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What are mega-environments


A mega-environment (ME) is defined as a group of environments that share the same (type of) winning varieties. A meaningful ME should be a group of locations that consistently share the same (or similar) winning varieties. Therefore, data from multiple years for the same set of genotypes are ideal to arrive at a decisive conclusion whether the environments can be divided into mega-environments; data from a single year are only suggestive about the existence of different ME.


Also read: Mega-environment vs. which-won-where