TY - JOUR AU - Sánchez-Hernández, Miguel Ángel AU - Aguilar-Martínez, Cecilio Ubaldo AU - Valenzuela-Jiménez, Nicolás AU - Sánchez-Hernández, César AU - Jiménez-Rojas, María Concepción AU - Villanueva-Verduzco, Clemente PY - 2011/12/01 Y2 - 2024/03/29 TI - Plant density and growth of forage maize genotypes. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 22 IS - 2 SE - Articles DO - 10.15517/am.v22i2.11801 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11801 SP - 281-295 AB - <p>A study was conducted to identify genotypes of maize with</p><p>high forage potential. The fi rst experiment (E<span>1</span>) was conducted</p><p>from November 2007 to February 2008, evaluating the</p><p>genotypes H-520, HE-1A17, HE-2A15, V-556AC, VS-536,</p><p>A7573 and a native variety, at three densities (50000, 62500</p><p>and 83333 plants/ha) and with four replications. In a second</p><p>experiment (E<span>2</span>) (January to April 2009) the hybrids HE-</p><p>1A17 and 2A15 were excluded and H-564C was added.</p><p>The treatments were the combination of genotypes and</p><p>sowing densities, in a randomized block design. Analysis of</p><p>variance for each experiment were conducted, and combined</p><p>and comparison of means, by Tukey (P<span>≤</span>0.05). In the fi rst</p><p>experiment, the native genotype, average of densities, had</p><p>the highest plant height (E<span>1</span>=247, E<span>2</span>=216 cm), total leaf</p><p>area (E<span>1</span>=5834, E<span>2</span>=7516 cm<span>2</span>) and leaf area index (E<span>1</span>=3.8;</p><p>E<span>2</span>=4.9), stem diameter (E<span>1</span>= 6.6; E<span>2</span>=7.5 cm) and forage yield</p><p>(E<span>1</span>=44.3 t/ha). In the second experiment, H-564C (E<span>2</span>=36.6</p><p>t/ha) surpassed the control. The density of 83333 plants/ha,</p><p>average of genotypes, surpassed in forage yield (E<span>1</span>=35.8;</p><p>E<span>2</span>=37.3 t/ha) the density of 62500 plants and 50000 plants/</p><p>ha. For density, the maximum yield by genotype was</p><p>established at 83333 plants/ha in the native variety, which</p><p>produced 57 t/ha of forage. On average of the densities, the</p><p>maximum leaf area index was achieved with 83333 plants/ha,</p><p>and the lowest was obtained with 50000 plants per hectare.</p> ER -