Abstract
An open system has been designed which enables a simple and rapid manual regulation of the CO2 concentration and absolute humidity in the assimilation chamber according to the actual CO2 and water vapour exchange rates, respectively. This ensures a constant effective CO2 concentration and humidity irrespective of the gas exchange of the leaves. The installation is supplemented with an irradiation system providing irradiance at the leaf level up to 3 200 μeinstein m−2s−1 (400–700 nm),i. e. ca. 675 W m−2.

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