Table 1.
Environment |
R : FR* |
Air humidity (%) |
PPFD† (µmol m−2 s−1) |
Air temperature (°C) |
---|---|---|---|---|
Greenhouse | 1·2 | 59 ± 19 | 670 | 28 ± 6 |
Growth room | 1·4 | 61 ± 18 | 194 | 23 ± 2 |
Forest | 0·5 | 76 ± 10 | 22‡ | 22 ± 2 |
Red-to-far red ratio measured at the same time as PPFD.
PPFD (photosynthetically active photon flux density) measured at about 1200 h.
The forest environment also showed sunflecks within the range 200–700 μmol m−2 s−1 PPFD.