Contents - Index


Test environment evaluation based on the GGE biplot

 

A GGE biplot allows the test environments to be evaluated from the following perspectives in terms of genotype evaluation:

 

 

The following is not based on biplot but it is also a useful tool for comparing test environments:

 

NOTE: please do not confuse "Test environment evaluation" with "Environment Evaluation". The purpose of "test environment evaluaiton" is to identify environments that are suitable for selecting/evaluating genotypes. Test environment evaluation depends on G+GE and therefore GGE biplots are appropriate. The purpose of "Environment evaluation" is to identify environments that are have high productivity, which is determined by E (the environment main effect).  Some argue that the AMMI analysis is more appropriate because it includes E and separates G from GE. However, these are really pseudo issues to plant breeders and geneticists.