Abstract
In this study, we sought to elucidate how under-and over-application of fertilizers, which results often from erroneous calculation of the amount of fertilizer applied, affects tobacco seedling growth. Specifically, the effect of application of different amounts of nitrogen on the growth and physiological characteristics of seedlings of flue-cured tobacco K326 was investigated. Nitrogen treatment was done at four levels: 6 mg/plant (T 1 ), 11 mg/plant (T 2 ), 16 mg/plant (T 3 ), and 21 mg/plant (T 4 ). The root activity, enzyme activity, chlorophyll, photosynthetic performance, and root morphology were measured at 39, 45, 51, 57, and 63 days after seeding. Root activity exhibited a declining trend with increase in the amount of nitrogen applied at the late growth stage of tobacco seeding. Root activity decreased from 115.24 g g -1 h -1 (T 1 ) to 109.65 g g -1 h -1 (T 2 ), then to 85.07 g g -1 h -1 (T 3 ), and finally to 76.86 g g -1 h -1 (T 4 ) at 63 days after seeding. Moreover, nitrogen application also significantly increased the activity of resistance-related peroxidase, polyphenol oxidase, and phenylalanine, and enhanced the resistance of tobacco seedlings to pathogens. Applying the appropriate amount of nitrogen (6-11 mg/plant) could significantly increase the photosynthetic rate of tobacco seedling leaves, intercellular CO 2 content, transpiration rate, and water use efficiency. The amount of nitrogen most suitable for growth of tobacco seedlings with strong roots and resistance on a floating bed was 6-11 mg/plant.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Root activity declined as nitrogen increased at late seedling growth.
- Taxon
- tobacco
Nicotiana tabacume0 - Organ / stage
- late growth stagee0
- Treatment
- amount of nitrogen appliede0
- Outcome
- Root activitye0
- Direction
- declininge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity exhibited a declining trend with increase in the amount of nitrogen applied at the late growth stage of tobacco seeding.”
Claim · model-written summary
At day 63, root activity was 115.24 g g -1 h -1 at T 1.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- 63 days after seedinge0
- Treatment
- T 1e0
- Outcome
- Root activitye0
- Value
- 115.24 g g -1 h -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity decreased from 115.24 g g -1 h -1 (T 1 ) to 109.65 g g -1 h -1 (T 2 ), then to 85.07 g g -1 h -1 (T 3 ), and finally to 76.86 g g -1 h -1 (T 4 ) at 63 days after seeding.”
t0“tobacco”
Claim · model-written summary
At day 63, root activity was 109.65 g g -1 h -1 at T 2.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- 63 days after seedinge0
- Treatment
- T 2e0
- Outcome
- Root activitye0
- Value
- 109.65 g g -1 h -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity decreased from 115.24 g g -1 h -1 (T 1 ) to 109.65 g g -1 h -1 (T 2 ), then to 85.07 g g -1 h -1 (T 3 ), and finally to 76.86 g g -1 h -1 (T 4 ) at 63 days after seeding.”
t0“tobacco”
Claim · model-written summary
At day 63, root activity was 85.07 g g -1 h -1 at T 3.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- 63 days after seedinge0
- Treatment
- T 3e0
- Outcome
- Root activitye0
- Value
- 85.07 g g -1 h -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity decreased from 115.24 g g -1 h -1 (T 1 ) to 109.65 g g -1 h -1 (T 2 ), then to 85.07 g g -1 h -1 (T 3 ), and finally to 76.86 g g -1 h -1 (T 4 ) at 63 days after seeding.”
t0“tobacco”
Claim · model-written summary
At day 63, root activity was 76.86 g g -1 h -1 at T 4.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- 63 days after seedinge0
- Treatment
- T 4e0
- Outcome
- Root activitye0
- Value
- 76.86 g g -1 h -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity decreased from 115.24 g g -1 h -1 (T 1 ) to 109.65 g g -1 h -1 (T 2 ), then to 85.07 g g -1 h -1 (T 3 ), and finally to 76.86 g g -1 h -1 (T 4 ) at 63 days after seeding.”
t0“tobacco”
Claim · model-written summary
Nitrogen increased resistance-related enzyme activities.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- nitrogen applicatione0
- Outcome
- activity of resistance-related peroxidase, polyphenol oxidase, and phenylalaninee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen application also significantly increased the activity of resistance-related peroxidase, polyphenol oxidase, and phenylalanine”
t0“tobacco”
Claim · model-written summary
Nitrogen enhanced seedling resistance to pathogens.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- nitrogen applicatione0
- Outcome
- resistance of tobacco seedlings to pathogense0
- Direction
- enhancede0
Not reportedInteractorInteractor roleComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen application also significantly increased the activity of resistance-related peroxidase, polyphenol oxidase, and phenylalanine, and enhanced the resistance of tobacco seedlings to pathogens.”
Claim · model-written summary
Applying 6-11 mg/plant nitrogen increased leaf photosynthetic rate and intercellular CO 2 content.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- nitrogen (6-11 mg/plant)e0
- Outcome
- photosynthetic rate of tobacco seedling leaves, intercellular CO 2 contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying the appropriate amount of nitrogen (6-11 mg/plant) could significantly increase the photosynthetic rate of tobacco seedling leaves, intercellular CO 2 content, transpiration rate, and water use efficiency.”
Claim · model-written summary
Applying 6-11 mg/plant nitrogen increased transpiration and water use efficiency.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- nitrogen (6-11 mg/plant)e0
- Outcome
- transpiration rate, and water use efficiencye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying the appropriate amount of nitrogen (6-11 mg/plant) could significantly increase the photosynthetic rate of tobacco seedling leaves, intercellular CO 2 content, transpiration rate, and water use efficiency.”
Claim · model-written summary
The authors recommend 6-11 mg/plant nitrogen for strong roots and resistance in floating-bed tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- growth of tobacco seedlings with strong roots and resistancee0
- Value
- 6-11 mg/plante0
- Setting
- floating bede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of nitrogen most suitable for growth of tobacco seedlings with strong roots and resistance on a floating bed was 6-11 mg/plant.”
The same questions in other papers
nitrogen · physiology: gas exchange · Nicotiana tabacum (tobacco)Positive and negative results
2 in the opposite direction
- negative
- negative
nitrogen · physiology: antioxidant enzymes · Nicotiana tabacum (tobacco)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
2 papers more in this group
See all 6 papers →nitrogen · disease · Nicotiana tabacum (tobacco)Positive and negative results
6 papers in the same direction as this paper · 6 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
10 papers more in this group
See all 14 papers →nitrogen · physiology: photosynthesis · Nicotiana tabacum (tobacco)Positive and negative results
13 papers in the same direction as this paper · 9 in the opposite direction
- negative
- no effect
- negative
19 papers more in this group
See all 23 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.