|Authors: ||S.I. El Abas, A.M. Ali, O.E. Mohamed, A.H. Nourai|
|Keywords: ||onion, seed production, nitrogen, spacing, Sudan|
Field experiments were conducted during the winter seasons of 2009/10 and 2010/11 at Dar Mali in River Nile State, Sudan, to study the effects of different levels of nitrogen fertilizer and bulbs spacing on seed production of the red onion 'Saggai Red'. Four in-row spacing (15, 20, 25, and 30 cm) and four fertilization levels (0, 45, 90, and 180) kg N ha-1 were used.
Nitrogen was applied in the form of Urea in four equal doses (10, 30, 50 and 70 days after planting). The result indicted that nitrogen fertilization significantly increased the length of leaves, number of leaves, length of flowering stalk and number of flowers per umbel.
The highest records for the four growth parameters were obtained by 90 kg N fertilization.
The narrow spacing (15 cm) recorded the highest leaves length.
However, the number of leaves per plant as affected by spacing, were not significant.
The longest flowering stalk and The biggest number of flowers per umbel were obtained by 25 cm bulb spacing.
The effects of fertilization and spacing on number of flowering stalk showed no significant difference.
Early flowering was obtained by application of 90 kg N ha-1, and 15 cm bulb spacing.
The highest 1000-seeds weight was recorded by 45 kg N ha-1 and 25 cm bulb spacing.
The maximum yield of seeds ha-1 was obtained by 90 kg N ha-1 and 20 cm bulb spacing.
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