Factor analysis and SREG GGE biplot for the genotype x environment interaction stratification in maize

The objective of this study was to evaluate the use of SREG GGE biplot methodology and factor analysis to stratify, the genotype x environment interaction in maize. Forty-nine early maize hybrids were evaluated in nine environments. The experimental design used was a 7x7 square lattice with two replicates. Each plot consisted of two 5m long rows spaced 0.90m apart. Grain yield data were used to perform the analysis. The results indicated the existence of two mega-environments in the State of Minas Gerais, Brazil, for early maize hybrids. The stratification of the environment by factor analysis was more selective to join the similarity the according with cultivar performance. However, this approach did not identify specific genotype x environment interactions, which is possible through SREG GGE biplot analysis.