OTR414

Location: Johanna

Australian Soil Classification: Melacic, Mesotrophic, Black DERMOSOL

General Landscape Description: Hills
Site Description: Upper Slope - Ridge Slope: 4% Aspect: South-East
Native Vegetation: E. golbulus and E. obliqua.
Geology: Kl: Cretaceous Sediments; Felspathic Sandstone (Eumeralla Formation)

OTR414 landscape

Soil Profile Morphology:

Surface Soil

A1	0-13 cm	Very dark brown (10YR2/2); loam; moderate subangular blocky structure; clear boundary to:
A3	13-45 cm	Very dark brown (10YR2/2); clay loam; moderate to strong angular blocky structure; diffuse boundary to:
Subsoil
B2	45-90 cm	Very dark greyish brown (10YR3/2); heavy clay; moderate coarse (40 mm) angular blocky structure; diffuse boundary to:
C	90 + cm	Yellowish brown (10YR5/8) and grey (10YR6/1) mottles; medium clay; apedal massive structure.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity
Surface (A1 horizon)	Strongly Acid	Medium	Non-Sodic
Subsoil (B21 horizon)	Strongly Acid	Very Low	Non-Sodic
Deeper Subsoil (at 90 cm)	Strongly Acid	Very Low	Non-Sodic

This profile is strongly acid.

The salinity rating in the surface is medium. The salinity rating in the subsoil is very low.

This profile is non-sodic

The clay content in the surface is low. Clay content increases with depth.

Horizon	Horizon Depth (cm)	pH (water)	EC dS/m	Cl %	Organic Carbon %	Total N %	P ppm	K ppm	Free Fe %	Exchangeable Cations				Total Bases cmolc/kg	Ex Ac cmolc/kg	CEC cmolc/kg
										Ca	Mg	K	Na
										cmolc/kg
A1	0-8	5.1	0.12	0.011	5.0	0.38	0.025	180	2.8	4.8	2.9	0.4	0.2	8.3	13.5	22.2
A1	8-13	5.2	0.09	0.009	3.4	0.20	0.014	140	3.2	3.3	2.1	0.4	0.2	6.0	14.2	20.2
A3	13-30	5.3	0.06	0.004	1.3	0.080	0.011	140	5.2	1.7	4.6	0.4	0.2	6.9	10.6	17.4
B2	30-45	5.3	0.06	0.004	0.9	0.072	0.012	180	6.8	1.6	3.9	0.5	0.2	6.2	12.7	19.0
C	90-120	5.1	0.07	0.004	0.4	0.032	0.014	200	9.4	0.6	6.6	0.6	0.3	8.1	22.4	30.7

Horizon	Horizon Depth (cm)	Gravel %	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	0-8	tr.	14	40	23	18
A1	8-13	4	14	39	22	21
A3	13-30	2	11	35	18	35
B2	30-45	tr.	7	29	14	49
C	90-120	tr.	1	18	11	68

Management Considerations:
The gradational (earths) or medium textured soils (loams) nature of the soil profiles are often preferred due to their low physical limitations but remains dependent on any chemical or depth restrictions. The friable nature of the soil occurs where there is a build-up of organic matter.

Acidic soil horizons reflects the high rainfall and can restrict the uptake of certain nutrients as well as intolerance for some plant species (due in part to the increasing mobilisation of aluminium and manganese).

Deficiencies of calcium, potassium and molybdenum are likely.

Profile Described By: Frank Gibbons, 14th January 1965.

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