Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the electrical resistance block?
A) would give the same reading for both a loamy sand and a silt loam if both contained 15 moisture
B) used to turn on irrigation when soil moisture potential reaches -200 kPa
C) good to turn on automatic irrigation at -50 kPa
D) requires destructive sampling for each measurement
E) both A and D
Question 2Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the capacitance probe?
A) would give the same reading for both a loamy sand and a silt loam if both contained 15 moisture
B) good to turn on automatic irrigation at -50 kPa
C) requires destructive sampling for each measurement
D) used to turn on irrigation when soil moisture potential reaches -200 kPa
E) both A and D
Question 3Which mineral is most resistant to weathering under humid temperate conditions?
A) muscovite B) dolomite C) gypsum D) biotite E) gibbsite
Question 4Soils high in organic matter commonly hold more available water than comparable soils with lower organic matter levels. This is most likely due to what characteristics of the high O.M. soils?
A) higher capacity of the O.M. to hold water tightly
B) lower permanent wilting percentage
C) higher clay content
D) higher field capacity
E) larger micro pore space
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