Comparison of Three Methods for Field Measurement of Solute Leaching in a Sandy Soil
- Jan Siemens * and
- Martin Kaupenjohann
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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