Abstract
Onions are among the most important cash crops in developing countries, including Ethiopia. However, its production and productivity are very low, which is associated with inappropriate fertilization and the use of low-yielding varieties. Therefore, the present study was conducted to evaluate the effects of the nitrogen fertilizer rate on the growth, yield, and quality of hybrid onion varieties in northwest Ethiopia. The experiment was conducted at three locations (Koga, Woreta, and Woramit) during the 2021/2022 cropping season under irrigated conditions. The treatments consisted of three hybrid onion varieties (Russet, Jambar, Red Coach) and one open-pollinated onion variety (Bombay Red) and four nitrogen rates (0, 41, 82, and 123 kg ha-1), which were laid out in a randomized complete block design with a factorial arrangement of 4*4 in three replications. The results of the present study revealed that onion growth, yield and quality were influenced by the nitrogen fertilizer rate and onion variety across all locations. Compared with the open pollinated Bombay Red variety, the hybrid varieties (Russet and Jambar) performed well in terms of bulb diameter, bulb weight, total yield, marketable bulb yield, and pungency. Nitrogen fertilizer applied at a rate of 82 kg ha-1 resulted in the highest growth and yield parameters of onion. The Russet and Jambar varieties recorded the highest marketable bulb yields of 26.50 t ha-1 and 24.57 t ha-1, respectively. Onion varieties treated with the highest nitrogen fertilizer dosage of 123 kg ha-1, particularly the Bombay Red variety, exhibited the longest duration to reach maturity. Onion plants supplied with 82 kg ha-1 nitrogen presented the highest marketable bulb yields, with a value of 26.77 t ha-1. Too much nitrogen above 82 kg ha-1 leads to decreased yield; hence, excess nitrogen is lost to the environment. Furthermore, the Jambar and Russet hybrid varieties and the application of 82 kg ha-1 nitrogen fertilizers provided the highest net benefit. The hybrid varieties Jambar and Russet and the application of 82 kg ha-1 nitrogen fertilizer can be recommended for onion production in the study area and areas with similar agroecosystems. Since this study is the first of its kind, considering other hybrid onion varieties and optimizing agronomic practices such as spacing and phosphorus fertilizer are also recommended in future research.
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Claims 11
Claim · model-written summary
Nitrogen rate and onion variety influenced growth, yield and quality across locations.
- Taxon
- onion
Allium cepae0 - Material
- onion varietye0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- growth, yield and qualitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onion growth, yield and quality were influenced by the nitrogen fertilizer rate and onion variety across all locations”
Claim · model-written summary
Russet and Jambar exceeded Bombay Red in bulb diameter, weight and total yield.
Verbatim
e0“Compared with the open pollinated Bombay Red variety, the hybrid varieties (Russet and Jambar) performed well in terms of bulb diameter, bulb weight, total yield, marketable bulb yield, and pungency.”
Claim · model-written summary
Russet and Jambar performed well compared with Bombay Red in marketable yield and pungency.
- Taxon
- onionAllium cepat0
- Material
- Russet and Jambare0
- Outcome
- marketable bulb yield, and pungencye0
- Direction
- performed welle0
- Comparator
- Bombay Rede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“onion (Alluim cepa L.)”
e0“Compared with the open pollinated Bombay Red variety, the hybrid varieties (Russet and Jambar) performed well in terms of bulb diameter, bulb weight, total yield, marketable bulb yield, and pungency.”
Claim · model-written summary
An 82 kg ha-1 nitrogen rate produced the highest onion growth and yield parameters.
- Taxon
- onionAllium cepae0
- Treatment
- Nitrogen fertilizer applied at a rate of 82 kg ha-1e0
- Outcome
- growth and yield parameterse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilizer applied at a rate of 82 kg ha-1 resulted in the highest growth and yield parameters of onion.”
Claim · model-written summary
Russet had marketable bulb yield of 26.50 t ha-1.
- Taxon
- onionAllium cepat0
- Material
- Russete0
- Outcome
- marketable bulb yieldse0
- Direction
- higheste0
- Value
- 26.50 t ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“onion (Alluim cepa L.)”
e0“The Russet and Jambar varieties recorded the highest marketable bulb yields of 26.50 t ha-1 and 24.57 t ha-1, respectively.”
Claim · model-written summary
Jambar had marketable bulb yield of 24.57 t ha-1.
- Taxon
- onionAllium cepat0
- Material
- Jambare0
- Outcome
- marketable bulb yieldse0
- Direction
- higheste0
- Value
- 24.57 t ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“onion (Alluim cepa L.)”
e0“The Russet and Jambar varieties recorded the highest marketable bulb yields of 26.50 t ha-1 and 24.57 t ha-1, respectively.”
Claim · model-written summary
At 123 kg ha-1 nitrogen, particularly Bombay Red onions took longest to mature.
- Taxon
- OnionAllium cepae0
- Material
- Bombay Rede0
- Treatment
- highest nitrogen fertilizer dosage of 123 kg ha-1e0
- Outcome
- duration to reach maturitye0
- Direction
- longeste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion varieties treated with the highest nitrogen fertilizer dosage of 123 kg ha-1, particularly the Bombay Red variety, exhibited the longest duration to reach maturity.”
Claim · model-written summary
Onions supplied 82 kg ha-1 nitrogen had highest marketable yield, 26.77 t ha-1.
- Taxon
- OnionAllium cepae0
- Treatment
- 82 kg ha-1 nitrogene0
- Outcome
- marketable bulb yieldse0
- Direction
- higheste0
- Value
- 26.77 t ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion plants supplied with 82 kg ha-1 nitrogen presented the highest marketable bulb yields, with a value of 26.77 t ha-1.”
Claim · model-written summary
Nitrogen above 82 kg ha-1 decreased yield.
- Taxon
- onionAllium cepat0
- Treatment
- nitrogen above 82 kg ha-1e0
- Outcome
- yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“onion (Alluim cepa L.)”
e0“Too much nitrogen above 82 kg ha-1 leads to decreased yield”
Claim · model-written summary
Jambar and Russet hybrids with 82 kg ha-1 nitrogen gave the highest net benefit.
- Taxon
- onionAllium cepat0
- Material
- Jambar and Russete0
- Treatment
- 82 kg ha-1 nitrogen fertilizerse0
- Outcome
- net benefite0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“onion (Alluim cepa L.)”
e0“the Jambar and Russet hybrid varieties and the application of 82 kg ha-1 nitrogen fertilizers provided the highest net benefit”
Claim · model-written summary
Authors recommend Jambar and Russet with 82 kg ha-1 nitrogen for onion production in similar areas.
- Taxon
- onionAllium cepae0
- Material
- Jambar and Russete0
- Treatment
- 82 kg ha-1 nitrogen fertilizere0
- Outcome
- onion production in the study area and areas with similar agroecosystemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hybrid varieties Jambar and Russet and the application of 82 kg ha-1 nitrogen fertilizer can be recommended for onion production in the study area and areas with similar agroecosystems.”
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