Agricultural Research Corporation (ARC) - Sudan
Proceedings of the Meetings of the National Crop Husbandry Committee - NCHC
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Effects of transplanting date, nitrogen nutrition and watering regime on yield, quality
and storage of the red onion
Abdalla Hussein Nourai
Abstract:
Field experiments were conducted for three consecutive seasons (1989-90,
1990-91 and 1991-92) with the objective of evaluating the effects of
three transplanting dates (15 Nov, 15 Dec and 15 Jan), two levels of
nitrogen nutrition (43 and 86 kg N ha-1) and two watering regimes (5 and
10 days) on yield, quality and storage of the red onion variety 'Saggai
Improved'.
The highest total onion yield (25 tons ha-1) was realized in 1989-90
season while the lowest total yield (17 tons ha-1) was recorded in
1990-91 season. This seasonal variations in onion yields were attributed
to the variations of temperatures prevailing during the growing season
where high onion yields were realized in the winter seasons.
High onion yields were realized from early transplanted crop (15 Nov.)
followed by 15 Dec. and then 15 Jan. transplanted onion. Percentage
reductions of 76 and 56 were recorded when the total and marketable
yield averaged over the three seasons of onion transplanted in 15 Jan.
were compared with the total and marketable yield averaged over the
three seasons of onion transplanted in 15 Nov. The high onion yields
realized from early transplanting were associated with an increased bulb
size, increased incidence of doubles and splits and bolters, and an
improved quality and plant stand. However storage losses were higher in
early transplanted onion.
The application of nitrogen fertilizer in the form of urea increased
onion yield in one out of three seasons.
Increases of 7 and 5 tons ha-1 in total and marketable onion yields,
respectively were recorded when onion plants were irrigated every 5 days
as compared to the yields of onion irrigated every 10 days.
Based on the findings of this study and in order to achieve high onion
yields it is recommended that onion could be transplanted during the
period 15 Nov. to 15 Dec.
Proceedings of the Meetings of the National Crop Husbandry Committee 37th (2005) pp. 186-196
Proceedings of the Meetings of the National Crop Husbandry Committee - Sudan
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