Created by Sadie Blum
about 2 years ago
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Physical Properties of Soil
Why is soil texture important?
What causes the formation of soil particles?
Regarding soil size determination, give the size range of the following: sand, clay, silt.
European and American nomenclature differs…How? What is a similarity?
Describe the chart: what is the difference between the fractions of the left to the right side?
What are the two ways to determine soil texture?
What is a sieve?
O.M. can be removed by...
Soluble salts may be removed by ____ (they inhibit dispersion)
Carbonates may be removed by...
____ _____ is used to break up aggregates (sodium hexametaphosphate)
Who made up Stokes Law?
In the analysis of sedimentation, Stokes Law is used. What is stokes law?
What is the finger test?
As particles become smaller, the deviation from perfect sphere becomes more critical. deviation from spherical shape increases .....
Access to surfaces on clay particles may be impeded by:
What is important to note about packing of particles?
What is pore space?
What is a matrix?
What is 1 pointing to?
What is 2 pointing at?
what is a contact point?
the more contact points, the ____ the soil strength.
What is bulk density?
a soil with a mass of 50 grams after being oven-dried has a volume of 30 cm3 What is bulk density?
What is particle density?
What are some differences between bulk density and particle density?
What is soil porosity?
Average soil has porosity of
Pores are filled with....
What is soil permeability?
Clayey soils can have ____ total porosity than sand and still be ____ permeable than sand since the pores are small.
Ideally, ____ particles should have highest density
Most soils tend to increase in surface with time. What does this result?
How does human activity affect the soil?
Water typically adheres to clay particles due to
amount of water adhering will impact _____/____ of soil matrix
Flocculated vs. dispersed particles
Why is flocculation important?
Most clay particles have a ____ electrical charge. Like charges repel, so clay particles repel one another.
_____ can make clay particles stick together (flocculate).
What is an example of a poor flocculator?
What are examples of good flocculators?
Explain Flocculating Power of Cations
What does SAR stand for?
explain electrical conductivity
Soil particles will flocculate if concentrations of (Ca2+ + Mg2+) are ____ relative to concentration of Na+
_____ _______ (dispersion and flocculation) depends on the balance (SAR) between (Ca2+ and Mg2+) and Na+ as well as the amount of soluble salts (EC) in the soil.
Soil particles will disperse if concentrations of (Ca2+ + Mg2+) are _____ relative to concentration of Na+