2.4 Root hair traits
As a result, of the root hair extraction, we were able to compute traits based on the shape and distribution of individual root hairs as shown in Figure 1. As such, we calculated the length of each individual root hair and the density of root hairs on both sides of the root as the number of root hairs per root edge length. Root hairs that were too short, too far from the root or that emerged from a secondary root were not included into the calculations. We excluded images where the algorithm failed to identify the root edge correctly.