Reference soil Australia 19: Acrisol

AU019

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 AU019: Acrisols

Classification

WRB 1998

Ferri-Humic- Acrisol (Haplic)

FAO-UNESCO-ISRIC 1988

FAO-UNESCO-ISRIC 1974

Humic Acrisol

Local classification:	HAS: Yellow Earth; FK: Gn2.81

Other classification

USDA-SCS (1975)

Palehumult udic fine-loamy siliceous thermic

More images

Profile description

Ah 0-10 cm	dark greyish brown (10YR 4/2, dry) very dark greyish brown (10YR 3/2, moist)sandy loam,moderate fine angular blocky,very friable,many fine pores and few pores,many very fine roots,frequent pedotubules,non calcareous 10% HCl,clear boundary to,
10-23 cm	(2.5YR 5.5/5, dry) (2.5YR 5/5, moist)sandy loam,weak coarse angular blocky,very friable,many fine distinct clear mottles (10YR 3/2),many fine pores and few pores,common very fine roots,few ferruginous concretions,few fine gravel quartz fragments,frequent pedotubules,non calcareous 10% HCl,gradual boundary to,
Bt 23-46 cm	reddish yellow (7.5YR 6/6, dry) strong brown (7.5YR 5/6, moist)loam,porous massive,very friable,few fine distinct clear mottles (10YR 3/2),many fine pores and few pores,common very fine roots,few ferruginous concretions,few fine gravel quartz fragments,frequent pedotubules,non calcareous 10% HCl,diffuse boundary to,
Btg 46-98 cm	strong brown (7.5YR 5/6, moist)clay loam,porous massive,very friable,many coarse prominent clear mottles (2.5YR 4/8),many fine pores,few very fine roots,frequent pedotubules,non calcareous 10% HCl,

Kind 1 (parent material) ; Parker (eds), 1984	mixed lithology and composition
Mode of accumulation or deposition of parent material	fluvial
Remarks on Parent Materials	sandy alluvium over mudstone with sedimentary clay bands and gravels underneath (Thompson, July 1983)
Soil Depth	98cm
Texture of parent material (second entry)	loamy
General characterization of the status of weathering of solid rock	partially or moderately

Major crops	crops (unspecified)
Land improvements ; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	land clearing
Land use or vegetation in the immediate vicinity of the site	high level arable farming
Remarks on Land Use / Vegetation	VEGETATION: native vegetation: grassy forest of Eucalyptus acmenioides (stringybark), E. intermedia (bloodwood), E. propinqua (gum), E. crebra (ironbark), Tristania conferta (brush box), with a light grass cover of Themeda sp., Imperata sp., Digitaria sp. LAND USE: land has been cleared for experimental farm
Status of vegetation; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	cut over
Major vegetation type; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	extremely xeromorphic forest

Altitude	59m
Physiographic Unit	low hilly terrain
Physiographic position of the site	middle slope
Regional landform; McDonald, R.C., Isbell, R.F. et all, 1984; Australian soil and land survey Field Handbook, Inkata Press, Melbourne.	low hill
Slope	3%
Form of the slope surrounding the site	convex
Topography; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	undulating

Drainage class ; FAO (2006) - Guidelines for soil description	moderately well
Dry From - To	0-46cm
Kind of ground water table (USDA, 1979)	no groundwater table observed
Moist From - To	46-98cm
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 19: Acrisol

Characteristics

Reference soil AU019: Acrisols

Classification