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Agronomy Journal 93:1341-1343 (2001)
© 2001 American Society of Agronomy

NOTES AND UNIQUE PHENOMENA

The Relationship between Leaf Water Potential and Stem Diameter in Sorghum

Kamal G. Yatapanage* and Hwat Bing So

School of Land and Food Sci., Univ. of Queensland, St. Lucia, QLD 4072, Australia

* Corresponding author (k.yatapanage{at}mailbox.uq.edu.au)

Received for publication June 8, 2000. Leaf water potential ({psi}l) represents a good indicator of the water status of plants, and continuous monitoring of it can be useful in research and field applications such as scheduling irrigation. Changes in stem diameter (Sd) were used for monitoring {psi}l of pot-grown sorghum [Sorghum bicolor (L.) Moench] plants in a glasshouse. This method requires occasional calibration of Sd values against {psi}l. Predicted values of {psi}l based on a single calibration show a good correlation with measured {psi}l values over a period of 13 d before and after the calibration. The correlation can further be improved with shorter time intervals.

Abbreviations: Sd, stem diameter • {psi}l, leaf water potential • {psi}p, phloem water potential






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Copyright © 2001 by the American Society of Agronomy.