At the start of measurements, the CO2 concentration in the air immediately surrounding the plant was350 20 mL L1. All measurements were made from the tip of the youngest fully expanded leaf (usually the third or fourth leaf from the apex).
At the start ofmeasurements, the CO2 concentration in the air immediately surrounding the plant was350 20 mL L1. All measurements were made from the tip of the youngest fullyexpanded leaf (usually the third or fourth leaf from the apex).