Abstract
A study on the influence of different forms of N fertilization on alkaloid concentration of fluecured tobacco (Nicotiana tabacum L.) was carried out for three consecutive years in Portugal. The three N fertilization treatments were 100% NO3-, 50% NO3- + 50% NH4+, and 100% NH4+ each applied at the rate of 45 kg N ha-1. In order to prevent the formation of nitrosamines, the tobacco leaves were treated with antioxidants. Before harvesting, the leaves were individually sprayed with solutions containing different proportions of ascorbic acid and ?-tocopherol. The determination of individual alkaloids (nicotine, nornicotine, anabasine, anatabine, and 2,3’- bipyridyl) on the treated leaves, after cure, was done by a High Resolution Gas Chromatography method. There was no significance between the N fertilization treatments and concentrations of alkaloids. On the other hand, tobacco leaves sprayed with ascorbic acid solutions before cure, had lower alkaloid contents, thus possibly preventing nitrosamine formation.
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Claims 3
Claim · model-written summary
Alkaloid concentrations did not differ significantly among N fertilization treatments.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- N fertilization treatmentse0
- Outcome
- concentrations of alkaloidse0
- Comparator
- N fertilization treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco”
e0“There was no significance between the N fertilization treatments and concentrations of alkaloids.”
Claim · model-written summary
Ascorbic acid sprays before curing lowered tobacco leaf alkaloid contents.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- leavese0
- Treatment
- ascorbic acid solutionse0
- Outcome
- alkaloid contentse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tobacco leaves sprayed with ascorbic acid solutions before cure, had lower alkaloid contents, thus possibly preventing nitrosamine formation.”
Claim · model-written summary
The authors suggest lower alkaloids might prevent nitrosamine formation.
- Taxon
- tobaccoNicotiana tabacume0
- Compound
- ascorbic acide0
- Outcome
- nitrosamine formatione0
- Qualifier
- possiblye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tobacco leaves sprayed with ascorbic acid solutions before cure, had lower alkaloid contents, thus possibly preventing nitrosamine formation.”
The same questions in other papers
fertilization · quality: phytochemicals · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 36 reporting no difference from an alternative
- positive
- positive
- positive
34 papers more in this group
See all 38 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.