Which of the following statements about a tensiometer is false?

Question

BlackTom AI · Accepted Answer

To begin, consider what a tensiometer is designed to measure and what each option claims.
Option 1: 'measures soil moisture' — A tensiometer actually measures soil water potential (matric suction), not direct volumetric soil moisture content. While there is some relationship between water potential and moisture status, the device does not provide a direct measure of how much water (volume) remains in the soil. This makes the statement imperfect or misleading as a description of what a tensiometer reads.
Option 2: 'measures amount of water left in the soil' — This phrasing targets the total water content in the soil, i.e., volume-based moisture. A tensiometer does not quantify water content; it measures the tension (matric potential) required to extract water from the soil pores. Therefore, this statement is inaccurate.
Option 3: 'measures how tightly water is held to the soil particles' — This accurately describes matric potential: the suction or tension required to remove water from the soil, which reflects how tightly water is held by soil aggregates and particles. This is a core function of tensiometers.
Option 4: 'normally used for crops that are sensitive to water stress' — Tensiometers are commonly employed in irrigation management, especially for crops that respond to soil water potential and water stress. They guide irrigation timing to prevent stress, supporting this use case.
In summary, while option 1 touches on related concepts, and option 3 and 4 describe core aspects or typical uses of tensiometers, option 2 explicitly claims a measurement (amount of water left) that a tensiometer does not provide, making it the false statement among the choices.

Which of the following statements about a tensiometer is false? 单项选择题

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