Respuesta de cultivares de girasol a la densidad de población en dos ambientes.
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artículo original
Autores
Ortegón, Alfredo S.
Díaz Franco, Arturo
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Universidad de Costa Rica
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Se evaluaron dos híbridos de girasol (Dekalb G-100 y G101) y dos variedades de polinización libre (Rib-77 y Victoria), en tres densidades de población (31.250, 41.660 y 62.500 plantas/ha. El objetivo fue determinar diferencias entre cultivares en dos ciclos de siembra sujetos a las condiciones climáticas del norte del estado de Tamaulipas, México. En 1994 la siembra se estableció en el ciclo considerado como de ‘tardío’ y en 1995 se estableció una segunda siembra en ciclo ‘temprano’. En ambos ciclos se utilizó un diseño de parcelas divididas en una distribución de bloques al azar con cuatro repeticiones; la parcela mayor correspondió a los cultivares y la parcela menor a las densidades de población. Resultados obtenidos en el ciclo de tardío mostraron un rendimiento de grano promedio de 1.678 kg/ha y en el ciclo de temprano de 2.170 kg/ha, lo cual se manifestó en la significación de la interacción ciclos x cultivares. Los híbridos y la variedad Rib-77 fueron iguales estadísticamente en cada ciclo en el rendimiento de grano. En el contenido de aceite, los híbridos superaron a las variedades. Entre densidades se mantuvo la relación de a menor densidad de población mayor peso de grano por capítulo, mayor diámetro de tallo y de capítulo y en el peso de 100 semillas.
Two hybrids of sunflower (Dekalb G-100 G101) and two varieties of free pollination (Rib-77 and Victoria), in three densities of population (31.250, 41.660 62,500 plants/ha) were evaluated. The objective was to determine differences among varieties under climatic conditions of the northern Tamaulipas, Mexico. In 1994 the plantation was established in a cycle considered as “late”; in 1995 a second plantation was established in a cycle considered as “late”. It was used a divided block design in a randomized block distribution with four repetitions. The greater plot corresponded to the cultivars and the minor parcel to the densities of population. Results obtained in the “late” cycle showed a grain yield average of 1.678 kg/ha and in the “early” cycle of 2.170 kg/ha, these results were consistent with the cycles x cultivars interaction. Hybrids and Rib-77 variety were statistically equal in each cycle for grain yield. Hybrids overcame cultivars in oil content. For the densities it was found that for a lower density population produced a higher grain weight, stem diameter, and weight of 100 seeds.
Two hybrids of sunflower (Dekalb G-100 G101) and two varieties of free pollination (Rib-77 and Victoria), in three densities of population (31.250, 41.660 62,500 plants/ha) were evaluated. The objective was to determine differences among varieties under climatic conditions of the northern Tamaulipas, Mexico. In 1994 the plantation was established in a cycle considered as “late”; in 1995 a second plantation was established in a cycle considered as “late”. It was used a divided block design in a randomized block distribution with four repetitions. The greater plot corresponded to the cultivars and the minor parcel to the densities of population. Results obtained in the “late” cycle showed a grain yield average of 1.678 kg/ha and in the “early” cycle of 2.170 kg/ha, these results were consistent with the cycles x cultivars interaction. Hybrids and Rib-77 variety were statistically equal in each cycle for grain yield. Hybrids overcame cultivars in oil content. For the densities it was found that for a lower density population produced a higher grain weight, stem diameter, and weight of 100 seeds.