Site GL159

Location: Gritjurk.

Land Unit: Dundas Trachyte

Australian Soil Classification: Ferric (& Reticulate), Eutrophic, Yellow CHROMOSOL (confidence level 1).

Geology: Cainozoic Duricrust.

General Land Unit Description: The level surface of the Dundas Tablelands predominantly consists of Brown Chromosols and to a lesser extent Yellow Chromosols with a ferric horizon (typically occurring above the clay subsoil). The soil is commonly developed over a strongly weathered mottled zone. This red and white mottling (sometimes referred to as ‘tiger mottling’) is thought to be the result of deep chemical weathering which occurred during the late Tertiary period. Red gum is the dominant vegetation found on this land unit.

Site GL159 Landscape.

Land Mapping Unit: Dundas Redgum.

Site Description:

Landform Pattern: Plain.
Position in Landscape: Flat.
Slope: 1%
Internal drainage: Imperfectly drained.


Soil Profile Morphology:

Surface Soil

A1	0-15 cm	Very dark greyish brown (10YR3/2); loam, fine sandy to sandy clay loam; weak medium blocky structure; firm consistence (dry); very few fine ferruginous nodules; pH 5.4; abrupt to clear change to:	Site GL159 Profile.
A21	15-25 cm	Brown (10YR4/3); fine sandy loam; massive; firm consistence (moist); a few fine ferruginous nodules; pH 5.8; clear change to:
A22	25-35 cm	Dark yellowish brown (10YR3/4); loam, fine sandy; massive structure; firm consistence (moist); many fine ferruginous nodules; pH 6.3; clear and wavy change to:
Subsoil
B21	35-50 cm	Brownish yellow (10YR6/6); medium heavy clay; contains a common amount of faint coarse yellowish brown (10YR5/6) mottles; weak medium polyhedral structure; firm consistence (moist), few medium ferruginous nodules and very few coarse manganiferous nodules, pH 6.9; clear and wavy change to:
B3	50-75 cm	Yellowish brown (10YR5/4); medium heavy clay; many prominent coarse dark red (2.5YR3/6) mottles; strong fine sub-angular blocky structure; firm consistence (moist); many medium ferruginous nodules and course manganiferous nodules common; pH 7.0; clear change to:
BC	75-180 cm	Tiger mottling present.

• Ferric horizons.
• Mottled subsoil.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC 1:5	Exchangeable Aluminium mg/kg	Exchangeable Acidity meq/100g	Exchangeable Cations
							Ca	Mg	K	Na
							meq/100g
A1	0-15	5.4	4.9	0.06	13	14	7.3	1.3	0.27	0.14
A21	15-25	5.8	5.2	<0.05	<10	6.2	3.8	1.4	0.18	0.20
A22	25-35	6.3	5.7	0.05	<10	6.5	4.1	2.1	0.15	0.26
B2	35-50	6.9	6.3	0.09	<10	7.4	4.5	4.4	0.24	0.59
BC	50-80	7.0	6.5	0.13

Horizon	Horizon Depth (cm)	Field Capacity pF2.5	Wilting Point pF4.2	Coarse Sand (0.2- 2.0 mm)	Fine Sand (0.02- 0.2 mm)	Silt (0.002- 0.02 mm)	Clay (<0.002 mm)
A1	0-15	28	12	22	35	10	25
A21	15-25	22	8	23	39	9	27
A22	25-35	23	10	21	38	5	35
B2	35-50	32	17	15	24	2	54
BC	50-80