Figure 3

Photograph of a setup for automated long-term experiments. The plants (in this potograph: oat, lat. Avena) are placed on the table in a circular arrangement similar to the one used by Born et al. [16] to make them accessible to the measurement head (a) on the motorized arm of the goniometer (b). One leaf from each plant is placed in a sample holder (c). Below each pot a digital scale (d) is placed to keep track of the weight of the pots.