Phosphate uptake abovepH 6.0 followed the concentration of H2PO4. Sulfate studies were used to aid evaluation of phosphate data. Phosphate absorption was nearly linearly proportional to transpiration atpH 4.0; atpH 8.7, phosphate absorption occurred only early in the experiments. It was inferred that phosphate entered as H2PO4; that which entered atpH 8.7 did so as the result of a depressedpH at the absorption sites.