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Soil Orders Study Guide – Part I. These slides are to help organize in your mind: Key diagnostic features for each Soil Order Their developmental progression Diagnostic surface & subsurface layers See also – for the individual orders: the text’s description and plates

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soil orders study guide part i
Soil Orders Study Guide – Part I

These slides are to help organize in your mind:

  • Key diagnostic features for each Soil Order
  • Their developmental progression
  • Diagnostic surface & subsurface layers

See also – for the individual orders:

  • the text’s description and plates
  • Soil Orders Study Guide – Part II (on course website)
slide2

Soil Orders: Key Formative Factors

  • Note their:
  • Relative order
  • Key formation factors
slide4

Processes Leading to Diagnostic Subsurface Layers

Albic

Light colored horizon

Argillic

Weakly

developed horizon

Cambic

High clay content

Clay skins evident

No significant accumulation

silicate clays

Accumulation of

Extreme weathering

Fe, Al oxides

Oxic

Unweatheredmaterial

Accumulation of

organic matter

Acid weathering,

Fe, Al oxides

Spodic

Accumulation of inorganic salts

Carbonates

primarily CaCO3

Calcic

Modified from text: full version = Figure 3.5 (p. 83)

See text for full descriptions

diagnostic key to soil orders
Diagnostic Key to Soil Orders

In addition, see the text’s version: Figure 3.11 (p. 90)!

Missing: Andisols, Gelisols

development of soil orders1

Bk

ice

Bo

Development of soil orders

A

AB

Bh Bs

Bt

Hi Base Sat

Hi pH

Lo Base Sat

Lo pH

Missing: Inceptisols, Andisols, Vertisols, Histosols

These are plausible, but not the only genetic profile descriptions that are possible for each soil order