Cross-validated accuracies of prediction for genomic selection using increasing environment numbers (CV
Env). Calculation was done with RR-BLUP across genotype. ES in the scheme at the left refers to the estimation set, TS represents the test set. At the right, the impact of increasing the number of environments used for cross-validation on the accuracy of prediction rp for grain yield and plant height in population A (squares) and population B (triangles).