,O Hor. - ANSWERS- formed by accumulation of leaf litter
- important C storage
- virtually 100% OM
- not all soils have
- (none in Lubbock)
- forests or grasslands
A Hor. - ANSWERS"topsoil"
- more OM and darker than subsoil
- largely mineral soil
- weak structure
- many plant roots
E Hor. - ANSWERS"alluvial"
- max leaching of clays and iron oxides occurs leaving resistant minerals (quartz)
- known as elevation
- lighter in color
- directly below A hor.
- take time to form
- often destroyed by cultivation
B Hor. - ANSWERS"illuviation"
- if lies below plow layer = "subsoil"
, - accumulation of:
- clay,
- iron,
- aluminum oxides
- and/or calcium carbonates
stronger structural devel. with substantial quantity of roots
- redder hue and brighter chroma than A hor.
- take time to form
C Hor. - ANSWERS* underlying, unconsolidated materials below solum
* sometimes serves as PM for solum
* largely unaffected by wea or biol activity
* weak to no structure
* few roots
* almost no pedogenic devel.
R Layer/Hor. - ANSWERSbedrock with little evidence of weathering
EX:
limestone,
granite,
basalt
typical soil horinization - ANSWERSABC
or
ABR
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