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Glossary
Sections:
Introduction
Principles of inheritance
Genotypic variation
Other forms of heritable variation
Quantitative variation and heritability
Novel sources of genetic variation
The practice of plant breeding
Defining breeding goal(s)
Defining breeding goal(s), contd
Identifying relevant sources of genetic variation
Choice of crossing parents
Selection in segregating populations: phenotypic vs genotypic
Multilocation, multiyear testing
Pedigree records
Breeding methods
Plant Breeders' rights
New technologies for plant breeding
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Multilocation, multiyear testing

Multilocation trials are an essential part of plant breeding because of the ubiquity of GxE interactions.

The number of locations is very dependent on seed/planting material availability and the level of resources available.

Locations need to be representative of the environments where a new variety will hopefully be grown.

Multiyear is necessary to assess stability of performance over seasons. In later generations, the size of each plot tends to increase (this improves the reliability of the trial), because planting material availability is increased and the number of entries to be tested falls.