The process uses electro-osmosis and involves using an electrode, acting as a cathode, which is laid in the vegetation zone of soils underneath the soil surface and is connected to a positive electrode, laid in a deeper soil zone, via a system of lines. When connected, the circuit completed via the electric field is operated by its own potential difference or by external voltage like other circuits. In a first process step, an electric field is set up between a positive electrode (62), laid in a soil layer (2) below the roots (9,10,11,12), and a negative electrode, as cathode (61), laid between the ends (28,59) of the roots and the soil surface (3). Thereafter, a deeper zone (14), in particular a zone bearing water, is activated by means of a positive electrode as the anode (50). This zone is connected up to the two electrodes (61,62) which are connected to negative potential and are arranged in the area of the roots.
