Table 1. The composition of spectral components in controlled-environment growth chambers.
| Treatment | Photon flux density, μmol m-2 s-1 | ||||
|---|---|---|---|---|---|
| 447 nm | 638 nm | 665 nm | 731 nm | Total | |
| B | R | R | FR | ||
| During growth | |||||
| B,R638,R665,FR | 17.6 | 84.4 | 127.4 | 1.6 | 231 |
| 3-day treatment | |||||
| B,R638,R665,FR (control) | 19.0 | 118.4 | 160.4 | 2.2 | 300 |
| B,*R638,R665,FR1 | 15.8 | 171.3 | 111.4 | 1.5 | 300 |
| B,R638,*R665,FR2 | 14.3 | 79.1 | 204.9 | 1.7 | 300 |
| R638 | 0.0 | 300 | 0.0 | 0.0 | 300 |
| R665 | 0.0 | 0.0 | 300 | 0.0 | 300 |
1Increased PPFD level during 3-day treatment, further in the text B,*R638,R665,FR will be marked as *R638; where an * means an increased level of red (638 nm) component;
2Increased PPFD level during 3-day treatment, further in the text B,R638,*R665,FR will be marked as *R665; where an * means an increased level of red (665 nm) component;
B–blue light; R–red light; FR–far-red light.