soil orders study guide – part i these slides are to help organize in your mind: key diagnostic...
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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• Soil Orders Study Guide – Part II (on course website)
Argillic
Oxic
Calcic
Albic
Cambic
SpodicUnweathered
material
Light colored horizon
Weakly developed horizon
Acid weathering, Fe, Al oxides
Accumulation oforganic matter
Accumulation of silicate clays
High clay content
Clay skins evident
Extreme weatheringFe, Al oxides
Accumulation of inorganic salts
Carbonatesprimarily CaCO3
No
sig
nifi
can
t a
ccu
mu
latio
n
Modified from text: full version = Figure 3.5 (p. 83)See text for full descriptions
Processes Leading to Diagnostic Subsurface Layers
Missing: Andisols, Gelisols
Diagnostic Key to Soil Orders
In addition, see the text’s version: Figure 3.11 (p. 90)!
Bo
Bk ice
Bt
AAB Bh
Bs
Hi Base SatHi pHLo Base Sat
Lo pH Missing: Inceptisols, Andisols, Vertisols, Histosols
Development of soil orders
These are plausible, but not the only genetic profile descriptions that are possible for each soil order
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