3.4. Net photosynthesis rate (Pn)
The Pn of leaves was highest under 300 mol m−2 s−1 and
lowest under 50 mol m−2 s−1. When PPFD increased from 50 to
300 mol m−2 s−1, an increase of the Pn was observed. However,
PPFD exceed than 300 mol m−2 s−1, the Pn significantly decreased