Fig. 2. Hourly averages of net radiation (R_n), latent heat (LE), and sensible heat (S) fluxes measured (symbols ± SE) and simulated (lines) from 6 to 10 Mar. 1996 (DOY 66–70) under 363 µmol mol^-1 CO₂ and (a) 35 g N m^-2 and (b) 7 g N m^-2 fertilization. Negative values represent upward fluxes