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A Comparison of Thermocouple Psychrometer and Pressure Chamber Measurements of Leaf Water Potential in Peanuts

Published online by Cambridge University Press:  03 October 2008

G. C. Wright ,
A. Rahmianna  and
P. M. Hatfield
G. C. Wright
Affiliation:
Department of Primary Industries, J. Bjelke Petersen Research Station, PO Box 23, Kingaroy Q 4610, Australia
A. Rahmianna
Affiliation:
Malang Research Institute for Food Crops, PO Box 66, Malang, E. Java, Indonesia
P. M. Hatfield
Affiliation:
Department of Primary Industries, J. Bjelke Petersen Research Station, PO Box 23, Kingaroy Q 4610, Australia
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Summary

The pressure chamber method for measuring leaf water potential in peanuts was compared with the thermocouple psychrometer technique. The pressure chamber over-estimated leaf water potential by an average of 0.4 MPa over the range −0.5 to −5.0 MPa. It is suggested that the pressure chamber technique may be appropriate in comparative studies of peanut water stress. However, where absolute measurements are required, as in the calculation of leaf turgor potential, either a correction factor should be applied or, preferably, the thermocouple psychrometer technique used. If no account is taken of the discrepancy between techniques, erroneously large negative turgor potentials will result.

Type
Research Article
Information
Experimental Agriculture , Volume 24 , Issue 3 , July 1988 , pp. 355 - 359
Copyright
Copyright © Cambridge University Press 1988

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References

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