Optimizing the photon ratio of red, green, and blue LEDs for lettuce seedlings: a mixture design approach

Table 1 Growth parameters of lettuce seedlings after 10 light treatments during the 2-week seedling stage

	Shoot fresh weight (g)	Root dry weight (mg)	Leaf area (cm²)	Specific leaf area (cm² g⁻¹)	Projected leaf area (cm²)	SPAD
R	0.60a	38.7	16.5a	27.7d	12.0d	26.7ab
G	0.33e	31.2	10.2d	31.6abc	10.0d	20.5d
B	0.41cd	55.6	13.4bc	32.7abc	25.8a	29.4ab
RG₁₁	0.49b	32.9	15.2ab	30.8bcd	18.1b	22.9cd
RB₁₁	0.38cde	42.1	11.3cd	29.9cd	10.3d	30.5a
GB₁₁	0.37de	47.1	11.5cd	30.9abcd	13.1cd	27.9ab
RGB₄₁₁	0.50bc	38.1	14.7ab	32.7abc	12.6d	29.7a
RGB₁₄₁	0.50b	36.9	17.3a	34.4a	16.7bc	25.6bc
RGB₁₁₄	0.43bcd	32.7	13.6bc	32.0abc	14.0bcd	28.9ab
RGB₁₁₁	0.50b	25.9	17.5a	33.6ab	17.5b	29.1ab

Different letters indicate statistically significant differences among light treatments at p < 0.001 based on ANOVA and Duncan’s multiple range test (n = 5)

ISSN: 1746-4811