Lab 2 Flashcards
What is the texture and size of sand?
It is gritty feeling and single grained. 0.05-2mm in d
What is the texture and size of silt?
It is smooth and floury, 0.05-0.002mm in d
What is the texture and size of clay?
It will form a long ribbon, <0.002mm in d
What is the basis of Stoke’s Law?
The larger a particle is the faster it will fall.
What are the four types of soil structures?
granular, platy, blocky, and prism
What soil structure is most prevalent in a B horizon?
blocky
What soil structure is most prevalent in an E horizon?
platy
Where is granular soil structure most prevalent?
A horizon
What is a granular structure?
circleish aggregates that are separated from each other in a loosely packed arrangement. Usually from less than 1 to as large as 10mm in d.
What is a platy structure?
relatively think horizontal peds or plates. can be inherited from PM
What is a blocky structure?
peds that are irregular, roughly cubelike, and range from 5 to 50 mm across. molded by the shape of the surrounding blocks
What is a prism like structure?
They are vertically oriented prism or pillar like peds that vary in height.
What can soil color determine?
drainage, weathering, OM, and soluble constituents
What darkens soils?
soil organic matter
What provides brown, red yellow, and orange colors?
Iron oxides
What color does carbonates produce?
whitish colors
What color do reduced Fe oxides give soils?
gray and green colors
The more weathered a soil the more likely its color will be___ under oxidizing conditions
red
What does a dominant grey color mean?
gleying
What does gleying indicate?
highly reduced and poorly drained soils.
