HYDROGEN-ION CONCENTRATION AND IRON CONTENT OF TRACHEAL SAP FROM GREEN AND CHLOROTIC PEAR TREES

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Abstract
The concentrations of H+ and Fe in the tracheal sap of pear trees reach a high level at the beginning of the growing season; but the period at which the concentration of Fe is high is shorter than the period of low pH of the tracheal sap. No significant difference exists between the H+ and the Fe concentrations in the extracted tracheal sap of green and chlorotic branches from the same orchard; the concentration of Fe in the tracheal sap from chlorotic trees may be higher than that from green trees. There was no indication that the concentration of Fe was controlled by that of H+.