Silver-Foil Psychrometer for Measuring Leaf Water Potential in situ

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Science  01 Sep 1972:
Vol. 177, Issue 4051, pp. 802-804
DOI: 10.1126/science.177.4051.802


The water potential of leaves in situ can be measured without temperature control with a miniature, single-junction psychrometer constructed from silver foil and attached to the leaf with a silver-impregnated, conductive coating. The temperature of the psychrometer has been found to stay within 0.025°C of the temperature of a simulated leaf when the latter temperature was changing at a rate of 1°C per minute. Leaf water potentials can be measured with a precision of ± 1 bar, or better.