Abstract
Abstract Tobacco ( Nicotiana tabacum L.) cultivars containing a mammoth gene have not been evaluated at leaf numbers greater than 18 to 20 leaves per plant. In addition, they have not been evaluated with respect to potential for mechanical topping. Flue‐cured tobacco cultivar NC 22NF containing the mammoth gene, was grown in 1982, 1983, and 1984 at Blackstone, VA. Plants were topped (apical meristem removed) to determine the effect of leaf number per plant on yield, grade index, and leaf chemistry at constant soil fertility. Leaves remaining on the plant after topping were 14, 18, 22, and 26 per plant. Yield increased with leaf number. This study demonstrated that the accepted practice of topping at 18 to 20 leaves may be extended to 26 leaves, increasing yield and value with no detrimental alteration in leaf chemistry or decline in leaf grade index. The lack of difference in grade index compared to earlier studies may be due to the different genomes. In a duplicate set of treatments, four additional leaves per plant were allowed to develop before being removed to study the effects on yield, grade index, and leaf chemistry at 14, 18, 22, and 26 leaves per plant. The delay in topping until four additional leaves were produced did not significantly decrease yield, grade index, or leaf chemistry and may be advantageous for mechanical topping.
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Claims 3
Claim · model-written summary
Yield increased with leaf number.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- leaf numbere0
- Outcome
- Yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“Yield increased with leaf number.”
Claim · model-written summary
Topping at 26 leaves increased yield and value without damaging leaf chemistry or grade index.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- 26 leavese0
- Outcome
- yield and valuee0
- Direction
- increasinge0
- Comparator
- 18 to 20 leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“topping at 18 to 20 leaves may be extended to 26 leaves, increasing yield and value with no detrimental alteration in leaf chemistry or decline in leaf grade index”
Claim · model-written summary
Delayed topping did not significantly decrease yield, grade index, or leaf chemistry.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- delay in topping until four additional leaves were producede0
- Outcome
- yield, grade index, or leaf chemistrye0
- Direction
- did not significantly decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“The delay in topping until four additional leaves were produced did not significantly decrease yield, grade index, or leaf chemistry”
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pruning · yield · Nicotiana tabacum (tobacco)Positive and negative results
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