MM227

Site code	MM227
Location	Camperdown (Boundary Road), Camperdown district, south-west Victoria
Landform	Undulating basalt hills
Geology	Quaternary Newer Volcanics: tuff rings, pyroclastic base surge and fall deposits consisting of ash, lapilli, scoria; well bedded and sorted, moderately consolidated
Element	Mid slope

Profile morphology

Horizon	Depth (cm)	Description
A1	0–30	Black (10YR2/1); clay loam; moderate fine blocky structure; weak consistence (dry); clear boundary to:
A2	30–45	Sporadically bleached, light grey (10YR7/2 dry); clay loam; very many fine segregations; sharp boundary to:
B21	45–65	Very dark greyish brown (10YR3/2); medium clay; strong medium blocky structure; very firm consistence (moist); very many fine segregations; gradual boundary to:
B22	65–100	Brown (10YR4/3) with brown (10YR5/8) mottles; medium clay; strong medium blocky structure; firm consistence (moist); boundary to:
B23	100+	Dark greyish brown (10YR4/2) with brown (10YR5/8) mottles; medium clay; apedal massive structure; firm consistence (moist).

ASC: Bleached-Ferric; Eutrophic; Black Chromosol

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

Site MM227	Sample depth	pH		EC	NaCl	Ex Ca	Ex Mg	Ex K	Ex Na	Ex Al	Ex acidity
Horizon	cm	H₂O	CaCl₂	dS/m	%	cmol_c/kg	cmol_c/kg	cmol_c/kg	cmol_c/kg	mg/kg	cmol_c/kg
A1	0–30	6.3	N/R	0.1	N/R	5.6	5.6	0.3	0.6	N/R	13.2
A2	30–45	6.3	N/R	0.06	N/R	2.5	2.5	0.2	0.5	N/R	12.2
B21	45–65	7.1	N/R	0.21	0.02	5.7	5.7	0.3	1.4	N/R	11.1
B22	65–100	7.2	N/R	0.15	N/R	N/R	N/R	N/R	N/R	N/R	11.2
B23	100+	7.1	N/R	0.16	0.04	8	8	0.2	3.3	N/R	12.6

Site MM227	Sample depth	FC (-10kPa)	PWP (-1500kPa)	KS	FS	Z	C	Org C	Bulk density
Horizon	cm	%	%	%	%	%	%	%	t m^-3
A1	0–30	35.3	23.7	4	43	22	23	4.4	1.04
A2	30–45	22.2	15.5	21	37	20	18	N/R	N/R
B21	45–65	39.3	33.1	17	19	9	55	N/R	1.39
B22	65–100	N/R	N/R	3	16	10	70	N/R	N/R
B23	100+	N/R	N/R	4	12	10	73	N/R	N/R

Management considerations
Strong texture contrast between the surface soil and the subsoil is a very important soil feature and may impact upon subsoil permeability. Conspicuously bleached A2 horizons containing many fine segregations are key features of this profile. Sodic and mottled subsoils are other prominent features of this soil type.

The application of gypsum would be suitable for soil structure and improved permeability, while increasing organic matter and maintaining vegetative cover is important to help improve the soil structure. Penetration by deep-rooted crops is also useful as is minimum tillage practices which avoids bringing the sodic material to the surface.

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