Fig. 5. Hourly averages of net radiation (Rn), latent heat (LE), and sensible heat (S) fluxes measured (symbols ± SE) and simulated (lines) from 24 to 28 Apr. 1996 (DOY 115–119) 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