Abstract
Abstract Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited. The objectives of these field studies were: (i) to acquire information on seed yield and other agronomic characteristics of two semidwarf and two standard‐height sunflower hybrids; and (ii) to determine an optimum plant population for hybrids representing both plant types. Two experimental semidwarf (SD) and two standard‐height (SH) hybrids of similar maturity from Cargill and Sigco research breeding programs were grown at populations of 32 123,49 420,66 717,84 014, and 101 311 plants/ ha over a 3‐yr period (1982‐1984) under dryland conditions at Fargo, Carrington, and Prosper, ND. Yield differences were observed dependent on the hybrid but not on plant type. The Cargill SD and Cargill SH genotypes had similar but higher yields than both 894 SH, a commonly grown hybrid, and Sigco SD, which were not significantly different from each other. Yield differences among hybrids were the consequence of differences in seed weight and seed per head. Cargill SH had the highest oil percentage and test weight. It was concluded that the semidwarf hybrids did not possess any yield superiority when compared to the two standard‐height sunflower hybrids. A plant population of 32 123 plants/ha resulted in the highest yield for hybrids representing both plant types. Plant populations above 32 123 plants/ha decreased yield, seed weight, seed per head, and head diameter, but increased percent oil.
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Claims 9
Claim · model-written summary
Yield differences in semidwarf sunflower depended on hybrid but not on plant type
- Taxon
- sunflower
Helianthus annuuse0 - Outcome
- Yield differencese1
- Qualifier
- dependent on the hybrid but not on plant typee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e1“Yield differences were observed dependent on the hybrid but not on plant type”
Claim · model-written summary
Cargill SD and Cargill SH sunflower genotypes had similar but higher yields than 894 SH
- Taxon
- sunflowerHelianthus annuuse0
- Material
- Cargill SD and Cargill SH genotypese2
- Outcome
- yieldse2
- Direction
- highere2
- Comparator
- 894 SHe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e2“The Cargill SD and Cargill SH genotypes had similar but higher yields than both 894 SH, a commonly grown hybrid, and Sigco SD, which were not significantly different from each other”
Claim · model-written summary
Yield differences among sunflower hybrids were due to differences in seed weight and seeds per head (author interpretation)
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- Yield differences among hybridse3
- Qualifier
- differences in seed weight and seed per heade3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e3“Yield differences among hybrids were the consequence of differences in seed weight and seed per head”
Claim · model-written summary
Cargill SH sunflower had the highest oil percentage and test weight
- Taxon
- sunflowerHelianthus annuuse0
- Material
- Cargill SHe4
- Outcome
- oil percentage and test weighte4
- Direction
- higheste4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e4“Cargill SH had the highest oil percentage and test weight”
Claim · model-written summary
Semidwarf sunflower hybrids showed no yield superiority over two standard-height hybrids
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- semidwarf hybridse5
- Outcome
- yield superioritye5
- Direction
- no_changeinferrede5
- Comparator
- standard‐height sunflower hybridse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e5“It was concluded that the semidwarf hybrids did not possess any yield superiority when compared to the two standard‐height sunflower hybrids”
Claim · model-written summary
A plant population of 32 123 plants/ha gave the highest yield for hybrids of both plant types
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- plant population of 32 123 plants/hae6
- Outcome
- yielde6
- Direction
- higheste6
- Setting
- dryland conditions at Fargo, Carrington, and Prosper, NDe7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e6“A plant population of 32 123 plants/ha resulted in the highest yield for hybrids representing both plant types”
e7“under dryland conditions at Fargo, Carrington, and Prosper, ND”
Claim · model-written summary
Plant populations above 32 123 plants/ha decreased yield, seed weight and seed per head
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Plant populations above 32 123 plants/hae7
- Outcome
- yield, seed weight, seed per heade7
- Direction
- decreasede7
- Comparator
- 32 123 plants/hae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e7“Plant populations above 32 123 plants/ha decreased yield, seed weight, seed per head, and head diameter, but increased percent oil”
Claim · model-written summary
Plant populations above 32 123 plants/ha decreased head diameter
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Plant populations above 32 123 plants/hae7
- Outcome
- head diametere7
- Direction
- decreasede7
- Comparator
- 32 123 plants/hae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e7“Plant populations above 32 123 plants/ha decreased yield, seed weight, seed per head, and head diameter, but increased percent oil”
Claim · model-written summary
Plant populations above 32 123 plants/ha increased percent oil
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Plant populations above 32 123 plants/hae7
- Outcome
- percent oile7
- Direction
- increasede7
- Comparator
- 32 123 plants/hae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information on yield and agronomic performance of semidwarf sunflower ( Helianthus annuus L.) is limited”
e7“Plant populations above 32 123 plants/ha decreased yield, seed weight, seed per head, and head diameter, but increased percent oil”
The same questions in other papers
density · yield · Helianthus annuus (common sunflower)Positive and negative results
69 papers in the same direction as this paper · 15 in the opposite direction
- negative
- no effect
- negative
81 papers more in this group
See all 85 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.