The minirhizotron system is designed to slide down inside a transparent tube in the ground and to take pictures of roots belowgound. It allows us to observe root growth over time and trace single roots in the course of their development. Within one tube images are taken at 5 cm intervals every two weeks. The acquired images are subsequently analysed using Rootfly©. Rootfly© provides us with information about root length and diameters of each single image.