According to the best-fit model predictions, greater percentage
of canopy photosynthesis of pot chrysanthemum canopy (47–51%)
was observed at the middle canopy due to relatively high percentage of leaf area (47.6%) (Fig. 6a). Even though the percentage leaf
area was lower at the younger leaves in the upper canopy layer
(23.5%), their contribution to canopy photosynthesis was comparatively high (30–32%). In contrast, the lower levels of the canopy
which comprises a significantly large leaf area (28%) contributed only 18–20% of the canopy photosynthesis. The greatest influence
of CO2enrichment on canopy photosynthesis was observed in the
middle canopy as the canopy photosynthesis increased by 26.8% at
high CO2concentration compared to the lower CO2concentration
(Fig. 6b). Even though the lower leaf layer contributed to a greater
percentage of the total LAI (i.e., 28%) CO2enrichment around the
canopy did not increase the canopy photosynthesis