Influence of chloride on the uptake and trans‐location of phosphorus in potato

Abstract

Both chloride (Cl) and sulphate (SO₄) were found to impair the uptake of phosphorus (H2³²PO₄) through the roots of potato in a hydroponically conducted experiment. Radioactive phosphorus (³²P) was used as the marker. The presence of either Cl and SO₄ alone in the nutrient solution made no difference on the impairment. Both ions also inhibited the long‐distance transport of P from roots to shoots. The inhibition by Cl was much greater than that by SO₄, and increased with the concentration of Cl rising from 0 to 15.5 mM in solution.