On the effectiveness of 2D electrical inversion results: an agricultural case study

Electrical resistivity tomography was used in Beauce (France) to assess the water extraction by corn plants (evapotranspiration). The acquired pseudos ections show conductive anomalies under the plants. A 2D inversion of measu rements led us to identify clear resistive features associated with the wat er losses under the corn-plant rows. New models have been calculated with t wo different 3D algorithms (finite-difference and moment-method) to take in to account 3D structure of the ground and to confirm that periodic resistiv e features may generate shifted apparent-resistivity anomalies.