3.2. Growth characteristics
The fresh and dry weight of plants were the highest under FLR.
The fresh weight of shoot increased by 159%, 100% and 46%, respectively
under FLR, FLB and R treatments compared with FL (Table 2).
In contrast, growth was severely inhibited under monochromatic
B or RB lights, showing the lowest fresh and dry weight. The stem
diameter was significantly higher under the mixture of FL and R
or B LED than that under monochromatic R or B. The highest stem
length was observed in R plants, followed by FLR, while the lowest
was observed in B plants. The number of leaves was the smallest
under B but not significantly different among other treatments.
Plants grown under FL and B showed the lowest S/R ratio while the
highest S/R ratio was obtained under FLB followed by R.