Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are)true for the electrical resistance block? A)requires "destructive sampling" for each measurement B)good to turn on automatic irrigation at -50 kPa C)used to turn on irrigation when soil moisture potential reaches -200 kPa D)would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture E)both A and D

Question

Quizplus · Accepted Answer

The electrical resistance block is commonly used to turn on irrigation when soil moisture potential reaches -200 kPa. Option A is incorrect because the electrical resistance block does not require destructive sampling. Option B is incorrect because -50 kPa is a very high soil moisture potential and would result in over-irrigation. Option D is also incorrect because the electrical resistance block readings are affected by soil texture and would not give the same reading for a loamy sand and a silt loam containing 15% moisture. Therefore, the correct choice is C.

Which of the Following Statements Concerning Applications or Capabilities of Soil