Abstract
In this paper the values of photosynthetic intensities of spring barley leaves measured by two different methods were compared: The results prove that in most instances both methods afford, from the quantitative point of view, completely corresponding results. As a cause of a few discrepancies met in some experiments, the influence of cutting off of the leaves and uneasily seizable differences in experimental conditions during the exposure of leaves and segments can be considered. Further, the calculated value for the conversion coefficient, i.e. 0·64, must not in every case necessarily correspond to the chemical composition of formed assimilates. The existence of inhibitory influence of accumulated assimilates in leaf segments on the photosynthetic intensity can be excluded. When the CO2 consumption of cut off and non-cut leaves of the same experimental plant was measured, no differences could be observed. The advantages and possibilities of the use of dry matter increment determination in segments as a measure of photosynthetic intensity are discussed.
Published Version
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