Cultivar and environment vectors
The cultivars and environments can be visualised as vectors from the origin of axis (0, 0) to the end points determined by their scores. The environment scores have the same orientation to the right (same sign). Cultivars that are far from the origin have positive responses with environments that are far from the origin but in the same direction. Ideal cultivars: large PC1 scores (higher mean yield) and PC2 scores near to zero (more stable). Ideal test environments: Large PC1 scores (high capacity to discriminate among cultivars) and PC2 scores near to zero (‘more representative of an average environment’).