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Heavy Water Tracing of Soil-Water Transfers Under Irrigation¹

ABSTRACT

In soil columns, a horizon was labeled with heavy (deuterated) water (D₂O), and the evolution of D₂O during the experiment was monitored in situ by gamma-neutron counting. An automatic irrigation device was used for crop watering.

Based on the results of two consecutive experiments (H₂O and D₂O balance and water transfer analysis), the system was found to provide fully satisfactory irrigation. Deuterated water labeling, moreover, proved to be an effective technique for evaluating root uptake in a soil horizon.

¹ Contribution from the Atomic Energy Commission, Biol. Dep., Radio-Agronomy Service, CEN Cadarache BP no. 1, 13115 SAINT-PAUL-LEZ-DURANCE (FRANCE). S-304, 1982 Series.

² Engineers, Atomic Energy Commission.

Received for publication March 26, 1981. Accepted for publication October 5, 1981.