Fig. 4From: Effect of nano-calcium carbonate on morphology, antioxidant enzyme activity and photosynthetic parameters of wheat (Triticum aestivum L.) seedlingsEffects of different concentrations of nano-calcium carbonate on root, stem and leaf biomass of wheat seedlings. The different letters above the error line represent the significant difference in the mean values of different treatments of the same measurement item (P < 0.05)Back to article page