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This study was carried out to determine the interaction among NH 4  + , NO 3  - , and Cl -  ion uptake and to find the causes of NH 4  +  -related toxicity symptoms in plants fed with NH 4  +  as a sole nitrogen source. Seedling plants established in peat-lite and rockwool media were fed with nutrient solutions containing either NH 4  +  or NO 3  -  or both NH 4  +  plus NO 3  -  with or without Cl - . Plants grown with NH 4  +  + Cl -  contained the highest levels of Cl - . Plants fed with NO 3  -  + Cl -  also showed high levels of Cl -  in the tissue. The growth and tissue Cl -  contents of plants fed with NH 4  +  were not affected by changes in Cl -  concentration in the nutrient solution. Plants fed with NH 4  +  that was ion-balanced by high levels of SO 4  2-  plus low or no Cl -  still developed the NH 4  +  -related toxicity symptoms. This indicates that NH 4  +  -related toxicity symptoms occur independently of Cl - . It was also shown that the activity of Cl - , a counterion for NH 4  +  uptake, was suppressed by NO 3  - .

INFLUENCES OF NH4+ AND NO3- ON UPTAKE OF Cl- IONS BY AGERATUM, PETUNIA, AND SALVIA