Abstract
Abstract Yields of tobacco ( Nicotiana tabacum L.) on three Ultisols in Puerto Rico increased with liming up to about pH 5.0. There was a highly significant inverse relationship between yield and exchangeable Al. Maximum yield was generally reached as exchangeable Al approached 0 and at base saturation values of around 60%. Yields on an Oxisol increased with liming to about the same pH and base saturation level, although only traces of exchangeable Al were found. Leaf analysis indicated that Mn toxicity was a probable factor in the Oxisol. Tobacco root growth, studied in one of the Ultisols, was directly affected by low soil pH. Al toxicity appeared to be the chief cause of restricted growth but Ca deficiency was a possible contributing factor.
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Claims 8
Claim · model-written summary
Tobacco yield on three Ultisols rose with liming to about pH 5.0.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- liminge0
- Outcome
- Yieldse0
- Direction
- increasede0
- Qualifier
- up to about pH 5.0e0
- Setting
- Puerto Ricoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of tobacco ( Nicotiana tabacum L.) on three Ultisols in Puerto Rico increased with liming up to about pH 5.0.”
Claim · model-written summary
Tobacco yield had a highly significant inverse relationship with exchangeable Al.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- exchangeable Ale0
- Outcome
- yielde0
- Direction
- inversee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a highly significant inverse relationship between yield and exchangeable Al.”
t0“Tobacco”
Claim · model-written summary
Maximum tobacco yield generally coincided with exchangeable Al near zero and base saturation around 60%.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- exchangeable Ale0
- Outcome
- yielde0
- Direction
- Maximume0
- Qualifier
- base saturation values of around 60%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum yield was generally reached as exchangeable Al approached 0 and at base saturation values of around 60%.”
t0“Tobacco”
Claim · model-written summary
Oxisol tobacco yields rose with liming to about the same pH and base saturation.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- liminge0
- Outcome
- Yieldse0
- Direction
- increasede0
- Qualifier
- Oxisole0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields on an Oxisol increased with liming to about the same pH and base saturation level”
t0“Tobacco”
Claim · model-written summary
Leaf analysis suggested Mn toxicity was a probable factor in the Oxisol.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- Leafe0
- Compound
- Mne0
- Outcome
- Mn toxicitye0
- Qualifier
- probable factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf analysis indicated that Mn toxicity was a probable factor in the Oxisol.”
t0“Tobacco”
Claim · model-written summary
Low soil pH directly affected tobacco root growth in one Ultisol.
- Taxon
- TobaccoNicotiana tabacume0
- Outcome
- root growthe0
- Qualifier
- low soil pHe0
- Setting
- Ultisolse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco root growth, studied in one of the Ultisols, was directly affected by low soil pH.”
Claim · model-written summary
Al toxicity appeared to be the chief cause of restricted root growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- Ale0
- Outcome
- restricted growthe0
- Qualifier
- chief causee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al toxicity appeared to be the chief cause of restricted growth”
t0“Tobacco”
Claim · model-written summary
Ca deficiency may have contributed to restricted root growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- Cae0
- Outcome
- Ca deficiencye0
- Qualifier
- possible contributing factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca deficiency was a possible contributing factor.”
t0“Tobacco”
The same questions in other papers
lime · yield · Nicotiana tabacum (tobacco)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 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.