Table 4.
Effect of different supplementary LED light spectra (red/blue, 3:1; R: B, with a peak 656 nm, blue, with a peak at 450 nm, red, with a peak at 656 nm, control (ambient light)) on reproductive growth characteristics of four strawberry cultivars. The photosynthetic photon flux density (PPFD) was 215 ± 5 mol m− 2 s− 1. The photoperiod of 11/13 h (day/ night) was maintained
| Strawberry cultivar | Light spectrum | Fruit No. (plant− 1) |
Inflorescence No. (plant− 1) |
Flower No. (plant− 1) |
Ripe fruit No. (plant− 1) |
Fruit length (mm) |
Fruit mass (g fruit− 1) |
Early fruit yield (g plant− 1) |
|---|---|---|---|---|---|---|---|---|
| “Sabrina” | Control | 1.33 ± 0.58d | 2.33 ± 1.15c | 4.67 ± 2.91 fg | 1.33 ± 0.58bc | 25.21 ± 8.54 cd | 4.39 ± 1.63e | 5.22 ± 3.39ij |
| Red | 6.00 ± 2.67abc | 4.33 ± 1.45b | 5.00 ± 1.86 fg | 3.33 ± 1.45abc | 24.56 ± 1.16 cd | 5.78 ± 0.50cde | 17.34 ± 1.49f | |
| Blue | 5.33 ± 3.18bc | 5.00 ± 2.51b | 22.00 ± 8.32b | 5.00 ± 2.33a | 26.04 ± 2.62bcd | 7.51 ± 1.48b-e | 18.85 ± 6.25ef | |
| Red/Blue | 5.00 ± 2.00bc | 2.67 ± 3.00c | 3.00 ± 3.00 g | 5.00 ± 1.33a | 28.93 ± 9.84bcd | 4.17 ± 2.12e | 19.59 ± 6.17ef | |
| “Albion” | Control | 1.67 ± 0.67d | 2.67 ± 1.20c | 2.67 ± 1.97 g | 1.00 ± 0.33c | 25.00 ± 12.33 cd | 7.58 ± 4.92b-e | 5.25 ± 4.92ij |
| Red | 3.67 ± 2.03 cd | 3.67 ± 2.03bc | 6.00 ± 3.18efg | 2.33 ± 1.15abc | 25.35 ± 2.06 cd | 5.41 ± 1.21de | 10.62 ± 6.42gh | |
| Blue | 3.67 ± 1.67 cd | 4.33 ± 1.86b | 15.33 ± 9.87 cd | 2.33 ± 0.67abc | 22.87 ± 8.01d | 5.88 ± 2.03cde | 10.58 ± 2.03gh | |
| Red/Blue | 9.00 ± 6.02a | 9.66 ± 4.63a | 18.33 ± 8.33bc | 5.00 ± 3.67a | 40.31 ± 0.93a | 14.93 ± 0.76a | 49.39 ± 3.33a | |
| “Parous” | Control | 5.67 ± 3.48 cd | 4.00 ± 2.31bc | 9.67 ± 6.12ef | 3.33 ± 1.76abc | 31.45 ± 1.73bc | 8.78 ± 0.62b-e | 26.34 ± 1.86 cd |
| Red | 5.67 ± 1.76bc | 5.33 ± 1.33b | 11.00 ± 15.76de | 3.33 ± 1.33abc | 26.25 ± 3.80bcd | 8.52 ± 3.27b-e | 23.38 ± 10.68cde | |
| Blue | 6.67 ± 3.33abc | 5.67 ± 2.96b | 27.00 ± 12.00a | 3.33 ± 1.15abc | 33.11 ± 0.94b | 11.42 ± 0.76ab | 22.53 ± 10.99de | |
| Red/Blue | 9.00 ± 6.24a | 3.67 ± 2.33bc | 9.33 ± 7.55ef | 4.33 ± 2.96abc | 30.56 ± 0.34bc | 10.28 ± 1.03bc | 27.88 ± 5.53c | |
| “Camarosa” | Control | 1.33 ± 0.88d | 2.00 ± 1.15c | 6.00 ± 4.16efg | 1.00 ± 0.33c | 24.46 ± 7.91 cd | 5.18 ± 1.80de | 3.85 ± 1.80j |
| Red | 4.33 ± 2.19 cd | 2.00 ± 1.00c | 4.67 ± 3.70 fg | 3.00 ± 1.53abc | 25.04 ± 1.75 cd | 5.22 ± 0.81de | 14.99 ± 2.23 fg | |
| Blue | 8.33 ± 6.03ab | 4.00b ± 2.61c | 10.33 ± 8.43e | 4.67 ± 3.23ab | 31.75 ± 1.04bc | 9.79 ± 1.94bcd | 39.18 ± 7.77b | |
| Red/Blue | 6.33 ± 4.41abc | 5.00 ± 3.60b | 7.67 ± 5.45efg | 4.00 ± 3.06abc | 30.36 ± 1.99bcd | 8.73 ± 0.71b-e | 34.92 ± 2.84b |
Mean separation was done by Duncan’s multiple range test and the same letter(s) in each column indicates non-significant difference at P ≤ 0.05.