Fig. 3. Effect of N treatment on the severity of foliar diseases in the penultimate leaf (A and C), and flag leaf (B and D) of wheat expressed as leaf area with symptoms (%) at Site 1 in 2003 and 2004; and at Site 2 in 2003, 2004, and 2005 growing seasons. Bars labeled with different letters within each site–year are significantly different at P 0.05. The N treatments are: N₁, 0 kg N ha^–1; N₂, 60 kg N ha^–1 all starter; N₃, 100 kg N ha^–1 all starter; N₄, 60 kg N ha^–1 starter + 40 kg N ha^–1 top-dress at boot stage; and N_5, 60 kg N ha^–1 basal + 40 kg N ha^–1 foliar spray GS-45.