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Objective. To assess the interaction effect of the season and planting densities on the production of eight INIAP corn hybrids. Materials and methods. A research process was conducted in 2013. It was applied a split - split plot design with three replication and Tukey test was used. It was evaluated two planting seasons (28 January and 8 April), they were placed in large plots. Two planting densities (65,500 y 125,000 plants/ha), that were located in the subplots and eight INIAP corn hybrids arranged in the sub- subplots. The evaluated variables were Fresh Matter, Dry Matter, Plant Height and Crude Protein Results. Fresh Matter and Crude Protein productions were influenced by planting seasons. Plant densities affected the production of Fresh Matter, Dry Matter and Plant Height, as well as the interaction season by corn INIAP hybrids. While INIAP corn hybrids showed statistical differences in the production of Fresh, Dry Matter, Plant Height and Crude Protein. The eight INIAP hybrids productions were: Fresh Matter (58.86 ton/ha ±5.19); Dry Matter (21.45 ton/ha ±4.71); Plant Height (2.46 m ±0.16) and Crude Protein (10.6±1.12). Conclusions. The performance showed by hybrids INIAP CML-172, INIAP 6021 and INIAP 551 were very acceptable forage material and could be used for silage purposes. RESUMEN Objetivo. Evaluar el efecto de la interaccion epoca y densidad de siembra en ocho hibridos de maiz para produccion de forraje sobre la obtencion de materia fresca MF, seca MS, altura de planta AP y proteina cruda PC. Materiales y metodos. Se empleo un diseno de parcela dos veces dividida con tres repeticiones. Se evaluo el efecto de dos epocas de siembra (28 de enero y el 8 de abril) que se dispusieron en la parcelas grandes, dos densidades de siembra (65.500 y 125.000 plantas/ha) que se ubicaron en las subparcelas y ocho hibridos de maiz INIAP dispuestas en las sub-subparcelas. Las variables evaluadas fueron produccion de MF, MS, AP y PC. Resultados. La epoca de siembra tuvo su influencia sobre la produccion de MF y contenido de PC. La densidad de cultivo y epoca de siembra afecto la produccion de MF, MS y AP por hibridos de maiz. Mientras que los hibridos INIAP de maiz mostraron diferencias estadisticas (p<0.001) en la produccion de MF, MS, AP y PC. La produccion de los ocho hibridos INIAP fue de MF (58.86 Ton/ha ±5.19); MS (21.45 Ton/ha ±4.71); AP (2.46 m±0.16) y PC (10.6±1.12). Conclusiones. Los rendimientos mostrados por los hibridos INIAP CML 172, INIAP 6021 e INIAP 551 son materiales aceptables con relacion a las variables evaluadas y pueden ser empleados especialmente para ensilaje.

Seasons and planting densities interaction on forage production of eight hybrids maize, Ecuador