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When several clones of tea were grown in neighbouring plots, the xylem water potential was lowest in clones which gave a higher yield. It is unlikely that differences of transpiration rate are involved. Although the physiological link between yield and water potential is still obscure, measurements of potential with a pressure chamber might be used to screen new clones for high productivity at an early stage of growth.
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G. R. Squire (1976) studied this question.
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