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New Technique for Measuring the Water Potential of Detached Leaf Samples
Author(s) -
Brown Ray W.
Publication year - 1976
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1976.00021962006800020062x
Subject(s) - hygrometer , thermocouple , environmental science , horticulture , materials science , biology , humidity , physics , meteorology , composite material
Evaporative losses and contamination in sample disks after they are cut from plant leaves often cause errors in measurements of water potential. A new technique for collecting detached leaf disks to measure water potential eliminates most of the errors associated with other methods. The leaf cutter contains a double‐junction Peltier thermocouple psychrometer. When a leaf disk is removed from the plant, it can be sealed immediately against the cavity containing the psychrometer.