Ion Competition in Manganese Uptake by Barley Plants

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Abstract
Barley plants grown in Hoagland''s solution developed Mn toxicity symptoms in the leaves. The symptoms and Mn content of the tissues were reduced by increasing the macro-salt concentration in the nutrient solution. Using high single salts superimposed on a weak, balanced nutrient solution, it was found that Ca, Mg, or NH4 nitrates or sulfates lowered Mn uptake. Nitrate and sulfate of K and Mg phosphate had no effect. Plants grown in Ca or NH4 phosphate were lower in Mn, while K phosphate plants were higher than the control. Sodium salts behaved like those of K. Iron and H ions were the most effective in reducing Mn uptake.