Resumo

CARRILLO CRIOLLO, Jairo Fernando  e  YUMBLA-ORBES, María. Caracterización morfológica y análisis de crecimiento de tres cultivares de Helianthus annuus L. para flor de corte. Siembra [online]. 2022, vol.9, n.1, e3323. ISSN 2477-8850.  https://doi.org/10.29166/siembra.v9i1.3323.

The aim of this study was to evaluate the flower morphological characteristics and analyze the growth parameters for cut-flower of three sunflower hybrid cultivars (Helianthus annuus L.), coming from open field cultivation. Hybrid cultivars Vicent Choice, Sunrich Orange and SM-373 were evaluated in a Complete Block Design with four replicates. The cycle of sunflower cultivation was finalized at 40% flower opening, which occurred at 53 days after planting for Vicent Choice, 55 days for Sunrich Orange and 63 days for SM-373. In this study, the three hybrid cultivars stem length average was 87.36 cm. The growth dynamic of the three varieties was adjusted to a quadratic model, in which the stem yielded in average 50.12% of dry matter, and the Vicent Choice hybrid cultivar recorded the highest total dry matter accumulation (42.54g). Flowering was the development stage with highest photosynthetic efficacy, the average foliar area index of the three varieties was 1.33 at 46 days after planting, and Vicent Choice produced 679 exportable stems, representing 70.72% of the study's total production.

Palavras-chave : sunflower; floriculture; summer flowers; growth analysis; growth parameters.

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