Fig. 2. Mean inorganic N content in the top 0.8-m soil profile, throughout the tobacco growth season in 1998 and 1999 at Bovolone (Verona, northern Italy). Bars are the standard deviation (n = 10, at each date). Variability includes both treatment and random effects. In both years, fertilizer N was applied 2 wk after transplanting. The arrow indicates the time of fertilizer application.