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A SYSTEM FOR MEASURING THE UPTAKE OF IONS BY PLANTS FROM FLOWING SOLUTIONS OF CONTROLLED COMPOSITION = SYSTEME DE MESURE DE L'ABSORPTION DES IONS PAR LES VEGETAUX A PARTIR DE SOLUTIONS EN MOUVEMENT A COMPOSITION CONTROLEECLEMENT CR; HOPPER MJ; CANAWAY RJ et al.1974; J. EXPER. BOT.; G.B.; DA. 1974; VOL. 25; NO 84; PP. 81-99; BIBL. 8REF.Article