There were observed inaccuracies in the legends of the graphs in Figure 1a-d. A new Figure 1a-d is provided.F I G U R E 1 Estimated reaction norms for yield of 10 yellow diploid potato (Solanum tuberosum Group: Phureja) genotypes evaluated at 11 locations, in two consecutive semesters, with respect to the environmental covariates of (a) precipitation, (b) altitude, (c) pH, and (d) effective cation exchange capacity (CICE).