Resumo

DE LA CRUZ-LAZARO, E et al. Grain yield of maize genotypes grown at three population densities. Universidad y ciencia [online]. 2009, vol.25, n.1, pp.93-98. ISSN 0186-2979.

The objective of this study was to determine the effect of the population density on the grain yield of nine tropical maize genotypes (Zea mays L.). A study was conducted in 2005 at the experimental station of the Universidad Juárez Autónoma de Tabasco, Centro municipality, Tabasco. A randomized complete block experimental design with four replicates and a split plot arrangement was used. The big plots contained population densities of 44 289, 53 200 and 66 500 plants ha^-1, and the small plot contained population densities of 21, 22, 23, 25, 32, 43, 49, the HS-3G hybrid and the VS-536 variety. Significant differences among densities were recorded only for grain yield (p < 0.01), genotypes for plant height (p < 0.01), ear height (p < 0.01), and days to flowering (p < 0.01). The density of 66 500 plants ha^-1 presented the greatest grain yield (p < 0.05). The interaction between population and density was non significant. The genotypes with the best grain yield were populations 21, 23, 25, 43 and HS-3G.

Palavras-chave : Zea mays L.; populations; days to flowering.

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