FIGURE 8.

Effect of adding far-red radiation (FR) on top of red and blue at three planting densities. Percentages are the RB + FR increment on top of RB. Abbreviations within schemes are as follows: FW_leaf, leaf fresh weight; DW_leaf, leaf dry weight; FW_leaf/DW_leaf, leaf fresh/dry weight ratio; DW_plant, plant total dry weight; Leaf:Plant, ratio of leaf dry weight in total plant; LUE_int, intercepted light use efficiency; I_int, canopy-intercepted photosynthetic photon flux density; $\overline{\text{LA}}$, plant leaf area; $\overline{\mathrm{PLA}/\mathrm{LA}}$, projected leaf area and leaf area ratio; $\overline{\text{SLA}}$, specific leaf area; $\overline{\text{LW}}$, leaf weight. The $\overline{\text{LA}}$, $\overline{\mathrm{PLA}/\mathrm{LA}}$, $\overline{\text{SLA}}$, and $\overline{\text{LW}}$ are all averaged values over 14, 21, and 28 days after transplanting (DAT) representing cumulative values during the whole cultivating period (0–28 DAT). ^∗P < 0.10, ^∗∗P < 0.05, and ^∗∗∗P < 0.01. Data are means of two (n = 2) or three blocks (n = 3) each with four–six replicate plants.