Plastic film (1), which can be positioned horizontally or vertically, laid on the soil or buried in it, is supple and made from at least one conducting polymer with an electric current passing through it. It can be in a single layer of a polymer with an added conducting material such as carbon or steel or stainless steel wires in a non-conducting polymer matrix, or a mixture of conducting and non-conducting polymers. - Plastic film (1), which can be positioned horizontally or vertically, laid on the soil or buried in it, is supple and made from at least one conducting polymer with an electric current passing through it. It can be in a single layer of a polymer with an added conducting material such as carbon or steel or stainless steel wires in a non-conducting polymer matrix, or a mixture of conducting and non-conducting polymers. An electrical current is fed to the plastic film through connectors (2, 7), using a low tension, high intensity transformer (3), a temperature regulator (4) and sensors (5).
