Fig. 4

Cuvette temperature and humidity dynamics Air temperature and relative humidity dynamics inside a empty cuvettes or b cuvettes with barley pots installed when varying ambient parameters and cuvette inlet flow. During this experiment temperature and relative humidity in the phytotron chamber, photochemical active radiation (PAR) and cuvette inlet flows were altered. High PAR caused radiative heating inside the cuvettes, which was almost independent from the cuvette inlet flow investigated (10–20 \(\text{l min}^{-1}\)). Plant evaporation increased the relative humidity inside the cuvettes especially when having dry air pumped from the phytotron chamber into the cuvettes. Under the tested conditions the presence of plants in the cuvettes had little to no effect on the temperature dynamics [data is mean of 15 empty cuvettes (a) and 9 plant cuvettes (b)]