The stability
of soybean genotypes is very important in breeding programs for not only the
evaluation, selection, and productionof cultivars but also the
establishment ofparameters required for the classification of genotypes
into relative maturity groups (RMG). The aim of this study was to define stable
genotypes for traits, such as days to flowering, days to maturity, and length
of the reproductive period, and to classify them into RMG.For this
purpose,20 commercial soybean cultivars were evaluated in 12 environments
distributed in the major producing regions of Brazil. Assessments according to
the Eberhart and Russell method and the additive main effects and
multiplicative interaction (AMMI)methodwere effective in the
identification of stable genotypes and theirclassification intoRMG.These methods
canalso be usedcollectively for this purpose.Our results showed that
theAMMI methodled to a better interpretation of genotype-environment interactions.
Thus, RMGobtained on the basis of stable genotypes represented a good estimate of the
relative maturity of soybean crops throughout Brazil.
*
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