Data/hora: 18/06/2024 02:46:50

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	26/10/1992	
Data da última atualização: 	28/10/2004	
Autoria: 	BRIGHAM, R. D.; YOUNG, J. K.	
Título: 	Genetic potential of dwarf sunflower hybrids in Texas.	
Ano de publicação: 	1985	
Fonte/Imprenta: 	In: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata. Actas. Mar del Plata : ASAGIR/ISA, 1985.	
Volume: 	t.2	
Páginas: 	p.787-788.	
Idioma: 	Inglês	
Conteúdo: 	Performance of a swarf hybrid was compared with normal height hybrids grown under irrigation in a replicated trial at Lubbock, Texas, in 1983 and 1984. Plant height plus stem diameter at the cotyledonary node were recorded at 14-day intervals for 10 plants/rep/entry. These parameters were recorded for the last time at or near maturity, and head diameter was recorded at threshing time. Seed yield/head and weitht/100 seeds were recorded for each of 10 heads after threshing. Plants of the dwarf hybrid (534 DW) were 18% and 29% shorter (1983 and 1984 respectively) than the average of the three normal height hybrids (SF101, 894A, and Sunbred 254; 120.7 vs 147.0 cm in  1983, and 93.3 vs 131.6 cm in 1984). Stem diameter of the dwarf hybrid was 1.3 mm and 2.4 mm smaller than the average of the normal height hybrids (18.2 vx 19.5 mm in 1983; 16.5 vs 18.9 mm in 1984). Head diameter at threshing was slightly less for the dwarf hybrid each year (17.5 vx 17.8 cm in 1983; 13.7 vs 14.0 cm in 1984). Yield of seed per head was also less for the dwarf hybrid each year (52.5 vs 76.0 g in 1983; 27.3 vs 36.7g in 1984). Weight/100 seed was slightly higher for the dwarf hybrid each year (5.5 vs 5.4g in 1983; 5.3 vs 4.3 g in 1984). Although short-statured dwarf hybrids have advantages in storm resistance, ease of cultivation, and efficiency of harvest, improvement in genetic potential for yield apparently needs to be made.	
Palavras-Chave: 	EUA; Genetic; Sunflower; USA.	
Thesagro: 	Genética; Girassol.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)