Volcanic Ash
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wind deposited, silt and sand particles from the eruption of volcanoes
-Amorphous
-weathers to give low bulk density soils with high phosphorous fixation
Oxides
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, -Hematite, Fe2O3
-geothite, FeOOH or Fe(OH)3
-gibbsite, Al(OH)3
all very insoluble
Atmosphere
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from top soil on up
Stickiness
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described at the moisture content at wich the soil adheres to fingers and
thumb
Weathering
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all physical and chemical changes produced in rocks and minerals at or
near the Earth's surface
Minerals in Siliceous Rocks
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-quartz
-K-feldspars
-dark minerals like mica, amiphbole, pyroxene
ET efficiency
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dry matter yield per unit of water lost to ET
Compaction
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no effect on texture
no effect on PD
increases BD
decreases porosity
destroys soil structure
Solum
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horizons A and B
, Sulfates
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-Gypsum, CaSO4x2H2O
-relatively soluble
Particle Density (PD)
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refers only to soil solids
PD = particle mass/ particle volume
measures in g/cc or Mg/m^3
common range is 2.4-2,9 g/cc
quartz is 2.65 g/cc
organic matter is less than 1 g/cc
Percolation and Leeching
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percolation loss is influenced by
-amount and distribution of precipitation
-runoff
-evaporation
-nature of vegetation (annual vs perennial, etc)
-character of soil (especially infiltration rate and water holding capacity)
Percolating waters carriers solutes to ground water
-nitrates
Give this one a try later!
wind deposited, silt and sand particles from the eruption of volcanoes
-Amorphous
-weathers to give low bulk density soils with high phosphorous fixation
Oxides
Give this one a try later!
, -Hematite, Fe2O3
-geothite, FeOOH or Fe(OH)3
-gibbsite, Al(OH)3
all very insoluble
Atmosphere
Give this one a try later!
from top soil on up
Stickiness
Give this one a try later!
described at the moisture content at wich the soil adheres to fingers and
thumb
Weathering
Give this one a try later!
all physical and chemical changes produced in rocks and minerals at or
near the Earth's surface
Minerals in Siliceous Rocks
,Give this one a try later!
-quartz
-K-feldspars
-dark minerals like mica, amiphbole, pyroxene
ET efficiency
Give this one a try later!
dry matter yield per unit of water lost to ET
Compaction
Give this one a try later!
no effect on texture
no effect on PD
increases BD
decreases porosity
destroys soil structure
Solum
Give this one a try later!
horizons A and B
, Sulfates
Give this one a try later!
-Gypsum, CaSO4x2H2O
-relatively soluble
Particle Density (PD)
Give this one a try later!
refers only to soil solids
PD = particle mass/ particle volume
measures in g/cc or Mg/m^3
common range is 2.4-2,9 g/cc
quartz is 2.65 g/cc
organic matter is less than 1 g/cc
Percolation and Leeching
Give this one a try later!
percolation loss is influenced by
-amount and distribution of precipitation
-runoff
-evaporation
-nature of vegetation (annual vs perennial, etc)
-character of soil (especially infiltration rate and water holding capacity)
Percolating waters carriers solutes to ground water
-nitrates
