Resumen

ZARZA SILVA¹, Hugo Alberto; ENCISO GARAY², Cipriano Ramón  y  GONZALEZ FERREIRA², Fátima Natalia. Morphological and qualitative characteristics of onion varieties in three transplanting dates. Investig. Agrar. [online]. 2015, vol.17, n.1, pp.36-45. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2015.junio.36-45.

Different transplanting dates and their effects on the morphological and qualitative characteristics of onions varieties were evaluated in Caacupé, Paraguay in 2012. The 17 varieties (Valencianita Precoz, Victoria, Catarina, Yellow Grain, Caeté, Bahía Periforme, Lola, Dourada, Rainha, Aurora, Cascata, Alvorada, Primavera, Red Creole, Montana, Salto Grande and Bella Dura), were transplanted in three different dates, 24/05/12, 26/06/12 and 06/08/12. The experimental design was a split-plot (17 x 3), where the main plots were the cultivars and subplots were the dates of transplantation, distributed in a randomized complete block design with three replications. Data were subjected to analysis of variance and means compared by Tukey test at 5% probability. There were significant interaction between onion varieties and transplanting dates, demonstrating that varieties behave differently on different transplanting dates. The highest average number of leaves per plant, bulb diameter, percentage of commercial bulbs and neck diameter were obtained in the first date, while the highest percentage of curate onion weight  in the second date. Red Creole bulbs presented larger diameter in the three transplanting dates. In the first transplanting date Aurora and Victoria also showed higher bulb diameters, in the second date Yellow Grain and in the last period Aurora, Rainha, Dourada, Caete, Yellow Grain, Catarina, Victoria, Bella Dura and Valencianita. The Lola variety had the highest percentage of commercial bulbs (98.42%) in the first date, Yellow Bean (96.70%) in the second date and Red Creole (93.78%) in the last date of transplantation

Palabras clave : Allium cepa L.; transplanting dates; photoperiod; varieties.

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