Question:
Which of the following instruments is NOT used for determination of soil moisture content?
Which of the following instruments is NOT used for determination of soil moisture content?
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Current meter = Water velocity in open channels.
Soil moisture instruments = Tensiometer, Gypsum block, TDR probe, Neutron probe.
Soil moisture instruments = Tensiometer, Gypsum block, TDR probe, Neutron probe.
Updated On: Sep 4, 2026
- Tensiometer
- Current meter
- Electric resistance meter
- Neutron moisture meter
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Soil moisture determination instruments measure soil water content directly or via matric potential, electrical resistance, dielectric permittivity, or neutron thermalization.
Step 2: Detailed Explanation:
1. Tensiometer: Measures soil matric suction/tension in the range of 0 to 0.85 bar.
2. Electrical Resistance Blocks (Gypsum blocks): Measures soil water matric potential via electrical resistance between embedded electrodes.
3. Neutron Moisture Meter: Emits fast neutrons and measures thermalized slow neutrons to quantify volumetric soil moisture.
4. Current Meter: An instrument equipped with revolving cups or a propeller used exclusively to measure water flow velocity in open channels, rivers, and canals.
Step 3: Final Answer:
Hence, a Current meter is NOT used for determining soil moisture content, corresponding to option (B).
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