The Effect of pH on the Uptake and Accumulation of Phosphate and Sulfate Ions by Bean Plants

A B S T R A C T Phosphate uptake above pH 6.0 followed the concentration of H-PO4. Sulfate studies were used to aid evaluation of phosphate data. Phosphate absorption was nearly linearly proportional to transpiration at pH 4.0; at pH 8.7, phosphate absorption occurred only early in the experiments. It was inferred that phosphate entered as H2PO4; that which entered at pH 8.7 did so as the result of a depressed pH at the absorption sites.