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36 terms

Soil Science Quiz 2

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Gelisol
"el" soils with permafrost
Entisol
"ent" young soils A and C
Inceptisols
"ept" inception of Bw
Andisol
"and" volcanic soils
Histosol
"ist" organic soils
Aridisol
"id" soils found in arid envrionments
Mollisol
"oll" productive ag soil, A
Vertisol
"ert" high in shrink swell clays
Alfisol
"alf" mature, developed Bt
Spodosol
"od" coniferous forest soils, low pH
Ultisol
"ult" very mature, weather soil
Oxisol
"ox" extremely weather, tropical soils
aqu
"wet"
arg
"clay accumulation"
bor
"cool"
calc
"calcium carbonate"
cry
"very cold"
gyps
"gypsum"
hum
"accumulation of humus"
orth
"common"
psamm
"sandt"
sal
"high in soluable salts"
torr
"hot and dry"
ud
"humid"
ust
"semi arid"
xer
"mediterranean climate"
Texture
proportions of individual sand, silt, clay particles in soil.
Modified Triangle
>40%=Clay Top
>27%=Clay Loam Middle
>difference between % sand and silt, is >10%
Bulk Density
Bd=Mass of oven dry soil/ Total volume of soil
Particle Density
Pd= Mass of oven dry soil/Volcume of soil solids
% Pore Space (porosity)
=100% - Bd/Pd * 100
Factors that affect Bd and Pd
Bd Pd
Compaction: Up Same
Tillage: Down Same
Organic Matter: Down Down
Infiltration
water movement into soil at surface
Percolation
water movement through soil
Aerationn
gas movement in the soil
Permeability
gas, liquid, tree roots, combined