Table 2.
Growth lettuce affected by different light intensity × NSC.
| Treatments | Leaf number | Weight (g per plant) | ||||
|---|---|---|---|---|---|---|
| Light intensity (μmol · m−2s−1) | Nutrient solution concentration | Plant FW | Shoot FW | Plant DW | Shoot DW | |
| 150 | 1/4 | 14.33 ± 0.667ef | 44.77 ± 2.832e | 42.00 ± 2.397e | 1.77 ± 0.088 f | 1.53 ± 0.088 f |
| 1/2 | 13.33 ± 0.333 f | 54.57 ± 3.717de | 51.57 ± 3.661de | 2.40 ± 0.153e | 2.17 ± 0.120d | |
| 3/4 | 16.00 ± 0.00bcde | 59.03 ± 1.670d | 55.63 ± 1.670d | 2.33 ± 0.088e | 2.13 ± 0.088d | |
| 250 | 1/4 | 15.33 ± 0.667cdef | 73.70 ± 1.473bc | 68.57 ± 1.671bc | 3.13 ± 0.033d | 2.90 ± 0.000c |
| 1/2 | 14.67 ± 0.333def | 65.37 ± 3.002 cd | 61.83 ± 2.649 cd | 3.37 ± 0.273d | 2.93 ± 0.186c | |
| 3/4 | 17.33 ± 1.202abc | 100.67 ± 2.293a | 94.30 ± 2.381a | 4.00 ± 0.265bc | 3.63 ± 0.233ab | |
| 350 | 1/4 | 17.00 ± 0.577bc | 79.40 ± 5.059b | 73.63 ± 4.589b | 3.53 ± 0.233 cd | 3.13 ± 0.176c |
| 1/2 | 19.33 ± 0.667a | 84.30 ± 6.178b | 77.30 ± 6.564b | 4.10 ± 0.208ab | 3.60 ± 0.208b | |
| 3/4 | 19.33 ± 0.333a | 103.43 ± 4.853a | 95.03 ± 4.133a | 4.60 ± 0.100a | 4.10 ± 0.058a | |
| 450 | 1/4 | 17.67 ± 0.667ab | 75.73 ± 4.083bc | 66.73 ± 4.326bc | 4.13 ± 0.203ab | 3.63 ± 0.203ab |
| 1/2 | 17.67 ± 1.202ab | 98.60 ± 1.054a | 89.73 ± 0.203a | 4.33 ± 0.033ab | 3.90 ± 0.058ab | |
| 3/4 | 16.67 ± 0.333bcd | 81.17 ± 2.674b | 72.77 ± 2.088b | 4.10 ± 0.153ab | 3.60 ± 0.153b | |
| ANOVA (F value) | Light intensity | 20.299** | 63.098** | 52.256** | 86.704** | 89.529** |
| NSC | 4.061* | 24.697** | 23.716** | 13.202** | 14.84** | |
| Light intensity × NSC | 2.973* | 9.972** | 9.471** | 2.564* | 3.513* | |
FW = fresh weight, DW = dry weight. The results showed by mean ± standard error. Different letters mark in tables indicated significant difference (P ≤ 0.05, Tukey’s test). * and ** represented the significant difference at p ≤ 0.05 and p ≤ 0.01, respectively. Significant differences among the treatments were determined by SPSS 17.0 for ANOVA.