GENOTYPE-BY-ENVIRONMENT interactions (GEI)
are ubiquitous for quantitative traits of economic
importance. Significant GEI tends to hinder genetic
progress in a breeding program; in particular, the
crossover type of GEI makes it difficult to unambiguously
select promising materials that perform consistently
better across a wide range of environmental
conditions. The first step to deal with the consequences
of the presence of GEI is to assess its relative
importance through a pooled analysis of data across
the testing sites
