A device for measuring percolation and leaching losses from a column of soil under controlled conditions is known as

A lysimeter is a device used to measure percolation and leaching losses from a column of soil under controlled conditions.

It helps in studying water movement, nutrient loss, and soil-water balance, which are crucial for irrigation and soil management.

Lysimeters are commonly used in agricultural research to understand evapotranspiration, groundwater recharge, and pollutant transport in the soil.

Other options: Infiltrometer measures the rate of water infiltration into the soil.

Odometer is used for measuring soil compaction and consolidation.

Psychrometer is an instrument for measuring humidity.