Abstract
The process of biomass, nitrogen (N), and potassium (K) accumulation over time as affected by N forms is poorly understood. The objective of this study was to identify the effects of N form on growth as well as on N and K nutrition of flue‐cured tobacco plants (Nicotiana tobaccum L.). The plants were grown in a greenhouse with pots of soil for 117 days after 200 days of preculture. Three treatments (calcium nitrate [Ca(NO3)2], ammonium nitrate (NH4NO3), and ammonium nitrate plus straw (NH4NO3 + straw)) were used. The results showed that there were no significant differences in shoot dry mass of tobacco among the three treatments during the entire growth stage except at 30 and 117 days after transplanting. At these two growth stages, shoot biomass with the Ca(NO3)2 treatment was significantly less than that with NH4NO3 with or without straw. The NH4NO3 + straw plants had more mature leaves and greater leaf dry weight than the other two treatments. At an early stage (before 66 days), N concentration of Ca(NO3)2‐fed plants was less than with the other two treatments. The leaf K concentration and shoot K content of NH4NO3 and NH4NO3 + straw plants were more than with the Ca(NO3)2 treatment before maturity. Also, K concentration in mature leaves with these two treatments was greater than with Ca(NO3)2 treatment. All these results indicated that NH4NO3 application had benefits to the maturity and K accumulation in leaves of tobacco.
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Claims 7
Claim · model-written summary
Tobacco shoot dry mass did not differ significantly among treatments except at days 30 and 117.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- three treatmentse0
- Outcome
- shoot dry masse0
- Direction
- no significant differencese0
- Qualifier
- except at 30 and 117 days after transplantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“no significant differences in shoot dry mass of tobacco among the three treatments during the entire growth stage except at 30 and 117 days after transplanting”
Claim · model-written summary
At days 30 and 117, calcium nitrate gave less shoot biomass than ammonium nitrate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Ca(NO3)2 treatmente0
- Outcome
- shoot biomasse0
- Direction
- lesse0
- Comparator
- NH4NO3 with or without strawe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“shoot biomass with the Ca(NO3)2 treatment was significantly less than that with NH4NO3 with or without straw”
Claim · model-written summary
Ammonium nitrate plus straw gave more mature tobacco leaves than the other treatments.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- NH4NO3 + strawe0
- Outcome
- mature leavese0
- Direction
- moree0
- Comparator
- the other two treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“The NH4NO3 + straw plants had more mature leaves and greater leaf dry weight than the other two treatments”
Claim · model-written summary
Ammonium nitrate plus straw increased tobacco leaf dry weight relative to the other treatments.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- NH4NO3 + strawe0
- Outcome
- leaf dry weighte0
- Direction
- greatere0
- Comparator
- the other two treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“The NH4NO3 + straw plants had more mature leaves and greater leaf dry weight than the other two treatments”
Claim · model-written summary
Before day 66, calcium nitrate fed tobacco had lower N concentration.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Ca(NO3)2‐fed plantse0
- Outcome
- N concentratione0
- Direction
- lesse0
- Comparator
- the other two treatmentse0
Not reportedQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“N concentration of Ca(NO3)2‐fed plants was less than with the other two treatments”
Claim · model-written summary
Before maturity, ammonium nitrate treatments raised tobacco leaf K concentration and shoot K content.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- NH4NO3 and NH4NO3 + strawe0
- Outcome
- leaf K concentration and shoot K contente0
- Direction
- moree0
- Qualifier
- before maturitye0
- Comparator
- Ca(NO3)2 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“The leaf K concentration and shoot K content of NH4NO3 and NH4NO3 + straw plants were more than with the Ca(NO3)2 treatment before maturity”
Claim · model-written summary
Ammonium nitrate treatments gave greater K concentration in mature tobacco leaves than calcium nitrate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- these two treatmentse0
- Outcome
- K concentration in mature leavese0
- Direction
- greatere0
- Comparator
- Ca(NO3)2 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue‐Cured Tobacco”
e0“K concentration in mature leaves with these two treatments was greater than with Ca(NO3)2 treatment”
The same questions in other papers
calcium atom · growth · Nicotiana tabacum (tobacco)Results differ
2 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.