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Akteur expressed as ash free dry mass (AFDM) per pot without application of SiO2 to the substrate (Si-0) and with application of 1 g (Si-1), 10 g (Si-10) and 50 g (Si-50) of SiO2. Values are means ± SD (n = 4); different letters indicate significant differences between treatments at p < 0.05.
