Abstract            Volume:11  Issue-11  Year-2023         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

The onion is one of the most significant vegetables grown by smallholder farmers in Ethiopia, primarily as a source of cash and flavor. However, Ethiopia's onion yield is low when compared to other countries such as the Republic of Korea, the United States, the Netherlands, Japan, and Egypt. As a result, the objective of this review was to find out the response of onion (Allium cepa L.) to nitrogen fertilizer in various Ethiopian agroecologies. According to the review, almost every onion parameter responded significantly to nitrogen fertilizer. The largest onion yield was obtained from plots treated with the highest nitrogen fertilizer rate, whereas the lowest onion yield was obtained from plots treated with no nitrogen fertilizer rate. Similarly, nitrogen fertilizer levels ranging from 0 to 250 kg/ha boosted onion yield across different agroecologies in Ethiopia. However, this review discovered that the amount of nitrogen applied and onion crop responses to nitrogen varied from place to place and from agroecology to agroecology, and thus blanket fertilizer recommendations are unnecessary in this notion. Thus, determining the appropriate amount of nitrogen fertilizer to apply is critical for limiting the danger of nutrient loss while also increasing yields from crops. This review also found that the experiment should be repeated across locations and seasons, with intra-row spacing and nitrogen rates included when recommending fertilizer. It might be concluded that future fertilizer recommendations should be based on soil test-based studies, crop reactions to fertilizer, and the country's agroecology.

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