The leaf photosynthetic rate and stomatal conductance decreased (P = 0.05) in all the cultivars under both clear and turbid water submergence and reduction was greater in IR-20 than Sub 1 cultivars (Fig. 2). Higher stomatal conductance of tolerant cultivars resulted in higher photosynthetic rate than in sensitive ones. Photosynthetic rate was decreased (P = 0.05) up to 24.9, 19.1, and 15.4% in IR-20, IR-64 Sub 1 and Swarna Sub1, respectively, when submerged in turbid water. Post-submergence N either as broadcasting or foliar spray considerably improved Pn rate and Gs, this improvement was more prominent when basal P was applied with N. However, urea broadcasting resulted in 19.6, 13.9 and 11.8% lower Pn rate in IR-20, IR-64 Sub 1 and Swarna Sub1, respectively, over urea foliar spray (Fig. 2). Minimum (P = 0.05) Pn rate and Gs was recorded under control (no fertilizer application) followed by basal P alone.