IT6

Site: IT6	Land Unit: Glenelg River Granites
*Aust. Soil Class.:* Basic, Petroferric, Orthic TENOSOL (confidence level 1)

General Land Unit Description:

This site is the major soil type representing the Cambrian granite that is dissected by the Glenelg River and its tributaries. These soils are uniform in nature with relatively little clay throughout the profile. A common characteristic of these soils is a discontinuous cemented ironstone pan (petroferric horizon). Although the pan is discontinuous throughout this landscape, it does impact on the hydrological characteristics of the soil, decreasing the water holding capacity of the soil as well as acting as a barrier to plant roots. On the gentler slopes, there can be more soil development, with a common soil being Sodosols (GL160, GL122). The significant landscape feature of this land unit is the short steep slopes leading to the major drainage lines. The slope of the land, combined with the petroferric pan, are the major limitations for agriculture.

Site Description:

Geology: Cambrian granite	Landform pattern: V-shaped rolling valleys
Position in landscape: Lower slope	Internal drainage: Moderately well drained

Soil Profile Morphology

A1	0-15 cm	Brown (7.5YR4/4) loamy sand, loose structure, ferruginous nodules are common, pH 6.5. Transition to:
	Subsoil
B2	15-45 cm	Dark brown (7.5YR3/4) clayey sand, loose structure, many ferruginous nodules forming a petroferric pan, pH 6.5.

Key profile features:

Petroferric pan

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