Estratificação ambiental e otimização de rede de ensaios de genótipos de soja no cerrado
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Data
2014-10
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Resumo
The objective of this work was to establish a consistent environmental stratification for recommendation
and evaluation of experimental soybean lines and cultivars in the Cerrado region, from the analyses of genotype
by environment interaction (GxE) for grain yield, besides evaluating the current trial network on the value for
cultivation and use (VCU), for its optimization. Data were obtained from 559 competition trials of soybean
lines, performed in 57 locations, during seven harvest periods (2002/2003 to 2008/2009). Joint analyses of
variance were carried out by the AMMI (additive main effects and multiplicative interaction) model, and the
environmental stratification by the related statistical approach of “winning genotypes”. The GxE interaction
was always significant as a result of the genotype differential response to environmental change. Test locations
clustered differently according to maturity groups. Redundancy was observed in 20% of the locations, which
indicates the possibility of optimizing the trial network by the elimination or replacement of these locations.
The target region should receive different stratifications, congenerous to each maturity group, and may be
divided into 22 (early cycle), 23 (medium cycle), and 21 (long cycle) environmental strata.
Descrição
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Glycine max, Análise AMMI, Genótipo vencedor, Interação genótipo x ambiente, Locais-chave, Mega-ambiente, Glycine max, AMMI analysis, Winner genotype, Genotype x environment interaction, Key locations, Mmega-environment
Citação
BRANQUINHO, Rodrigo Gomes et al. Estratificação ambiental e otimização de rede de ensaios de genótipos de soja no cerrado. Pesquisa Agropecuária Brasileira, Brasília, v. 49, n. 10, p. 783-795, out. 2014.