PATTERN IN INTERACTION IN THE MAIZE YIELD TRIAL

In making decisions on the development of varieties and theidentification of certain growing regions, the effects of genotype (G) and genotypeby environment (GxE) are very important. Although the main genotype effect andthe interaction effect should be partitioned, there is still a need for their integrationin the yield, as both simultaneously affect a ranking of the particular genotypewithin a certain environment. The AMMI (Additive Main Effect and MultiplicativeInteraction) analysis, as a hybrid model, provides appropriate partitioning. TheAMMI2 model, capturing 98.4% of the treatment sum of squares, was used, and 12observed environments were classified into three target environments. Hence, outof 15 commercial maize hybrids, used in the trial, the hybrids ZP-677, ZP-570 andZP-732 were selected as carriers of maximum yields in three target environments.In this way, it was shown that even in a relatively small region a narrow adaptationof genotypes can be exploited.