Genotype x environment (GxE) interaction
The performance of each plant is determined both by its genotype and by the environment in which it is grown. But what about the performance of a given genotype in a number of different environments?
The best performer in one environment (eg var#2 in env#1) may not be the best in another – var#2 is the poorest performer in env#3.
So which is the best variety here? It depends which environment is of most importance.
Because GxE is so common, it is usually better to identify a line which shows a "stable" performance – here, this is var#1, even though it is not the highest yielder in any of the three environments.