Fig. 1.

Calculated green area index (GAI) cumulated from the canopy top vs. the predicted PAR (J m⁻² d⁻¹) intercepted by entities at flowering, expressed relative to PAR above the canopy for each type of entity. The solid line represents laminae, the dotted line vertical entities. Symbols represent values for each entity, calculated for the middle exposed height of the entity. Laminae are denoted by La, sheaths by S and internodes by I, numbered according to their rank from the top (n being the flag leaf).