Aridic Haploxerert

Ap

Bss2

BC

C

Bss1

List key properties• Order, Suborder, Great

group, Subgroup

Which diagnostic horizons and key criteria did you identify?• Epipedon, Diagnostic

subsurface horizons, Other characteristics

Customize soil properties that demonstrate the diagnostic criteria

Soil Forming Processes

Aridic Haploxerert

Ap

Bss2

BC

C

Bss1

List key properties

Vertisols: (p. 33)• High clay content (> 30% in Ap and to

50 cm) • Within 100 cm: slickensides/wedge-

shaped peds 25 cm thick layer • Cracks that open and close

periodically.

Xerert: (p. 287)• Frigid, mesic, or thermic temp. regime• Moisture regime inferred from

temporal pattern of cracking (because control section concept does not work in these cracking soils).Open > 60 days consecutive in

summerClosed > 60 consecutive in winter.

Haploxerert: (p. 297)• Minimum horizon development.• No duripan, calcic, or petrocalcic

horizon within 100 cm of mineral soil surface.

Aridic Haploxerert: (p. 298)• No bedrock or salts.• Cracks: Open > 180 days

consecutive.

Aridic Haploxerert

Ap

Bss2

BC

C

Bss1

Diagnostic horizons and features

•Epipedon – none required, but can be mollic or ochric.

•Subsurface – none required, but cambic and calcic horizons are common.

•Other – Slickensides and/or wedge-shaped peds produced by shrink-swell processes.

Aridic Haploxerert

Ap

Bss2

BC

C

Bss1

Soil forming processes dominated by:•Shrink-swell churning, which limits the expression of horizons

•Low leaching, high base environment favors production and accumulation of smectite minerals such as montmorillonite

Additions•Organic debris to surface and into cracks.

Removals•Minimal due to low leaching (climate and low Ksat).

Transfers•Cracks & churning redistribute material from surface.

Transformations•Production of smectite minerals?

Wedge-shaped peds

Slickensides

Aridic Haploxerert

Ap

Bss2

BC

C

Bss1

List key properties• Order, Suborder, Great group, Subgroup

Which diagnostic horizons and key criteria did you identify?• Epipedon, Diagnostic subsurface horizons, Other characteristics

Customize soil properties that demonstrate the diagnostic criteria

Soil Forming Processes

Key Criteria

Vertisols: ( Key to Soil Orders on p. 33)• High clay content (> 30% in upper 18 cm or Ap horizon and to

50 cm) • Within 100 cm: slickensides or wedge-shaped peds in a layer

25 cm or more thick • Cracks that open and close periodically

Xerert: ( Key to Suborders of Vertisols on p. 287)• Frigid, mesic, or thermic soil temperature regime• Moisture regime inferred from temporal pattern of cracking

(because control section concept does not work in these cracking soils)

Open > 60 days consecutive in summer Closed > 60 consecutive in winter

Haploxerert: ( Key to Great Groups on p. 297)• Minimum horizon development• No duripan, calcic, or petrocalcic horizon within 100 cm of

mineral soil surface

Aridic Haploxerert: ( Key to Subgroups on p. 298)• No hard bedrock, high salinity, or high sodium• Cracks: Open > 180 days consecutive

Diagnostic horizons and features• Epipedon – none required, but could be mollic or ochric• Subsurface – none required, but cambic and calcic are

common• Slickensides and/or wedge-shaped peds produced by

shrink-swell processes

Soil forming processes dominated by:• Shrink-swell churning, which limits the expression of horizons• Low leaching, high base environment favors production and

accumulation of smectite minerals such as montmorillonite

Additions• Organic debris to surface and into cracks

Removals• Minimal due to low leaching (climate and low Ksat)

Transfers• cracks & churning redistribute material from surface

Transformations• production of smectite minerals?

TYPIC CALCIUDOLLS

Ap

A

BA

Bk

C

BC

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Which diagnostic horizons and key criteria did you identify?• Epipedon, Diagnostic subsurface horizons, Other characteristics

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Soil Forming Processes

TYPIC HAPLOCRYODS

A

BC

Bs

Bhs

E

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Which diagnostic horizons and key criteria did you identify?• Epipedon, Diagnostic subsurface horizons, Other characteristics

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Soil Forming Processes

Oxyaquic Udifluvent List key properties• Order, Suborder, Great group, Subgroup

Which diagnostic horizons and key criteria did you identify?• Epipedon, Diagnostic subsurface horizons, Other characteristics

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Soil Forming Processes

^Au

^ABu

2^Cu

3^C

4Cg

Calcic Haploxerept

A

BA

Bk1

2Bk2

2C

Bw

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Soil Forming Processes

TYPIC KANDIUDULTS

A1

A2

E

Bw

Bt1

Bt2

Bt3

Bt4

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Which diagnostic horizons and key criteria did you identify?• Epipedon, Diagnostic subsurface horizons, Other characteristics

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Soil Forming Processes