Dry Matter Production and Photosynthesis of Hordeum vulgare L. In the Field

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Abstract
The dry matter production, leaf area and net CO2 exchange of a barley crop was measured during winter and spring for 2 yr at Tokyo [Japan]. Dry matter production was < 2 g m-2 day-1 in winter but was up to 20 g m-2 day-1 in spring. Photosynthetic rates for given light flux densities were linearly related to leaf area index except on cold days when photosynthetic rates were suppressed. Temperatures below 0.degree. C at night reduced the subsequent daily net photosynthesis by about 20%. Dark respiration rate increased with increase in temperature. Dark respiration was 5-20% of daily net photosynthesis, except in May when higher percentages of dark respiration were found.

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