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A portable field apparatus for the measurement of photosynthesis is described. Short pulses (20 s) of air containing 14CO2 are applied to circular leaf areas of 1 cm2, enclosed in a transparent miniature chamber; the radioactivity of the leaf areas is measured by liquid scintillation, using a new in-vial wet combustion technique. Typical daily courses of photosynthesis in maize and cotton are presented.
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D. Shimshi (1969) studied this question.
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