Effect of fresh water (control, prepared using fresh and rain water (50:50, v/v), untreated fish water (AP<i>unt</i>) and disinfected fish water (AP<i>dis</i>) based nutrient solution on nitrate and mineral content in butterhead lettuce.

The data represent mean values on dry weight matter (DM) or fresh weight basis (FW, only for NO3) ± standard deviation of four mix samples taken randomly from respective three lettuce heads. Mean values were compared using univariate ANOVA and following tested using post hoc Tukey-HSD test or compared by Kruskal-Wallis test (P) and tested using Dunn-Bonferroni test (Mg, Na) (p < 0.05). Significant differences are indicated by different superscript small letters.