Fig. 6From: 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 chlorophyll a, chlorophyll b and carotenoids in wheat leaves. 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