Fig. 5.
Predicted and measured diurnal net canopy photosynthesis rate (Ac) on three different days. The measured hourly average photosynthetic photon flux density (PPFD) (A–C; n=6), Ac under low-nitrogen treatment (D–E; n=3) and high-nitrogen treatment (G–I; n=3) for rice cultivar XS134 during the daytime are shown. The simulation of diurnal Ac assumed all the incident light to be direct light only (DL) or scattered light only (SL). Diurnal light environments from three days with different weather conditions, an overcast day (12 September; A), a cloudy day (18 September; B), and a sunny day (13 September; C), were used in the simulations.