Table 2.
The effect of LED inter-lighting on growth of single-truss tomato plants.
| Growth parameters | |||||
|---|---|---|---|---|---|
| Stem diameter (mm) | Internode length (cm) | LAI | LMA (g m-2) | ||
| Summer | Control | 10.2 ± 0.6b | 9.6 ± 0.7a | 4.7 ± 0.4a | 38.3 ± 5.3b |
| Day LED | 11.1 ± 0.9a | 8.2 ± 0.7b | 5.1 ± 0.5a | 46.0 ± 1.6a | |
| Night LED | 11.8 ± 0.8a | 8.7 ± 0.9b | 5.0 ± 0.6a | 46.9 ± 5.3a | |
| Winter | Control | 11.1 ± 0.7b | 10.6 ± 1.0a | 3.6 ± 0.7a | 43.1 ± 6.3b |
| Day LED | 12.2 ± 1.1a | 9.1 ± 0.9b | 3.7 ± 0.9a | 47.1 ± 6.2a | |
| Night LED | 11.8 ± 0.8a | 9.3 ± 0.9b | 3.7 ± 1.0a | 51.5 ± 3.2a | |
Stem diameter and internode length were measured just under the fruit truss. Both leaf area index (LAI) and leaf mass per unit area (LMA) were measured from individual leaves, and the cumulative value for a plant was used for the analysis. Data represent means ± SE (n = 15 for stem diameter and internode length, n = 5 for LAI and LMA). Different letters indicate statistically significant differences by Tukey’s HSD (P < 0.05).