Fig. 1.

Experimental sites and methods used in the root phenotyping facility, RadiMax. a The four black squares show units 1, 2, 3 and 4 of the RadiMax facility. The blue squares in units 1, 2 and 3 show the experimental sites with 30 crop rows and the timelines of the four experiments. b The tracer pipes and minirhizotrons were set along the V-shaped bottom in each unit