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espanolRESUMEN Este estudio determino la temperatura base, el filocrono, la eficiencia del uso de la radiacion solar y el rendimiento de cultivares de okra en cinco temporadas de siembra a una latitud cercana a los 30o S. El experimento se llevo a cabo en el area experimental del Departamento de Produccion Vegetal de la Universidad Federal de Santa Maria durante la temporada agricola 2016/2017. Los tratamientos fueron compuestos por diez combinaciones de dos cultivares de okra (‘Santa Cruz 47’ y ‘Valenca’) y cinco temporadas de siembra (temporada 1 = 04/11/2016, temporada 2 = 19/11/2016, temporada 3 = 04/12/2016, temporada4 = 19/12/2016, y temporada 5 = 03/01/2017). El diseno experimental fue un diseno de bloques al azar en un esquema factorial 5 × 2, con parcelas divididas y cuatro repeticiones. Las cinco temporadas de siembra se asignaron al azar en la parcela principal y los dos cultivares en la subparcela. El espaciamiento fue de 0,8 m entre lineas y 0,40 m entre plantas en la linea. La temperatura base, que se estimo utilizando el menor error cuadratico medio (ECM), presento valores de 11,5 y 11,0 oC para los cultivares ‘Santa Cruz 47’ y ‘Valenca’, respectivamente. El filocrono vario entre las temporadas de siembra de 14,4 a 18,9 oC dia hoja-1 para el cultivar ‘Santa Cruz 47’ y de 18,4 a 25,7 oC dia hoja-1 para el cultivar ‘Valenca’. El cultivar ‘Valenca’ presento una mayor eficiencia en el uso de la radiacion, lo que resulto en un mayor rendimiento de la fruta. EnglishABSTRACT This study aimed to determine the base temperature, phyllochron, solar radiation use efficiency, and productivity of okra cultivars in five sowing seasons at a latitude near 30° S. The experiment was carried out in the experimental area of the Department of Plant Production of the Federal University of Santa Maria during the agricultural season of 2016/2017. Treatments were composed by ten combinations of two okra cultivars (Santa Cruz 47 and Valenca) and five sowing seasons (season 1 = 11/4/2016, season 2 = 11/19/2016, season 3 = 12/4/2016, season 4 = 12/19/2016, and season 5 = 1/3/2017). The experimental design was a randomized block design in a 5 × 2 factorial scheme, with a split-plot arrangement and four replications. The five sowing seasons were randomized in the main plot and the two cultivars in the subplot. Spacing was 0.8 m between rows and 0.40 m between plants in the row. Base temperature, which was estimated using the lower mean-square error (MSE), presented values of 11.5 and 11.0 °C for the cultivars Santa Cruz 47 and Valenca, respectively. Phyllochron ranged between sowing seasons from 14.4 to 18.9 °C day leaf−1 for the cultivar Santa Cruz 47 and 18.4 to 25.7 °C day leaf−1 for the cultivar Valenca. The cultivar Valenca presented a higher radiation use efficiency, resulting in a higher fruit productivity.

Temperatura base, filocrono y eficiencia de uso de radiación de cultivares de okra