Table 2.
Subgroup analysis reporting heterogeneity (I2) and percentage (P) by response ratio (Yield, Yield; TSS, soluble solid content; Asc, ascorbic acid content; Chl, chlorophyll content; PN, photosynthetic capacity; gs, stomatal conductance; LA, leaf area) and total percentage (Tot P) of subgroups considering 104 total observations used in the meta-analysis.
| Yield | TSS | Asc | gs | PN | Chl | LA | Tot | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (k = 68) | (k = 38) | (k = 20) | (k = 26) | (k = 45) | (k = 40) | (k = 38) | (k = 104) | ||||||||
| I2 (%) | P(%) | I2 (%) | P (%) | I2 (%) | P (%) | I2 (%) | P(%) | I2 (%) | P (%) | I2 (%) | P(%) | I2 (%) | P(%) | Tot P (%) | |
| Control type | |||||||||||||||
| Solar light | 92.2 | 69.1 | - | 97.4 | - | 85.0 | - | 100.0 | - | 97.8 | - | 90.0 | 79.8 | 86.8 | 80 |
| Solar + HPS | 12.7 | 30.9 | - | 2.6 | - | 15.0 | - | 0.0 | - | 2.2 | - | 10.0 | 77.5 | 13.2 | 20 |
| Lamp type | |||||||||||||||
| LED | 92.6 | 64.7 | - | 94.7 | - | 80.0 | - | 92.3 | - | 93.3 | 75.1 | 87.5 | 78.9 | 86.8 | 76 |
| LED+HPS | 28.9 | 35.3 | - | 5.3 | - | 20.0 | - | 7.7 | - | 6.7 | 49.9 | 12.5 | 67.5 | 13.2 | 24 |
| DLI | |||||||||||||||
| <10 | 76.9 | 52.9 | 34.4 | 44.1 | 81.6 | 45.0 | 88.1 | 65.4 | 87.6 | 55.6 | 81.1 | 50.0 | 72.5 | 50.0 | 42 |
| >=10 | 93.2 | 47.1 | 36.7 | 55.9 | 71.2 | 55.0 | 93.7 | 34.6 | 92.2 | 44.4 | 56.9 | 50.0 | 83.5 | 50.0 | 58 |
| Photoperiod | |||||||||||||||
| <16 | 80.8 | 35.3 | 45.5 | 41.9 | 84.4 | 45.0 | 92.8 | 34.6 | 90.3 | 37.8 | 88.5 | 30.0 | 35.8 | 34.2 | 30 |
| >=16 | 91.1 | 64.7 | 28.6 | 58.1 | 71.3 | 55.0 | 91.4 | 65.4 | 90.4 | 62.2 | 43.2 | 70.0 | 84.9 | 65.8 | 70 |
| Natural light | |||||||||||||||
| Decreasing | 86.6 | 30.5 | 52.9 | 33.3 | 84.9 | 38.9 | 91.2 | 28.0 | 95.8 | 27.0 | 0.0 | 16.1 | - | 11.1 | 30 |
| Increasing | 91.2 | 69.5 | 21.2 | 66.7 | 67.7 | 61.1 | 90.4 | 72.0 | 83.2 | 73.0 | 66.2 | 83.9 | - | 88.9 | 70 |
| Light supply | |||||||||||||||
| Intracanopy | 91.9 | 72.1 | 36.9 | 84.2 | - | 80.0 | 92.6 | 62.2 | 92.9 | 68.9 | 73.4 | 57.5 | 86.7 | 57.9 | 77 |
| Others | 7.4 | 27.9 | 0.0 | 15.8 | - | 20.0 | 84.7 | 30.8 | 81.6 | 31.1 | 71.7 | 42.5 | 45.0 | 42.1 | 23 |
I2 values <25% are reported in bold.