It can be the predictive control system for the greenhouse irrigation process. The important objective of control system is to maintain the desired humidity level, keeping the water usage as low as possible. The event-based control scheme uses a crop transpiration model and a water content virtual sensor to trigger the irrigation system events. In that scheme, the event-based controller determines the water level required to compensate for the irrigation system disturbances. Simulation experiments are performed to analyse the behaviour of the designed system and to study the water supply dynamics to the substrate and subsequent drainage and evaporation. The resulting control system is to adapt the actuation rate to the state of the plant providing the water consumption in efficient way. The obtained results shows that the application of proposed event-based approach for the greenhouse irrigation system allows us to improve the control performance and to reduce the water usage being an important issue in intensive agriculture. The improved control performance is obtained due to event-based approach and the inclusion of information about the plant dynamic response for water supply and transpiration effect.