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Five winter wheat cultivars were exposed to ambient (A-O3) and elevated (E-O3, 1.5 ambient) O3 in a fully open-air fumigation system in China. Ozone exposure- and flux based response relationships were established for seven physiological variables related to photosynthesis. The performance of the fitting of the regressions in terms of R2 increased when second order regressions instead of first order...
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