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Flashcards in Soil Horizons Deck (20):
1

surface horizon with lots of organic material

O horizon

2

horizon nearest the surface, has lots of mineral particles but is darker due to organic matter

A horizon

3

the bleacher horizon where things are being leached out

E horizon

4

underlying layers that have accumulated materials washed down from above or formed from weathering with little organic matter

B horizon

5

the least weathered soils horizon

C horizon

6

weakly developed B horizon, evidence of color and or structure development w/o clay accumulation

Bw - Cambic

7

illuvial accumulation of silicate clays, clay films on peds, in pores, called clay skins or cutan

Bt - Argillic

8

illuvial accumulation of humus and sesquioxides in coarse textured soils and cool climates

Bh, Bs, Bhs - Spodic

9

weakly cemented, dense horizon, > 50% of upland soils in the loess region, usually loamy textured

Bx, Cx - Fragipan

10

highly weathered, accumulation of low activity clays, Fe&Al oxides, very low & BS

Bo - Oxic

11

A horizon that has been plowed

Ap

12

dominent grey color (red splotchy)

Bg

13

strong gleying (mottles caused by iron)

g

14

illuvial accumulation of OM (caused by rain water flowing from one layer to another)

h

15

accumulation of Fe and Al oxides

o

16

plow layer

p

17

illuvial (caused by rain water flowing from one layer to another) accumulation of sesquioxides (free iron oxides)

s

18

silicate clay accumulation

t

19

distinctive color without clay

w

20

fragipan

x