Abstract
Investment in agriculture using Greenhouses is one of the most important investments in Saudi Arabia. That is due to the potential of Greenhouses to produce vegetable crops with higher yield, and to save the water use, compared to the traditional open field agriculture. This complies with the strategic role of the agricultural sector to bridge the food gap, and to achieve the national food security in Saudi Arabia. The main objective of this study is to determine the net economic return of Greenhouses cucumbers and tomatoes using different water qualities in Saudi Arabia. Results show that the production of cucumbers and tomatoes in Greenhouses using different water qualities with salt concentration varies between 800-1400 PPM, would generate high net economical return to investors, and would give high water return too.