Abstract
Abstract Experiments were conducted in 1999 and 2000 to investigate the effect of uniformity of seedling emergence on the percentage of usable tobacco transplants produced in a greenhouse float system. Uneven seedling emergence was facilitated by staggering seeding date in randomly selected cells within a 288-cell tray. Treatments included seeding all cells on day 1 (control) and seeding 75% of the cells on day 1 and 25% seeded on day 5, 7, or 12 (in 1999) and day 3 or 5 (in 2000); other staggered seeding combinations also were investigated. Seedling emergence was measured until maximum emergence was observed. Fifty days after initial seeding, total plant stand, number of usable transplants, stem length, fresh weight, and dry weight were determined. A sample of 10 seedlings, based upon the percentage of usable and non-usable transplants from an individual tray, was used to determine stem length, fresh weight, and dry weight measurements. In both years, delayed seeding resulted in slower and less uniform seedling emergence than was observed in the control. Total plant stand at day 50 was similar among treatments, but the percentage of usable transplants was reduced by delayed seeding. A 3 or 5-day delay in the seeding of 25% of the cells reduced the percentage of usable transplants. In 1999, the control treatment produced 76% usable transplants compared to only 59% usable transplants when 25% of the cells were seeded at day 5. In 2000, transplant usability for the control was 91% compared to 85% and 78% usable transplants for the 3- and 5-day delayed seeding treatments. Reduced usability occurred even though the seedlings were clipped according to recommended practices. Thus, uniform emergence is critical in obtaining the maximum percentage of usable transplants.
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Claims 7
Claim · model-written summary
Delayed seeding resulted in slower and less uniform seedling emergence than the control
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- delayed seedinge1
- Outcome
- seedling emergencee1
- Direction
- slower and less uniforme1
- Comparator
- controle1
- Setting
- greenhouse float systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e1“In both years, delayed seeding resulted in slower and less uniform seedling emergence than was observed in the control”
Claim · model-written summary
Total plant stand at day 50 was similar among treatments
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- delayed seedinge2
- Outcome
- Total plant stande2
- Direction
- similare2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e2“Total plant stand at day 50 was similar among treatments, but the percentage of usable transplants was reduced by delayed seeding”
Claim · model-written summary
Delayed seeding reduced the percentage of usable transplants
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- delayed seedinge2
- Outcome
- percentage of usable transplantse2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e2“Total plant stand at day 50 was similar among treatments, but the percentage of usable transplants was reduced by delayed seeding”
Claim · model-written summary
In 1999 seeding 25% of cells at day 5 lowered usable transplants from 76% in the control to 59%
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- when 25% of the cells were seeded at day 5e3
- Outcome
- usable transplantse3
- Direction
- lowerinferrede3
- Value
- 59%e3
- Qualifier
- 76%e3
- Comparator
- the control treatmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e3“In 1999, the control treatment produced 76% usable transplants compared to only 59% usable transplants when 25% of the cells were seeded at day 5”
Claim · model-written summary
In 2000 a 3-day delay in seeding 25% of cells lowered usable transplants to 85% against 91% in the control
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- 3- and 5-day delayed seeding treatmentse4
- Outcome
- usable transplantse4
- Direction
- lowerinferrede4
- Value
- 85%e4
- Qualifier
- 91%e4
- Comparator
- the controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e4“In 2000, transplant usability for the control was 91% compared to 85% and 78% usable transplants for the 3- and 5-day delayed seeding treatments”
Claim · model-written summary
In 2000 a 5-day delay in seeding 25% of cells lowered usable transplants to 78% against 91% in the control
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- 3- and 5-day delayed seeding treatmentse4
- Outcome
- usable transplantse4
- Direction
- lowerinferrede4
- Value
- 78%e4
- Qualifier
- 91%e4
- Comparator
- the controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e4“In 2000, transplant usability for the control was 91% compared to 85% and 78% usable transplants for the 3- and 5-day delayed seeding treatments”
Claim · model-written summary
Uniform emergence is critical for the maximum percentage of usable tobacco transplants
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- maximum percentage of usable transplantse5
- Qualifier
- uniform emergence is criticale5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“usable tobacco transplants produced in a greenhouse float system”
e5“Thus, uniform emergence is critical in obtaining the maximum percentage of usable transplants”
The same questions in other papers
sowing time · growth · Nicotiana tabacum (tobacco)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
4 papers more in this group
See all 8 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.