A two-wire controlling and monitoring system for in particular irrigation of localised areas of soil comprises a water pipeline, a first plurality of controllable irrigation valves, a third plurality of localised irrigation control units each comprising a line decoder. The two-wire controlling and monitoring system further comprises a controller and power supply unit having a set of schedules of instructions and having a pair of control and power outputs supplying power to one of the pair of control and power outputs, and a two-wire cable interconnecting said controller and power supply unit and said third plurality of localised irrigation control units. The controller and power supply unit transmits the schedules of instructions to the third plurality of localised irrigation control units through the two-wire cable and receives the specific irrigation parameters from the third plurality of localised irrigation control units through the two-wire cable.
