Soils I. Importance of soil II. Soil structure A. Composition B. Soil formation III. Soil types A....
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Transcript of Soils I. Importance of soil II. Soil structure A. Composition B. Soil formation III. Soil types A....
SoilsI. Importance of soilII. Soil structure
A. CompositionB. Soil formation
III. Soil typesA. Soil typesB. Soil particles:
1. Sand and silt2. Clay3. humus
IV. Soils and ecosystems
II. Soil structureA. Composition
1. Inorganic matter
Rocks and minerals Air and water
2. Organic matter
LivingDead
dynamic equilibrium
air
water50%
B. Soil formation
Big chunks into little chunks
Decomposition
Rocks and minerals:
weathering
End point:
Organic matter end point:humus
sand, silt, and clay
(recalcitrant)
horizons
III. Soil typesA. Soil typesB. Soil particles:
1. Sand and silt2. Clay3. humus
Particle Size(mm)
Shape
Feel Charge
Sand
Silt
Clay
Humus
2 – 0.2
.2 - .002
< .002varies
chunky
chunky
plates
amorphous
gritty
floury
sticky
spongy
inert
inert
ert (-)
ert (+/-)
IV. Soils and ecosystems
Acidic, organic
Deep organic
Very acidic, anaerobic
Shallow, low organic
Sandy, low organic
Loess
Palouse