Abstract
The effects of different levels of applied nitrogen, times of application of nitrogen and watering regimes on the nitrogen concentration of tobacco leaves, were studied in a series of glasshouse experiments. Time of nitrogen application was also studied in the field. Increasing the nitrogen supply increased dry weight and area of leaves but did not produce an increase in nitrogen concentration of leaves especially in the middle plant position. A significant increase in nitrogen concentration of leaves in the middle plant position was achieved by either split application of nitrogen or by imposing a regular watering stress during growth. The restricted watering treatment also reduced dry weight and area of leaves. Relatively high concentrations of nitrogen in the upper leaves resulted from late application of nitrogen and an experiment using labelled nitrogen confirmed that most late applied nitrogen was incorporated into upper leaves. Changes in leaf nitrogen concentration from time of removal of the inflorescence to final harvest are shown. A field experiment confirmed the glasshouse findings on time of nitrogen application and permitted cured leaf quality assessments to be made. Best leaf quality was produced by split application of nitrogen
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Claims 9
Claim · model-written summary
Increasing the nitrogen supply increased dry weight and area of tobacco leaves.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- Increasing the nitrogen supplye2
- Outcome
- dry weight and area of leavese2
- Direction
- increasede2
- Setting
- glasshouse experimentse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e1“The effects of different levels of applied nitrogen, times of application of nitrogen and watering regimes on the nitrogen concentration of tobacco leaves, were studied in a series of glasshouse experiments”
e2“Increasing the nitrogen supply increased dry weight and area of leaves but did not produce an increase in nitrogen concentration of leaves especially in the middle plant position”
Claim · model-written summary
Increasing the nitrogen supply did not increase nitrogen concentration of tobacco leaves, especially in the middle plant position.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- middle plant positione2
- Treatment
- Increasing the nitrogen supplye2
- Outcome
- nitrogen concentration of leavese2
- Direction
- did not produce an increasee2
- Setting
- glasshouse experimentse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e1“The effects of different levels of applied nitrogen, times of application of nitrogen and watering regimes on the nitrogen concentration of tobacco leaves, were studied in a series of glasshouse experiments”
e2“Increasing the nitrogen supply increased dry weight and area of leaves but did not produce an increase in nitrogen concentration of leaves especially in the middle plant position”
Claim · model-written summary
Split application of nitrogen significantly increased nitrogen concentration of tobacco leaves in the middle plant position.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- middle plant positione3
- Treatment
- split application of nitrogene3
- Outcome
- nitrogen concentration of leavese3
- Direction
- increasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e3“A significant increase in nitrogen concentration of leaves in the middle plant position was achieved by either split application of nitrogen or by imposing a regular watering stress during growth”
Claim · model-written summary
A regular watering stress during growth significantly increased nitrogen concentration of tobacco leaves in the middle plant position.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- middle plant positione3
- Treatment
- imposing a regular watering stress during growthe3
- Outcome
- nitrogen concentration of leavese3
- Direction
- increasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e3“A significant increase in nitrogen concentration of leaves in the middle plant position was achieved by either split application of nitrogen or by imposing a regular watering stress during growth”
Claim · model-written summary
The restricted watering treatment reduced dry weight and area of tobacco leaves.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- restricted watering treatmente4
- Outcome
- dry weight and area of leavese4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e4“The restricted watering treatment also reduced dry weight and area of leaves”
Claim · model-written summary
Late application of nitrogen gave relatively high nitrogen concentrations in the upper leaves of tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- upper leavese5
- Treatment
- late application of nitrogene5
- Outcome
- concentrations of nitrogen in the upper leavese5
- Direction
- Relatively highe5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e5“Relatively high concentrations of nitrogen in the upper leaves resulted from late application of nitrogen and an experiment using labelled nitrogen confirmed that most late applied nitrogen was incorporated into upper leaves”
Claim · model-written summary
Most late applied nitrogen was incorporated into upper tobacco leaves in a labelled nitrogen experiment.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- late applied nitrogene5
- Outcome
- incorporated into upper leavese5
- Qualifier
- an experiment using labelled nitrogene5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e5“Relatively high concentrations of nitrogen in the upper leaves resulted from late application of nitrogen and an experiment using labelled nitrogen confirmed that most late applied nitrogen was incorporated into upper leaves”
Claim · model-written summary
Leaf nitrogen concentration of tobacco changed from removal of the inflorescence to final harvest.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- Changes in leaf nitrogen concentratione6
- Qualifier
- from time of removal of the inflorescence to final harveste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e6“Changes in leaf nitrogen concentration from time of removal of the inflorescence to final harvest are shown”
Claim · model-written summary
Split application of nitrogen produced the best cured leaf quality of tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- split application of nitrogene7
- Outcome
- Best leaf qualitye7
- Direction
- Beste7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco leaves”
e7“Best leaf quality was produced by split application of nitrogen”
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