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Effects of Si on the biomass of Pennisetum under Cd stress. (a,c) shoot and root biomass of P. glaucum × P. purpureum; (b,d) shoot and root biomass of P. glaucum. Values are mean ± SE (n = 3). * indicates significant difference between different treatments of the same variety, according to one-way ANOVA followed by the Duncan test (p < 0.05).
