Resumo

SANCHEZ-HERNANDEZ, Miguel Ángel et al. Densidad de siembra y crecimiento de maíces forrajeros. Agron. Mesoam [online]. 2011, vol.22, n.2, pp.281-295. ISSN 2215-3608.

Plant density and growth of forage maize genotypes. A study was conducted to identify genotypes of maize with high forage potential. The first experiment (E1) was conducted from November 2007 to February 2008, evaluating the genotypes H-520, HE-1A17, HE-2A15, V-556AC, VS-536, A7573 and a native variety, at three densities (50000, 62500 and 83333 plants/ha) and with four replications. In a second experiment (E2) (January to April 2009) the hybrids HE-1A17 and 2A15 were excluded and H-564C was added. The treatments were the combination of genotypes and sowing densities, in a randomized block design. Analysis of variance for each experiment were conducted, and combined and comparison of means, by Tukey (P≤0.05). In the first experiment, the native genotype, average of densities, had the highest plant height (E1=247, E2=216 cm), total leaf area (E =5834, E =7516 cm2) and leaf area index (E =3.8; E2=4.9), stem diameter (E1= 6.6; E2=7.5 cm) and forage yield (E1=44.3 t/ha). In the second experiment, H-564C (E2=36.6 t/ha) surpassed the control. The density of 83333 plants/ha, average of genotypes, surpassed in forage yield (E1=35.8; E2=37.3 t/ha) the density of 62500 plants and 50000 plants/ ha. For density, the maximum yield by genotype was established at 83333 plants/ha in the native variety, which produced 57 t/ha of forage. On average of the densities, the maximum leaf area index was achieved with 83333 plants/ha, and the lowest was obtained with 50000 plants per hectare.

Palavras-chave : Hybrids; leaf area index.

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