CLRA9

Plateaux dissected with creek valley near Timboon		Site Code	CLRA9	Haplic, Eutrophic, Red Kurosol
		Location	Timboon (Timboon Curdie Vale Road), Heytesbury district, south-west Victoria
		Landform	Dissected plateaux
		Geology	Neogene Port Campbell Limestone: marine calcarenite, marl
		Element	Upper slope
		Slope	22%
		Aspect	West-south-west
Horizon	Depth (cm)	Description
A11	0–10	Very dark greyish brown (10YR3/2); very fine sandy clay loam; strong fine to coarse subangular blocky structure; rough ped fabric; strong consistence (dry); pH 7; boundary to:
A12	10–23	Dark brown (10YR3/3); light clay; strong fine to coarse polyhedral structure; rough and smooth ped fabric; strong consistence (dry); pH 7; clear irregular boundary to:
B21	23–75	Dark reddish brown (5YR3/3); medium clay; strong very fine to fine polyhedral and lenticular structure; smooth ped fabric; strong consistence (dry); pH 5.5; sharp wavy boundary to:
C	75+	Rock
Management considerations
This soil is texture contrast with a moderately deep surface soil and moderate soil depth (less than 1 metre), which has the potential for restricted drainage. This is an acidic profile overlying calcareous parent material due mainly to the relatively high rainfall of the area. The soil is well drained (red colour, no mottling) due to the soil structure despite the very high clay content and site drainage (22% slope) and the limestone below. Nutrient levels are high particularly in the lower subsoil and the surface nutrient status has been altered by management to improve nutrient availability by increasing the pH. The soil has reasonable depth for root penetration and high organic matter (8.4% OM) in the surface soil and the subsurface soil (5.9% OM). This soil is quite stable; very stable in the surface but slightly dispersive in the subsurface [Emerson 8 and 3(1)] and stable in the subsoil [Emerson 5].

Analytical data

Site CLRA9	Sample depth	pH		EC	NaCl	Ex Ca	Ex Mg	Ex K	Ex Na	Ex Al	Ex Acidity	FC –10kPa	PWP –1500kPa	KS	FS	Z	C
Horizon	cm	H₂O	CaCl₂	dS/m	%	cmol_c/kg	cmol_c/kg	cmol_c/kg	cmol_c/kg	mg/kg	cmol_c/kg	%	%	%	%	%	%
A11	0–10	7	6.6	0.29	N/R	18	3.2	0.5	0.8	N/R	N/R	45.3	29.2	3.3	22.9	41	41
A12	10–20	6.6	6.1	0.15	N/R	22	4.7	0.63	0.92	N/R	N/R	41	24.3	1.4	25.5	20	44.5
B21	30–45	5.4	4.6	0.12	N/R	16	6	0.66	1.1	N/R	N/R	52.8	31.6	1	13.6	10.5	69.5
B21	50–65	5.1	4.4	0.2	N/R	19	5.4	0.73	1.3	580	23	N/R	N/R	0.5	8.4	3.5	82.5
B/C	75–90	4.9	4.2	0.09	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R
C	100+	8.8	8.1	0.11	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R	N/R

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