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Table 4 Lettuce leaf composition of the dry matter (dm) (range […, …] samples, n = 2)

From: Comparison of Lactuca sativa growth performance in conventional and RAS-based hydroponic systems

Parameter Unit System HP System RAS ANOVA
K+ mmol kg−1 dm−1 1808.00 [1795, 1821] 2327.50 [2325, 2330] p = 0.000
Na+ mmol kg−1 dm−1 25.50 [25, 26] 91.90 [86.1, 97.7] p = 0.008
Ca2+ mmol kg−1 dm−1 325.00 [314, 336] 408.50 [396, 421] p = 0.038
Mg2+ mmol kg−1 dm−1 167.00 [160, 174] 206.50 ± 7.78 [201, 212] p = 0.047
N mmol kg−1 dm−1 3708.00 [3526, 3890] 3909.50 [3864, 3955] p = 0.395
P mmol kg−1 dm−1 311.00 [306, 316] 369.00 [353, 385] p = 0.075
Fe2+ mmol kg−1 dm−1 3.25 [3.1, 3.4] 3.70 [3.3, 4.1] p = 0.403
Mn2+ mmol kg−1 dm−1 3.55 [3.4, 3.7] 4.80 [4.6, 5.0] p = 0.038
Zn2+ mmol kg−1 dm−1 15.50 [15, 16] 7.35 [6.5, 8.2] p = 0.014
B mmol kg−1 dm−1 3.20 [3.2, 3.2] 3.05 [3.0, 3.1] p = 0.095
Mo6+ μmol kg−1 dm−1 25.20 [24.6, 25.8] 18.10 [17.2, 19.0] p = 0.022
Cu2+ μmol kg−1 dm−1 170.50 [170, 171] 148.50 [142, 155] p = 0.078