Reference soil Australia 25: Acrisol

AU025

Acrisols occur dominantly in the wetter parts of the tropics and subtropics and the warm temperate regions in relatively young landscapes.

Characteristics

Soils having an argic horizon (a subsurface horizon with distinct higher clay content than the overlying horizon), which has a cation exchange capacity of less than 24 cmolc per kg in some part, either starting within 100 cm from the soil surface, or within 200 cm from the soil surface if the argic horizon is overlain by loamy sand or coarser textures throughout. They have a base saturation (total amount of Ca, Mg, K and Na with respect to the cation exchange capacity) of less than 50 percent in the major part between 25 and 100 cm from the soil surface

Distribution of Acrisols (rough estimation supplied by soilgrids)

Reference soil AU025: Acrisols

Classification

WRB 1998
Acrisol
FAO-UNESCO-ISRIC 1988		FAO-UNESCO-ISRIC 1974
Stagni-Humic Acrisol		Gleyic Acrisol

Local classification:

HAS: Grey-brown Podzolic Soil, Springton light sandy loam; FK: Dy3.22

Other classification

USDA-SCS (1975)

Haplustult ustic sandy over clayey micaceous thermic

Profile description

Ah1 0-6 cm	dark greyish brown (10YR 4/2, dry) very dark greyish brown (10YR 3/2, moist)sandy loam,weak fine and medium crumb,soft very friable non sticky non plastic,many very fine pores,many very fine few fine and medium roots,non calcareous 10% HCl,clear smooth boundary to,
Ah2 6-22 cm	dark greyish brown (10YR 4/2, dry) very dark greyish brown (10YR 3/2, moist)sandy loam,weak fine and medium platy,slightly hard very friable non sticky non plastic,many very fine pores and few pores,many very fine roots,non calcareous 10% HCl,gradual smooth boundary to,
Ah3 22-37 cm	(10YR 4.5/2, dry) (10YR 3.5/2, moist)sandy loam,strong fine and medium platy,slightly hard very friable non sticky non plastic,few very fine pores,few very fine roots,non calcareous 10% HCl,gradual smooth boundary to,
ABg 37-50 cm	(10YR 4.5/2, dry) (10YR 3.5/2, moist)sandy loam,weak fine and medium platy,slightly hard very friable non sticky non plastic,common fine distinct clear mottles (7.5YR 6/6) and common fine faint mottles (10YR 4/2),many very fine pores,few very fine roots,non calcareous 10% HCl,abrupt wavy boundary to,
Btg 50-74 cm	weak red (2.5YR 4/2, dry) dusky red (2.5YR 3/2, moist)clay,moderate very coarse angular blocky parting to moderate medium angular blocky,hard firm sticky plastic,many heterogeneous distinct clear mottles,many very fine pores,few very fine roots,very few coarse gravel weathered micaschist fragments,non calcareous 10% HCl,
BCg 74-84 cm	clayweak very coarse angular blocky,firm sticky,many heterogeneous distinct clear mottles,many very fine pores,few very fine roots,common medium and coarse gravel weathered micaschist fragments,non calcareous 10% HCl,

Kind 1 (parent material) ; Parker (eds), 1984	schist
Mode of accumulation or deposition of parent material	residual material
Remarks on Parent Materials	Paleozoic micaschist of the Kanmantoo Group
Soil Depth	104cm
Texture of parent material	clayey
Texture of parent material (second entry)	sandy
Weathering Resistance	moderate
General characterization of the status of weathering of solid rock	partially or moderately

Land use or vegetation in the immediate vicinity of the site	shrubland, grazed
Remarks on Land Use / Vegetation	VEGETATION: savannah woodland of Eucalyptus camaldulensis (red gum) and Themeda australis (kangaroo grass). LAND USE: sheep grazing of subterranean clover, annual grasses and cape weed.
Major vegetation type; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	semi-deciduous woodland

Altitude	396m
Physiographic Unit	moderate slope
Physiographic position of the site	slope
Regional landform; McDonald, R.C., Isbell, R.F. et all, 1984; Australian soil and land survey Field Handbook, Inkata Press, Melbourne.	low hill
Form of the slope surrounding the site	concave
Topography; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	undulating

Drainage class ; FAO (2006) - Guidelines for soil description	moderately well
Dry From - To	0-104cm
Flooding frequency (FAO, 1986)	never
Kind of ground water table (USDA, 1979)	no groundwater table observed
Estimated permeability (class) of least permeable part of the profile	moderate
Estimated run off (class)	medium

Evidence of alkali ; Soil Survey Manual USDA, 1951	non-alkaline
Surface cracking	no cracks observed
Slaking of aggregates by tillage, rainfall or frost (USDA/SCS, 1979)	no surface slaking/crusting observed
Rock outcrop class (FAO (2006) - Guidelines for soil description)	none
Evidence of salt; Soil Survey Manual USDA, 1951	non-saline
Surface stoniness class (FAO (2006) - Guidelines for soil description)	none

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Reference soil Australia 25: Acrisol

Characteristics

Reference soil AU025: Acrisols

Classification