Abstract
Abstract Little work has been done investigating phosphorus (P) nutrition in tobacco seedling production. Three greenhouse experiments were conducted in 1993 and 1994 to determine the influence of P on seedling growth. Treatments consisted of fertilizers containing from 0 to 10% phosphorus. Growth parameters measured in all experiments included seedling dry weight, stem length, and tissue P concentration. Reducing P rate did not affect any growth parameters until the solution nitrogen (N): P ratio became less than 20: 1. The 0 P treatment did not produce any transplantable seedlings in two of three experiments. Final seedling usability was not affected as long as at least a 20: 1: 20 ratio fertilizer was used. Seedling growth in the field, as well as final leaf yield, was not affected by reducing P from 10% to 1%. Data suggest that previous greenhouse fertility recommendations contained excess phosphorus and should be reduced to at least a 20: 5: 20 ratio fertilizer.
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Claims 6
Claim · model-written summary
Reduced P did not affect seedling growth parameters until the solution N:P ratio fell below 20:1.
- Taxon
- tobacco seedlings
Nicotiana tabacumt0 - Treatment
- Reducing P ratee0
- Outcome
- growth parameterse0
- Direction
- did not affecte0
- Qualifier
- solution nitrogen (N): P ratio became less than 20: 1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reducing P rate did not affect any growth parameters until the solution nitrogen (N): P ratio became less than 20: 1.”
t0“tobacco seedlings”
Claim · model-written summary
Zero P produced no transplantable seedlings in two of three experiments.
- Taxon
- tobacco seedlingsNicotiana tabacumt0
- Treatment
- 0 P treatmente0
- Outcome
- transplantable seedlingse0
- Direction
- did not producee0
- Qualifier
- in two of three experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 0 P treatment did not produce any transplantable seedlings in two of three experiments.”
t0“tobacco seedlings”
Claim · model-written summary
Seedling usability was maintained with at least a 20:1:20 fertilizer ratio.
- Taxon
- tobacco seedlingsNicotiana tabacumt0
- Treatment
- at least a 20: 1: 20 ratio fertilizere0
- Outcome
- Final seedling usabilitye0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Final seedling usability was not affected as long as at least a 20: 1: 20 ratio fertilizer was used.”
t0“tobacco seedlings”
Claim · model-written summary
Reducing P from 10% to 1% did not affect field seedling growth.
- Taxon
- tobacco seedlingsNicotiana tabacumt0
- Treatment
- reducing P from 10% to 1%e0
- Outcome
- Seedling growth in the fielde0
- Direction
- not affectede0
- Setting
- fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedling growth in the field, as well as final leaf yield, was not affected by reducing P from 10% to 1%.”
t0“tobacco seedlings”
Claim · model-written summary
Reducing P from 10% to 1% did not affect final leaf yield.
- Taxon
- tobacco seedlingsNicotiana tabacumt0
- Treatment
- reducing P from 10% to 1%e0
- Outcome
- final leaf yielde0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedling growth in the field, as well as final leaf yield, was not affected by reducing P from 10% to 1%.”
t0“tobacco seedlings”
Claim · model-written summary
The authors recommend reducing phosphorus in greenhouse fertilizer to at least a 20:5:20 ratio.
- Taxon
- tobacco seedlingsNicotiana tabacumt0
- Outcome
- should be reduced to at least a 20: 5: 20 ratio fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“previous greenhouse fertility recommendations contained excess phosphorus and should be reduced to at least a 20: 5: 20 ratio fertilizer”
t0“tobacco seedlings”
The same questions in other papers
phosphorus · growth · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
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See all 20 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.