A lysimeter is a device that can be used to measure the amount of actual evapotranspiration which is released by plants (usually crops or trees). Evapotransipiration is a combination of evaporation and transpiration, and describes the movement of water from the earth’s biosphere (in plants) to the atmosphere.
Definition: “A device for collecting water from the pore spaces of soils and for determining the soluble constituents removed in the drainage”. Early devices, called pan lysimeters, collected soil water as it percolated down via gravity through saturated soils. The major limiting factor of a pan lysimeter was that fluids could only be gathered under saturated gravity flow.
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