Figure 4.

Leaf fresh (a) and dry weight (b), leaf numbers (c), leaf area (d), shoot dry weight (e), and root dry weight (f) of nasturtium grown under CL-200, CL-300, and CL-400 at 7, 14, and 21 days after treatment. CL-200, CL-300, and CL-400 represent the light period of 24 h per day with a light intensity at 200, 300, and 400 µmol m⁻² s⁻¹, respectively. Values are the means ± SE (n = 8). Different alphabet letters indicate significant differences between the treatments, the signs, ¹*, ²*, ³*, ⁴*, or ⁵* put after the alphabet ‘a’ at the largest mean for each parameter and each ‘days after treatment’, indicating that the probability of the ANOVA (the multiple mean comparison by Tukey) was p < 0.05, p < 0.01, p < 0.001, p < 1.0 × 10⁻⁴, or p < 1.0 × 10⁻⁵, respectively. The plant density during the 1st, 2nd, and 3rd weeks was 16.7, 11.1, and 5.6 plants m⁻², respectively.