Figure 3. Biplots of the first two principal components summarizing variation in a) soil properties and b) plant root morphological attributes, for RS (green), OUS (blue), and DUS (orange) environments. Soil PCA (PCsoil) (a) used recorded information at site level (nsite = 60), while root PCA (PCroot) (b) depicted included information at plant level (nplant= 201).