Unformatted text preview: PLSOILIN 105 & 106 Quiz One February, 2012 Record your answers on an optically scanned “bubblesheet” for grading. Also record your
answers on this page, so you can ﬁgure out how many questions you got correct when the correct
answers are posted. No quizzes will be returned. Answers will be linked to the course webpage. By deﬁnition, the maximum
diameter of a silt particle is...
2 mm 1 mm 0.1 mm (= 100 pm) 0.05 mm (= 50 [.Lm) 0.002 mm (= 2 pm) In soil science terminology, topsoil is
usually called “loam”. iii: ﬂaunts aWW
CW For soil structures such as small
aggregates (spheroidal) or prisms to
be able to form in soil, which size
class of particles must be present in
soil? Clay Sand Silt A topsoil with many spheroidal
aggregates usually has bulk density than a structureless,
sandy soil with very few aggregates. Higher WWW?) 01631154743
”wet ’1‘ (‘me Macro/0M5 Because water molecules have a
positive end and a negative end,
water is called a polar molecule.
False 6. C?
E. N 9° ®p0w® D. 10. Two or three days after a heavy rain,
gravity has removed all the water
from soil that it can, and the soil
water content is said to be at...
Saturation Field capacity The permanent wilting point The post-gravitational level The hygroscopic coefﬁcient Which one of the soils below
probably contains the most water at
the permanent wilting point? Clay loam Loam Loamy sand Sandy loam Silt loam Increasing the amount of organic
matter in a soil will increase the
plant-available water it can store.
True False During which season of the year,
might a heavy, organic mulch cause
soil temperatures to be less desirable
for gardeners? Spring Summer Autumn q . Winter When will a soil have higher concen-
trations of CO2 in its air-ﬁlled pores? Q) When the soil is at ﬁeld capacity.
B. When the soil is at the permanent wilting point. ...
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- Fall '09