The Measurement of Sap Tension in the Petioles of Apple, Raspberry and Black Currant Leaves

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Abstract
The pressure chamber technique has been used for rapid measurement of sap tension in the petioles of apple, raspberry and blackcurrant leaves in the field. When the soil moisture tension was relatively low, the diurnal trend in sap tension in the petioles of apple leaves followed very closely the relative evaporation rate.