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DIVISION S-1—NOTES

Comparison of Three Methods for Field Measurement of Solute Leaching in a Sandy Soil

Institute of Ecology, Dep. of Soil Science, Berlin Univ. of Technology, Salzufer 11-12, D-10587 Berlin, Germany

^* Corresponding author (jan.siemens{at}tu-berlin.de).

To identify the most suitable technique for measuring solute leaching in a sandy soil, we compared three methods in an irrigation experiment (irrigation rates: 5 and 2.4 mm h^–1) using Cl^– as a tracer. We tested tensiometer-controlled suction plates, wick samplers, and ion-exchange resin boxes installed between fiberglass pads. Ten samplers of each type were installed at a 52-cm depth (suction plates) or a 60-cm depth (wick and resin box samplers) into soil monoliths. The recovery of water and Cl^– by the suction plates varied little with irrigation rate (107–118%). The wick samplers performed well during 5 mm h^–1 irrigation (Cl^– recovery: 111%; water recovery: 103%). However, at the irrigation rate of 2.4 mm h^–1, the water recovery was significantly lower (70%), probably because the soil suction exceeded the maximum capillary force of the wicks. The wicks did not induce a retardation or additional dispersion of Cl^– compared with suction plates. The recovery of Cl^– by the resin boxes was only 6%. Tensiometer-controlled suction plates allowed an overall satisfactory estimation of water and solute fluxes in the sandy soil.

Abbreviations: BTC, breakthrough curve • CDE, convection-dispersion equation • CLT, convective lognormal transfer function

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