Interaction genotypes x sowing periods in experimental F9:2 soybean lines
Mara Fernandes Moura, José Baldin Pinheiro, Lizz Kezzy de Morais, Nara Fernandes Moura, Ananda Virgínia AguiaR, Lázaro José Chaves, Roland Vencovsky, and Maria Imaculada Zucchi
The magnitude of the interaction G x S was measured by different biometric techniques to draw inferences on improvement strategies for soybean. Twenty-five highly homozygotic (F9:2) soybean lines were evaluated in three sowing periods. The trials were set up in randomized complete blocks with three replications. The controls IAC-100, OCEPAR-4, MTBR-45, and EMGOPA-313 were used. Number of days to flowering and to maturity, grain filling period, stained seeds, weight of a hundred seeds and the grain yield (GY) were evaluated. The complex part was predominant in the partition of this interaction. In relation to the selection gain for GY a mean reduction of 10% is expected in comparison to a selection realized in period 2 only with specific selections per period, admitting a selection intensity of 40%. A reduction of 28% is expected under a selection intensity of 20%. The selection of more generalist genotypes is possible, although it leads to losses in mean terms.