Two field experiments were conducted at Shandaweel Agric. Res. Station in 1998 and 1999, summer seasons in a split-plot design with four replicates. Winter crops were in main plots and N rates in the sub plots. N rates were 90, 105 and 120 kg N/fed for maize and 45, 60 and 75 kg N/fed for sunflower. Highly significant differences due to the preceding winter crop were obtained in plant growth characters and yield of maize and sunflow‌er. Values were maximum after faba bean and minimum after wheat. Seed yield/fed. of maize and sunflower grown after faba bean were 15.2 and 17.72 higher than those grown after wheat, respectively. All growth characters of maize and sunflower were increased by increasing N levels up to 120 kg fil/led for maize and 75 kg Nfied. for sunflower. The increments in grain yield of maize as affected by adding 120 kg N/fed. over 105 and 90; g N/fed. were 7.2 and 14.5 %. respec‌tively. Seed yield of sunflower fertilized with 75 kg N/fed. was 6.3 and 13.3, respectively, higher than yields obtained with 60 and 45 kg N/fed. Yields of maize and sunflower grown after faba bean and fertilized with 90 kg N/fed. for maize and 45 kg N/fed for sunflower were similar to yields obtained after wheat and fertilized with 120 kg N/fed. for maize and 75 kg N/fed. for sunflower.