seeds in the country. Abdalla (1969

seeds in the country. Abdalla (1969) revealed that onion seed yield
obtained in Sudan was comparable to onion seed obtained elsewhere
in the world. Statistical data about areas or yields of onion
seeds in Sudan are not available. Mohamedali and Nourai (1988)
reported that an average onion seed yield of more than 600 kg
per ha (250 kg/feddan) is normally produced by Northern Region
farmers due to a relatively cool, dry and long winter season.
In Sudan onion seed research started earlier in the mid-sixties
and noticeable early efforts have been done by some scientists
(Nourai, 1984), but many important research areas still need
further investigation and thorough studies. Water deficit is a major
limiting factor of crop production under continental climates and
there is a continuous demand for genetically new drought-resistant
crops and vegetables (Csiszár et al., 2007). Onions are considered a
shallow-rooted crop and have been reported to have little tolerance
for water stress (Shock et al., 1998). Onion is sensitive to water
stress and requires frequent and light irrigation to avoid water
deficiency and to adequately recharge the plant root zone (Koriem
et al., 1994). The best yield of onion occur when soil was constantly
moist and irrigation should cease 2 weeks before harvest to prevent

Results (English) 1:

在该国的种子。阿卜杜拉（1969）显示，洋葱种子产量
获得苏丹与洋葱种子
在世界其他地方获得的。关于区域或洋葱种子
苏丹的产量统计数据不可用。公司和nourai（1988）
报道，超过600公斤，每公顷平均
洋葱种子产量（250公斤/费丹）通常是由北方地区
由于相对凉爽的农民，干燥和长的冬季。
苏丹洋葱种子的研究早在60年代中期
和明显的早期的努力已经被一些科学家
做（nourai，1984），但许多重要的研究领域还需要进一步调查和深入研究
。水赤字是一个重大的
大陆性气候和
下限制作物产量的因素有一种转基因抗旱新
庄稼和蔬菜连续需求（csiszáR等人。，2007）。洋葱是一种
浅根作物与已报道的有点包容
水应力（休克等人。，1998）。洋葱是水
胁迫敏感，需要频繁和灌溉水
避免光缺乏充分的补给植物根区（koriem
等人。，1994）。最好的洋葱产量的不断
发生时，土壤湿润灌溉应停止前2周的收获来防止