Question

Which of the following statement(s) is/are true for tensiometer?
(A) It measures soil water potential.
(B) It is simple in operation and very useful for scheduling irrigation.
(C) It can also be used for measuring soil water flux.
(D) Although limited to &lt: 1 bar matric potential, this range can be increased by increasing the permeability of its porous cup.

• A. (A), (B) and (C) only.
• B. (A), (B) and (D) only.
• C. A) and (D) only.
• D. (D) only.

Hint:

Tensiometers are best for monitoring water availability in the field, especially in the range close to field capacity.

Answer 1

The Correct Option is A

Step 1: (A) and (B): a tensiometer measures matric potential and is simple for irrigation scheduling, both true.
Step 2: (C): paired tensiometers at two depths give a hydraulic gradient, which with Darcy's law yields soil water flux, true.
Step 3: (D): the roughly 1 bar limit is a cavitation limit of the water column, not something increased porous-cup permeability can fix, so false.
Step 4: Only (A), (B), and (C) hold, matching the first option.