Supplementary material to "How do roots interact with layered soils?"

<div>Supplementary material to "Kemp, N., Angelidakis, V., Luli, S., Nadimi, S. (2021). <i>How do roots interact with layered soils?</i>" This document reports geotechnical data from image processing of 30 images, emerging from CT scans of 2 soil-root samples A and B, for 5 stages of root growth corresponding to 1,4,8,11 and 15 days after germination and for 3 machine learning-based classifiers used for image segmentation, trained using 5%, 10% and 20% of the total number of images. Both samples feature layered soil, made of clay, silt, sand and gravel (Sample A: gravelly top layer - Sample B: clayey top layer). Values of void ratio and root volume ratio versus elevation are provided, considering regions of interest of various sizes.<br></div>