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Evaluation of a Dual‐Radioisotope Instrument for Measuring Leaf Conductance and Photosynthesis 1
Author(s) -
Ramos C.,
Hoffman G. J.,
Hall A. E.
Publication year - 1982
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/agronj1982.00021962007400040027x
Subject(s) - photosynthesis , hordeum vulgare , stomatal conductance , agronomy , conductance , field experiment , zea mays , chemistry , environmental science , poaceae , botany , physics , biology , condensed matter physics
Modifications in both the design and operation of the dual‐radioisotope instrument are described. The accuracy and reliability of the modified instrument were then evaluated in both laboratory and field tests. Leaf conductance and net CO 2 exchange rates determined with this instrument and by gas exchange methods in the laboratory were similar for both corn ( Zea mays L.) and wheat ( Tritictim aestivum L.). A field test of the instrument on barley ( Hordeum vulgare L.) subjected to two levels of salinity gave coefficients of variation which indicated that errors attributable to the instrument and/or the plant material were less than 35% for leaf conductance and 16% for photosynthesis. The instrument provides rapid, simultaneous measurements of leaf conductance and photosynthesis under field conditions.