The effect of different irrigation frequencies (5, 7 and 9 days interval) and N rates (0, 50, 100 and 150 kg N ha(-1)) on applied N in tomato was studied in a field experiment during 3 growing seasons. The application of 100 kg N ha(-1) with irrigation scheduled at 7 days interal resulted in significantly higher N uptake and recovery rate than the other combinations of N rate and irrigation frequencies studied.