Year: 1978
Type: article
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.
DOI: 10.4141/cjps78-093
Authors: J. F. MILLER, G. N. FICK
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2071939605