Abstract
Abstract Studies in southeastern Pennsylvania utilizing two recommended varieties of Type 41, Pennsylvania broadleaf, tobacco indicated that conventional plant populations (13,000 to 15,000 per ha) may be too low for optimum yield of cured leaf. While leaf area per plant decreased as population increased, the decrease was more than compensated for by the increased number of plants. In 1965, nearly normal as regards precipitation, leaf area indices (leaf area/unit land area) just prior to harvest were, respectively, 5.54, 6.14, and 8.10 for 10,500, 14,600, and 20,900 plants/ha. Leaves were more erect at the high population than at the other two populations studied. In 1966, a relatively dry year with precipitation 56% of normal, leaf area indices were, respectively, 2.30, 3.68, and 5.32 for 9,000, 16,100, and 24,600 plants/ha. At all populations, leaves were less erect in 1966 than in 1965. Leaf quality was not significantly affected by plant population. Both total yield of cured leaf and gross cash return increased as population increased.
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Claims 9
Claim · model-written summary
Conventional tobacco density may be too low for optimum cured leaf yield.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Outcome
- optimum yield of cured leafe0
- Qualifier
- 13,000 to 15,000 per hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conventional plant populations (13,000 to 15,000 per ha) may be too low for optimum yield of cured leaf”
t0“Tobacco”
Claim · model-written summary
Leaf area per tobacco plant declined as population increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- populatione0
- Outcome
- leaf area per plante0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf area per plant decreased as population increased”
t0“Tobacco”
Claim · model-written summary
In 1965, tobacco leaf area index rose across the three plant densities, reaching 8.10 at 20,900 plants per hectare.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- 20,900 plants/hae0
- Outcome
- leaf area indicese0
- Value
- 8.10e0
- Qualifier
- In 1965e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1965, nearly normal as regards precipitation, leaf area indices (leaf area/unit land area) just prior to harvest were, respectively, 5.54, 6.14, and 8.10 for 10,500, 14,600, and 20,900 plants/ha”
t0“Tobacco”
Claim · model-written summary
Leaves were more erect at high density.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- high populatione0
- Outcome
- Leavese0
- Direction
- more erecte0
- Comparator
- other two populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves were more erect at the high population than at the other two populations studied”
t0“Tobacco”
Claim · model-written summary
In dry 1966, tobacco leaf area index reached 5.32 at 24,600 plants per hectare.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- 24,600 plants/hae0
- Outcome
- leaf area indicese0
- Value
- 5.32e0
- Qualifier
- a relatively dry year with precipitation 56% of normale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1966, a relatively dry year with precipitation 56% of normal, leaf area indices were, respectively, 2.30, 3.68, and 5.32 for 9,000, 16,100, and 24,600 plants/ha”
t0“Tobacco”
Claim · model-written summary
Tobacco leaves were less erect in 1966 than 1965 at every density.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- leavese0
- Direction
- less erecte0
- Comparator
- 1965e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all populations, leaves were less erect in 1966 than in 1965”
t0“Tobacco”
Claim · model-written summary
Plant density did not significantly affect tobacco leaf quality.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- plant populatione0
- Outcome
- Leaf qualitye0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf quality was not significantly affected by plant population”
t0“Tobacco”
Claim · model-written summary
Tobacco cured leaf yield increased with population.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- populatione0
- Outcome
- total yield of cured leafe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both total yield of cured leaf and gross cash return increased as population increased”
t0“Tobacco”
Claim · model-written summary
Tobacco gross cash return increased with population.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- populatione0
- Outcome
- gross cash returne0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both total yield of cured leaf and gross cash return increased as population increased”
t0“Tobacco”
The same questions in other papers
density · quality: general · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.