The use of magnetic technology in irrigation is increasing significantly in the world as it has been established in several research studies that its application on irrigation water can improves crop productivity and even alleviate plant salt stress. The aim of this study was to investigate the effect of magnetic treatment of saline water on greenhouse tomatoes in Morocco. The preliminary results showed significant decrease in soil conductivity measured at different depths. The soil irrigated with magnetically treated water had a high-water retention capacity. A slight increase in the yield with plants exhibiting an early flowering was recorded, and fruit quality was also improved in terms of weight and juice content.