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NH4+ concentration in leaves (a), roots (c) and rhizomes (e) and NO3− concentrations in leaves (b), roots (d) and rhizomes (f) (Mean ± SE) of Acorus calamus grown on diluted anaerobic digester effluent (25% and 50%) and undiluted anaerobic digester effluent (100%) for a period of 56 days. Different letters indicate significant differences among treatments.
