Abstract
Hybrid sunflowers (Helianthus annuus L.) have rapidly replaced open-pollinated cultivars in the United States in the past 5 yr. Because of differential performance or economic considerations, hybrids of several other crops are grown at different plant populations than the standard cultivars that they replaced. This study was conducted to ascertain whether previous recommendations at plant populations for open-pollinated cultivars are appropriate for hybrids. The performance of three hybrids was compared with the major open-pollinated cv. Peredovik, at plant populations of 36,000, 48,000, and 72,000 plants/ha over 3 yr, 1973–1975. A nonsignificant cultivar × population interaction indicated that the three hybrids and Peredovik responded similarly to changes in plant population for each of the 3 yr of testing. Yield, oil content, and test weight were not significantly altered by the three plant populations evaluated. As plant population increased, head size and seed weight decreased and plant height of the hybrids and days to flowering increased. It was concluded that plant population recommendations for Peredovik of about 48,000 plants/ha are also appropriate for the growing of hybrids.
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Claims 5
Claim · model-written summary
Hybrid and Peredovik responses to plant population were similar across three years.
Verbatim
e0“A nonsignificant cultivar × population interaction indicated that the three hybrids and Peredovik responded similarly to changes in plant population for each of the 3 yr of testing”
Claim · model-written summary
Yield, oil content, and test weight did not significantly change across the three plant populations.
- Taxon
- SUNFLOWER
Helianthus annuust0 - Treatment
- three plant populationse0
- Outcome
- Yield, oil content, and test weighte0
- Direction
- not significantly alterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SUNFLOWER”
e0“Yield, oil content, and test weight were not significantly altered by the three plant populations evaluated”
Claim · model-written summary
Increasing plant population decreased sunflower head size and seed weight.
- Taxon
- SUNFLOWERHelianthus annuust0
- Treatment
- plant populatione0
- Outcome
- head size and seed weighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SUNFLOWER”
e0“As plant population increased, head size and seed weight decreased”
Claim · model-written summary
Increasing plant population increased hybrid height and days to flowering.
- Taxon
- SUNFLOWERHelianthus annuust0
- Material
- hybridse0
- Treatment
- plant populatione1
- Outcome
- plant height of the hybrids and days to floweringe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SUNFLOWER”
e0“plant height of the hybrids and days to flowering increased”
e1“As plant population increased”
Claim · model-written summary
The authors recommend about 48,000 plants/ha for sunflower hybrids, as for Peredovik.
- Taxon
- SUNFLOWERHelianthus annuust0
- Material
- hybridse0
- Outcome
- plant population recommendationse0
- Value
- about 48,000 plants/hae0
- Comparator
- Peredovike0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SUNFLOWER”
e0“plant population recommendations for Peredovik of about 48,000 plants/ha are also appropriate for the growing of hybrids”