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Evaluation of a dual radio isotope instrument for measuring leaf conductance and photosynthesis






Agronomy Journal 74(4): 709-715

Evaluation of a dual radio isotope instrument for measuring leaf conductance and photosynthesis

Modifications in the design and operation of the dual-radioisotope instrument are described. The accuracy and reliability of the modified instrument were then evaluated in laboratory and field tests. Leaf conductance and net CO2 exchange rates determined with this instrument and by gas exchange methods in the laboratory were similar for corn (Zea mays L.) and wheat (Triticum aestivum L.). A field test of the instrument on barley (Hordeum vulgare L.) subjected to 2 levels of salinity gave coefficients of variation which indicated that errors attributable to the instrument and/or the plant material were < 35% for leaf conductance and 16% for photosynthesis. The instrument provides rapid, simultaneous measurements of leaf conductance and photosynthesis under field conditions.


Accession: 005395088



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