COF01

Rolling low hills near Johanna		Site Code	COF01a	Acidic, Eutrophic, Grey DERMOSOL (Clayey)
		Location	Johanna
		Landform	Rolling low hills
		Geology	Neogene Hanson Plain Sand: fluvial gravel, sand , silt
		Element	Upper slopes
		Slope	26%
		Aspect	south-east
Horizon	Depth (cm)	Description
A1	0-20	Dark brown (10YR3/3); light medium clay; strong fine polyhedral, parting to strong fine granular structure; weak consistence (moderately moist); pH 5.4; many medium roots; gradual and wavy boundary to:
B21	40-80	Dark greyish brown (10YR4/2) with common medium distinct yellowish brown (10YR5/8) mottles; medium heavy clay; moderate coarse polyhedral, parting to weak fine polyhedral structure; firm consistence (moderately moist); pH 5.3; many medium roots; gradual and wavy boundary to:
B22	80-110	Dark greyish brown (10YR4/2) with many medium distinct yellowish brown (10YR5/8) and very pale brown (10YR7/3) mottles; light medium clay; moderate coarse polyhedral, parting to moderate medium polyhedral structure; firm consistence (moderately moist); pH 5.1; many medium roots; clear and wavy boundary to:
B23	110-140	Light grey (10YR7/2) with many very coarse distinct strong brown (7.5YR5/8) mottles; light clay; massive structure; very firm consistence (moderately moist); pH 5.0; few very fine roots:
	140-200	Similar to above.
	200-800	Similar to above but harder, old remnant roots observed 2.5 - 3.0 m; no live roots observed; live roots observed at 2 m; notice impeding layer; roots don't like it.













Management considerations
This soil site is acid throughout the soil profile and has high levels of exchangeable aluminium in the subsoil. Acidic subsoils generally occur on acidic parent material or where there has been sufficient leaching of the soil. These subsoils affect nutrient availability, creating a nutrient imbalance and the potential for aluminium and manganese toxicity. The application of lime is the main method of increasing the pH, reducing toxic levels of nutrients to plants while increasing the availability of nutrients such as calcium, potassium and molybdenum. Where the acidity is deep, acid tolerant plants are a practical option.

Analytical data

Site COF01	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	%	%	%	%	%	%
A1	0-20	5.4	4.6	0.07	N/R	5.8	4.3	0.99	0.21	82	14	37.3	17.3	2.1	19.8	32.5	40.0
B21	40-80	5.3	4.2	0.06	N/R	5.6	7.2	1.3	0.27	300	14	39.7	21.5	0.5	12.5	28.0	57.0
B22	80-110	5.1	4.1	0.07	N/R	3.0	7.0	0.94	0.29	990	19	43.9	27.2	0.8	14.2	35.0	50.5
B23	110-140	5.0	4.1	<0.05	N/R	1.4	5.2	0.50	0.22	820	15	35.6	11.8	4.2	48.2	25.5	19.5

Page top