Tracers Determine Movement of Soil Moisture and Evapotranspiration

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Science  15 Apr 1966:
Vol. 152, Issue 3720, pp. 346-347
DOI: 10.1126/science.152.3720.346


The downward movement of water in soil is a layered one. Marking a certain layer with hydrogen-isotope tracer, and watching its displacement, makes possible a water balance and gives information on evaporation and groundwater recharge.