Abstract
A field experiment was conducted from September 2010 to July 2011 at Research Station Farm of Higher Institute of Agronomy, Chott Mariem, Sousse (Tunisia) in order to evaluate the performance of seven onion varieties: ‘GIZA 6’, ‘Red Amposta’, ‘Z6’, ‘Morada de Amposta’, ‘Yellow Dessex’, ‘Early Yellow Texas Grano 502’ and ‘Keep Red’ against the commonly grown variety ‘Blanc Hâtif de Paris’ under field conditions. The experiment was conducted in a randomized complete block design with three replications. Results obtained showed that onion varieties were significantly different when it comes to the plant and bulb morphological characteristics. Variety ‘Morada de Amposta’ recorded the highest leaf length (68.06 cm), pseudostem diameter (8.63 cm), number of leaves (8.71), plant height (76.95 cm), in addition to the greatest yields (32.88 t/ha) which were significantly (p≤0.05) increased by respectively 66.2, 88.8, 2.1, 61.2, 63, 27.9 and 28.4% compared to those obtained from the regular variety ‘Blanc Hâtif de Paris’. Variety ‘Blanc Hâtif de Paris’ was the earliest to maturity and recorded the most preferment bulb weight (155.02 g) and diameter (8.21 cm). ‘Keep Red’ variety had the highest height of the bulb (7.19 cm). Variety ‘Z6’ recorded the minimum data in all measured parameters.
Highlights
Onion (Allium cepa L.) is an important worldwide vegetable crop (Best, 2000) which belongs to the family of Liliaceae
The morphological characteristics of the eight varieties of onion cultivated under Tunisian climatic conditions concerned foliage and bulb and are presented in Tab. 1 and Tab. 2
The foliage postions was erect for BHP and Grano 502’ (G502) cv., semi-erect for ‘YD’, ‘RA’ and ‘KR’ cv. and erect to semi-erect for ‘Z6’, ‘MA’, and ‘G6’ cv
Summary
Onion (Allium cepa L.) is an important worldwide vegetable crop (Best, 2000) which belongs to the family of Liliaceae. It is divised into three groups: Allium cepa, Allium aggregattum, Allium prolilum, which are all diploids (2n = 2x = 16) (Boukary et al, 2012 a). Tunisians appreciate onion for its distinctive flavor and it is considered as the most important crop in all condiments. It is daily used at immature and mature stage in salads, cooked or eaten raw as a vegetable. In Tunisia, the culture of onion is important and the country was classified in 2012 at the 7th world rank with a production of 228600 MT (FAO STAT, 2012)
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