At which of the following soil moisture potentials (expressed as kPa) is the soil water held most ...

At which of the following soil moisture potentials (expressed as kPa) is the soil water held most tightly?
 
  A) -3100 B) -31 C) -1500 D) +5 E) 0

Question 2

Which of the following means of estimating soil water levels gives a direct measurement of the water content?
 
  A) neutron scattering
  B) tensiometer
  C) pressure membrane
  D) gravimetric determinations
  E) gypsum blocks

Question 3

Which of the following best characterizes the field capacity of a soil?
 
  A) soil with water potential of -1500 kPa
  B) maximum capacity of a soil to hold water
  C) a wetted soil prior to the removal of the gravitational water
  D) water content of a soil with water potential of about -10 kPa
  E) the total capillary water in a soil

Question 4

The matric potential of soil water is ________.
 
  A) is generally higher than that of pure water outside the soil
  B) is lower in a sandy soil with 20 percent soil water than in a clay soil with same percentage of moisture
  C) influenced greatly by the content of salts in the soil
  D) not influenced appreciably by the force of gravity
  E) is little affected by soil solids