LSWW25

Location: Dergholm

Australian Soil Classification: Bleached, ?, Red CHROMOSOL (confidence level 3)
General Landscape Description: Rise
Site Description: Hillslope
Land Unit: Nareen Granite
Geology: Cambrian granite

General Land Unit Description: Granite material is mainly found dissecting the Glenelg River and on the low hills and rises around Nareen. The dominant soil type is a Mottled Brown Chromosol (GL161) although this site represents variant that occurs on the better drained slopes. Due to the steep slopes, the lower slopes tend to have colluvial material deposited on top. This is the minor soil type representing the Nareen Granites land unit, occurring mainly on the dissected slopes to the Glenelg River.






Sheet and gully erosion on granitic slopes





Soil Profile Morphology:

Surface Soil			Bleached, Red Chromosol
A1	0-10	Brown (7.5YR4/2); sandy loam; moderate fine subangular blocky structure; weak consistence when dry; many (30%) granitic fragments; pH 5.7; clear to abrupt boundary to:
A2	10-140	Brown (7.5YR4/2); sandy clay loam; conspicuously bleached; weak to massive (structureless); weak consistence when dry; many (40–50%) granitic fragments; pH 5.7.
Subsoil
B2	140-150	Dusky red (2.5YR4/3); medium heavy clay; polyhedral structure; smooth ped-fabric; common granitic fragments (15%); pH 5.6.
C	150-170	Weathered granitic bedrock.

• Strong texture contrast between topsoil and subsoil
• Deep Bleached A2 horizon
• Acidic throughout, moderate nutrient holding capacity in subsoil likely. Limited nutrient holding capacity in surface and subsurface soil
• Thin strongly structured subsoil (Small amount of clay formation from the granite bedrock)
• Hillslope well drained site drainage. Depth to parent material may vary (rock outcrop, large boulders)

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC dS/m	Coarse Sand (0.2-2.0 mm) %	Fine Sand (0.02-0.2 mm) %	Silt (0.002-0.02 mm) %	Clay (<0.002 mm) %	Wilting Point % w/w
A1	0–10	5.7	4.7	<0.05	40.7	33.6	10.5	10.5	6.6
A2	10–140	5.7	4.5	<0.05
B2	140–150	5.6	4.3	<0.05	26	18.3	6.5	44.5	18.3
C	150–170+