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Saudi Arabia has a citrus growing area of 16,000 ha. Oranges, mandarins, grapefruits, lemons and limes are the major fruit species. The Najran Valley, located in the South-West of the country, is the most important citrus growing region. Economic, climatic and pedogenic problems - first of all scarcity of water and increasing soil salinity - are the most significant constraints for citrus growing. This article describes the citrus production in the Najran Valley as well as recent activities to secure and improve fruit quality.