Abstract
Abstract Leaf removal studies were conducted on sunflowers ( Helianthus annuus L.) from 1969 through 1971 at Experiment, Georgia, to evaluate the amount of leaf damage sunflower plants can tolerate without yield losses. Leaves from sunflower plants were artificially removed at levels ranging from none to all prior to flowering. Sunflower seed yields were significantly reduced as a result of partial or complete leaf excision when compared with the undefoliated check. Yields were affected least when leaves 5 through 12 from the top or the top 12 were left on the sunflower plants. Lowest leaves on the plant were more important to seed yield than when only top 4 were left. The oil percent of seed was not affected by defoliation treatments when eight or more leaves remained on plants. Complete and partial leaf removal treatments reduced both seed weight and head diameter compared with the undefoliated check.
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Claims 8
Claim · model-written summary
Partial leaf excision significantly reduced sunflower seed yield relative to undefoliated plants.
- Taxon
- Sunflower
Helianthus annuuse0 - Treatment
- partial or complete leaf excisione0
- Outcome
- seed yieldse0
- Direction
- reducede0
- Comparator
- undefoliated checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sunflower seed yields were significantly reduced as a result of partial or complete leaf excision when compared with the undefoliated check”
Claim · model-written summary
Complete leaf excision significantly reduced sunflower seed yield relative to undefoliated plants.
- Taxon
- SunflowerHelianthus annuuse0
- Treatment
- complete leaf excisione0
- Outcome
- seed yieldse0
- Direction
- reducede0
- Comparator
- undefoliated checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sunflower seed yields were significantly reduced as a result of partial or complete leaf excision when compared with the undefoliated check”
Claim · model-written summary
Yield was least affected when leaves 5 through 12 from the top remained.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- leaves 5 through 12 from the tope0
- Outcome
- Yieldse0
- Direction
- affected leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were affected least when leaves 5 through 12 from the top or the top 12 were left on the sunflower plants”
Claim · model-written summary
Yield was least affected when the top 12 leaves remained.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- top 12e0
- Outcome
- Yieldse0
- Direction
- affected leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were affected least when leaves 5 through 12 from the top or the top 12 were left on the sunflower plants”
Claim · model-written summary
Lowest leaves contributed more to seed yield than retaining only the top four leaves.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- Lowest leavese0
- Outcome
- seed yielde0
- Direction
- more importante0
- Comparator
- top 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lowest leaves on the plant were more important to seed yield than when only top 4 were left”
t0“Sunflower”
Claim · model-written summary
Defoliation did not affect seed oil percentage when at least eight leaves remained.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- defoliation treatmentse0
- Outcome
- oil percent of seede0
- Direction
- not affectede0
- Qualifier
- eight or more leaves remainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The oil percent of seed was not affected by defoliation treatments when eight or more leaves remained on plants”
t0“Sunflower”
Claim · model-written summary
Complete leaf removal reduced seed weight and head diameter.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Complete and partial leaf removal treatmentse0
- Outcome
- seed weight and head diametere0
- Direction
- reducede0
- Comparator
- undefoliated checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Complete and partial leaf removal treatments reduced both seed weight and head diameter compared with the undefoliated check”
t0“Sunflower”
Claim · model-written summary
Partial leaf removal reduced seed weight and head diameter.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- partial leaf removal treatmentse0
- Outcome
- seed weight and head diametere0
- Direction
- reducede0
- Comparator
- undefoliated checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Complete and partial leaf removal treatments reduced both seed weight and head diameter compared with the undefoliated check”
t0“Sunflower”
The same questions in other papers
pruning · yield · Helianthus annuus (common sunflower)Results differ
6 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- negative
7 papers more in this group
See all 11 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.