EGS262

Location: Clifton Creek

Australian Soil Classification: Sodic, Dystrophic, Yellow CHROMOSOL

Map Unit: Tambo (Component 2)
Previous Site Name: EG262

General Landscape Description: Undulating to rolling low hills.
Site Description: Mid-slope, north aspect, 10 % slope
Land Use: Grazing
Native Vegetation: Shrubby dry forest
Geology: Ordovician sediments



Soil Profile Morphology:

Surface Soil

A1	0 – 5 cm	Dark brown (10YR3/2); loam; weak fine subangular blocky structure; firm dry; abrupt change to:	EG262 Profile
Subsoil
B21	5 – 20 cm	Brown (7.5YR4/2), light brown (7.5YR6/3 dry); medium clay (subplastic); moderate coarse prismaticstructure; firm dry; few (<10%) angular medium pebbles (<20 mm); clear change to:
B22*	20 – 30 cm	Brown (7.5YR4/2), few coarse reddish yellow (7.5YR6/6) mottles; light clay; moderate coarse prismatic structure; common (10-20%) angular stones (200-600 mm); clear change to:
C	30 -70 cm	Yellowish brown (10YR5/4); light clay; massive; abundant (>90%) angular soft rock.
*This horizon is discontinuous

• Shallow depth of surface soil.
• Marked increase in soil texture between the A1 and B21 horizon.
• Shallow depth to soft decomposing rock.

	pH	Sodicity	Dispersion
Surface soil	Strongly Acid	Non-Sodic	None
Subsoil (B22 horizon)	Moderately Acid	Sodic	None1
Deep subsoil (C horizon)	Slightly Alkaline	Non-Sodic	Moderate2

Horizon	Horizon Depth (cm)	pH (water)	pH CaCl2	CE dS/m	Organic Carbon %	Total Nitrogen %	Exch. Al	Exch. Acididty meq/100g	Exchangeable Cations				Coarse Sand (0.2-2.0 mm) %	Fine Sand (0.02-0.2 mm) %	Silt (0.002-0.02 mm) %	Clay (<0.002 mm) %	Field cap. % w/w	Wilt. point % w/w
									Ca	Mg	K	Na
									meq/100g
A1	0-5	5.1	4.4	5.1	8.3	0.6	140	21	3.2	2.1	0.3	0.2	21	29	20	14	36.4	17.4
B21	5-20	5.7	4.7	5.7	2.3	0.11	100	12	0.3	1.2	<0.1	0.4	18	28	7	41	26.9	10.3
B22	20-30	6.7	5.3	6.7			13	6.1	0.1	2.6	0.1	0.6	17	26	28	25	24.1	10.8
C	30-70	7.6	6.4	7.6			<5	1.7	<0.1	3.4	<0.1	0.3	19	18	38	23	21	10.3

• On the assumption the roots can extract the water in the top 25 cm of the soil, the plant available water capacity is estimated at 38 mm. The high amounts of organic matter in this surface soil have added to the soil’s ability to retain water.

• The surface soil is strongly acidic but in the subsoil it is moderately acidic. Lime is unlikely to show any economic benefit.
• Potassium is deficient and a response to potassium fertiliser is likely. This would particularly apply if the pasture was removed and baled.
• The nutrient holding capacity of the soil is low (based on the sum of the basic cations) and the depth of surface soil is shallow.

• Based on the sum of the basic cations, the subsoil has a very low nutrient holding capacity.
• The subsoil is non-sodic and only slightly dispersive. Given the presence of increasing amounts of rock down the profile, gully and tunnel erosion is unlikely.