[Objective]Excessive applications of nitrogen and irrigation water in greenhouse vegetable production lead to lower nitrogen(N) use efficiency and unsustainable use of land.The aim of this study was to investigate the potential of a saving on N and water in vegetable production and the best combination of N and irrigation rates.[Method]An experiment was conducted in a 4-year cultivated greenhouse with winter-spring cucumber and autumn-winter tomato double cropping system.Two irrigation levels as conventiona...