Claim · model-written summary
Fresh bulb yield increased from 0.19 kg plant-1 with no N at bulbing to as much as 0.28 kg plant-1 with 60 kg ha-1 N.
- Taxon
- Allium cepa
Allium cepae2 - Material
- Guimare2
- Treatment
- 60 kg ha-1 Ne3
- Outcome
- Yield (fresh bulb weight)e3
- Direction
- increasede3
- Value
- 0.28 kg plant-1e3
- Qualifier
- from 0.19 kg plant-1e3
- Comparator
- no N at bulbinge3
- Setting
- in the field in southern Portugale2
Not reportedGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor role
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“intermediate-day onion (Allium cepa 'Guimar') was evaluated in the field in southern Portugal”
e3“Yield (fresh bulb weight) increased from 0.19 kg plant-1 with no N at bulbing to as much as 0.28 kg plant-1 with 60 kg ha-1 N”
Title
Nitrogen requirements at bulb initiation for production of intermediate-day onions
R.M.A. Machado; D.R. Bryla Acta Horticulturae 2016. doi:10.17660/actahortic.2016.1142.11
Other claims from this paper (11)
- Intervention effect Nitrogen application did not affect root length density or rooting depth during later stages of bulb development in intermediate-day onion.
- Intervention effect Leaf dry matter increased linearly with N rate during bulb growth (85 DAT) in intermediate-day onion.
- Intervention effect Bulb dry matter increased linearly with N rate at harvest (114 DAT) in intermediate-day onion.
- Intervention effect Soil nitrate-N at 0-0.3 m depth increased linearly with N rate during bulb growth.
- Observation Soil nitrate-N declined from 15-30 mg kg-1 at bulbing to >10 mg kg-1 in each treatment by harvest.
- Observation About 302-525 mg of N in the plants was taken up from the soil by intermediate-day onion.
- Intervention effect Application of 60 kg ha-1 N resulted in luxury consumption of nitrogen by intermediate-day onion.
- Intervention effect Bulbs from plants fertilized with 40-60 kg ha-1 N were larger in diameter (8.2-8.5 cm) than bulbs from plants with no N at bulbing (7.2 cm).
- Recommendation N fertilizer should be applied at bulbing to increase N uptake, yield and bulb size of intermediate-day onions, particularly in dry Mediterranean climates.
- Intervention effect Neck diameter, bulb water content and total soluble solids were not affected by N applied at bulbing.
- Intervention effect Juice pH was not affected by N applied at bulbing.