The GATE Grind

GATE 2025 AG – Question 40

Irrigation and Drainage Engineering · Soil-Water-Plant Relationship · 2 marks · Multiple select

A lysimeter is used to measure which processes? Select all that apply.

  1. Evaporation
  2. Infiltration
  3. Evapotranspiration
  4. Deep percolation

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Show answer and explanation

Correct answer: (C) Evapotranspiration; (D) Deep percolation

Explanation

A cropped soil lysimeter measures combined evapotranspiration through its water balance or weight change, and a drainage lysimeter collects deep percolation. It does not directly separate evaporation from transpiration in that standard cropped configuration or serve as an infiltration test. Under the source’s intended use, the selections are **C, D**. Bare-soil lysimeters can separately study evaporation, but that broader use is not included in the official key.

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