Figures & data
Figure 1 Total fresh weight (FW) and dry weight (DW) of leaf lettuce (a,c) and qing-geng-cai (b,d) under four nitrogen treatments and at five light intensities (L1–L5). The total FW data represent the mean ± standard deviation (n = 4), and the total DW represent the mean values. An asterisk indicates that the value differs significantly from the control at each light intensity treatment (Dunnett's procedure). PEON, phosphate buffer extractable organic nitrogen.
Figure 2 Height of (a) leaf lettuce and (b) qing-geng-cai under four nitrogen treatments and at five light intensities (L1–L5). The data represent the mean ± standard deviation (n = 4). An asterisk indicates a significant difference from the control at each light intensity treatment (Dunnett's procedure).
Figure 3 Above-ground and root fresh weights (FW) of (a) leaf lettuce and (b) qing-geng-cai under four nitrogen treatments and at two light intensities (L4–L5). The data represent the mean ± standard deviation (n = 4). Nitrogen treatments with different letters at each light intensity treatment indicate a significant difference (Tukey's procedure). The graph legend is the same as that used in Fig. 2.
