Abstract
A field experiment was carried out during the two successive winter seasons of 2020/2021 and 2021/2022 to study the effect of mineral nitrogen levels and plant density on dry weight, yield and its components, as well as bulb quality of onions (cv. ‘Ahmar Tanawy’). This experiment included 12 treatments, which were combinations between four levels of mineral nitrogen (0, 192, 240 and 288 kg N/ha) and three plant densities (4, 5 and 6 rows/ridge equal 33.33, 41.67 and 50 plants/m2, respectively). These treatments were arranged in a split-plot design with three replications. Nitrogen levels were randomly arranged in the main plots, and plant densities were randomly distributed in the subplots. Nitrogen application at 192,244 and 288 kg N/ha led to increase dry weight/plant compared to control (zero N) and 288 kg N/ha gave the highest values of dry weight of leaves, dry weight of bulbs, and total dry weight per plant at 100 days in both seasons. The increases in total dry weight per plant were about 4.84 and 4.80 g per plant for 192 kg N/ha, 4.76 and 3.87 g per plant for 244 kg N/ha, and 6.86 and 5.74 g per plant for 288 kg N/ha over the control at 100 days in the 1st and 2nd seasons, respectively. The interaction between N at 288 kg/ha and low plant density (4 rows/ridge) gave the highest values of dry weight of leaves, bulb, and total dry weight/plant and increased yield of grade 1, exportable yield, average bulb weight, as well as nitrate and sulphur contents in bulbs, whereas the interaction between N at 244 kg/ha and high plant density (6 rows/ridge) increased grades 2, 3, and 4, marketable yield, and total yield/ha.
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Claims 12
Claim · model-written summary
192 kg N/ha increased onion dry weight per plant versus zero nitrogen.
- Taxon
- onion plant
Allium cepat0 - Treatment
- 192e0
- Outcome
- dry weight/plante0
- Direction
- increasee0
- Comparator
- control (zero N)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen application at 192,244 and 288 kg N/ha led to increase dry weight/plant compared to control (zero N)”
t0“onion plant”
Claim · model-written summary
244 kg N/ha increased onion dry weight per plant versus zero nitrogen.
- Taxon
- onion plantAllium cepat0
- Treatment
- 244e0
- Outcome
- dry weight/plante0
- Direction
- increasee0
- Comparator
- control (zero N)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen application at 192,244 and 288 kg N/ha led to increase dry weight/plant compared to control (zero N)”
t0“onion plant”
Claim · model-written summary
288 kg N/ha increased onion dry weight per plant versus zero nitrogen.
- Taxon
- onion plantAllium cepat0
- Treatment
- 288 kg N/hae0
- Outcome
- dry weight/plante0
- Direction
- increasee0
- Comparator
- control (zero N)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen application at 192,244 and 288 kg N/ha led to increase dry weight/plant compared to control (zero N)”
t0“onion plant”
Claim · model-written summary
The 288 kg N/ha dose produced the highest leaf, bulb and total dry weights at 100 days in both seasons.
- Taxon
- onion plantAllium cepat0
- Organ / stage
- 100 dayse0
- Treatment
- 288 kg N/hae0
- Outcome
- dry weight of leaves, dry weight of bulbs, and total dry weight per plante0
- Direction
- higheste0
- Qualifier
- in both seasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“288 kg N/ha gave the highest values of dry weight of leaves, dry weight of bulbs, and total dry weight per plant at 100 days in both seasons”
t0“onion plant”
Claim · model-written summary
192 kg N/ha increased total dry weight per plant by 4.84 and 4.80 g per plant across the two seasons relative to control.
- Taxon
- onion plantAllium cepat0
- Treatment
- 192 kg N/hae0
- Outcome
- total dry weight per plante0
- Direction
- increasese0
- Value
- 4.84 and 4.80 g per plante0
- Qualifier
- at 100 days in the 1st and 2nd seasonse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases in total dry weight per plant were about 4.84 and 4.80 g per plant for 192 kg N/ha, 4.76 and 3.87 g per plant for 244 kg N/ha, and 6.86 and 5.74 g per plant for 288 kg N/ha over the control at 100 days in the 1st and 2nd seasons, respectively.”
t0“onion plant”
Claim · model-written summary
244 kg N/ha increased total dry weight per plant by 4.76 and 3.87 g per plant across the two seasons relative to control.
- Taxon
- onion plantAllium cepat0
- Treatment
- 244 kg N/hae0
- Outcome
- total dry weight per plante0
- Direction
- increasese0
- Value
- 4.76 and 3.87 g per plante0
- Qualifier
- at 100 days in the 1st and 2nd seasonse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases in total dry weight per plant were about 4.84 and 4.80 g per plant for 192 kg N/ha, 4.76 and 3.87 g per plant for 244 kg N/ha, and 6.86 and 5.74 g per plant for 288 kg N/ha over the control at 100 days in the 1st and 2nd seasons, respectively.”
t0“onion plant”
Claim · model-written summary
288 kg N/ha increased total dry weight per plant by 6.86 and 5.74 g per plant across the two seasons relative to control.
- Taxon
- onion plantAllium cepat0
- Treatment
- 288 kg N/hae0
- Outcome
- total dry weight per plante0
- Direction
- increasese0
- Value
- 6.86 and 5.74 g per plante0
- Qualifier
- at 100 days in the 1st and 2nd seasonse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases in total dry weight per plant were about 4.84 and 4.80 g per plant for 192 kg N/ha, 4.76 and 3.87 g per plant for 244 kg N/ha, and 6.86 and 5.74 g per plant for 288 kg N/ha over the control at 100 days in the 1st and 2nd seasons, respectively.”
t0“onion plant”
Claim · model-written summary
The 288 kg/ha nitrogen and low density interaction highest dry weight of leaves, bulb, and total dry weight/plant.
- Taxon
- onion plantAllium cepat0
- Treatment
- N at 288 kg/ha and low plant density (4 rows/ridge)e0
- Outcome
- dry weight of leaves, bulb, and total dry weight/plante0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between N at 288 kg/ha and low plant density (4 rows/ridge) gave the highest values of dry weight of leaves, bulb, and total dry weight/plant and increased yield of grade 1, exportable yield, average bulb weight, as well as nitrate and sulphur contents in bulbs”
t0“onion plant”
Claim · model-written summary
The 288 kg/ha nitrogen and low density interaction increased yield of grade 1, exportable yield, average bulb weight.
- Taxon
- onion plantAllium cepat0
- Treatment
- N at 288 kg/ha and low plant density (4 rows/ridge)e0
- Outcome
- yield of grade 1, exportable yield, average bulb weighte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between N at 288 kg/ha and low plant density (4 rows/ridge) gave the highest values of dry weight of leaves, bulb, and total dry weight/plant and increased yield of grade 1, exportable yield, average bulb weight, as well as nitrate and sulphur contents in bulbs”
t0“onion plant”
Claim · model-written summary
The 288 kg/ha nitrogen and low density interaction increased nitrate and sulphur contents in bulbs.
- Taxon
- onion plantAllium cepat0
- Treatment
- N at 288 kg/ha and low plant density (4 rows/ridge)e0
- Outcome
- nitrate and sulphur contents in bulbse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between N at 288 kg/ha and low plant density (4 rows/ridge) gave the highest values of dry weight of leaves, bulb, and total dry weight/plant and increased yield of grade 1, exportable yield, average bulb weight, as well as nitrate and sulphur contents in bulbs”
t0“onion plant”
Claim · model-written summary
The 244 kg/ha nitrogen and high density interaction increased grades 2, 3, and 4.
- Taxon
- onion plantAllium cepat0
- Treatment
- N at 244 kg/ha and high plant density (6 rows/ridge)e0
- Outcome
- grades 2, 3, and 4e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the interaction between N at 244 kg/ha and high plant density (6 rows/ridge) increased grades 2, 3, and 4, marketable yield, and total yield/ha”
t0“onion plant”
Claim · model-written summary
The 244 kg/ha nitrogen and high density interaction increased marketable yield, and total yield/ha.
- Taxon
- onion plantAllium cepat0
- Treatment
- N at 244 kg/ha and high plant density (6 rows/ridge)e0
- Outcome
- marketable yield, and total yield/hae0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the interaction between N at 244 kg/ha and high plant density (6 rows/ridge) increased grades 2, 3, and 4, marketable yield, and total yield/ha”
t0“onion plant”
The same questions in other papers
nitrogen · growth · Allium cepa (onion)Results differ
70 papers in the same direction as this paper · 9 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- no effect
77 papers more in this group
See all 81 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.