Data/hora: 24/06/2024 15:01:18

Biblioteca(s): | Embrapa Soja.
Data corrente: | 21/05/1993
Data da última atualização: | 26/10/2004
Autoria: | COOPER, R. L.
Afiliação: | USDA-ARS, Department of Agronomy, Ohio Agricultural Research and Development Center. The Ohio State University, Wooster, Ohio 44691, USA.
Título: | Breeding soybean cultivars with specific adaptation to the yield extremes.
Ano de publicação: | 1989
Fonte/Imprenta: | In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.
Volume: | t.2
Páginas: | p.895-900.
Idioma: | Inglês
Conteúdo: | Higher seed yield is a primary objective in most soybean breeding programs. An average of several studies conducted in the U.S. (Luedders-1977, Wilcox et al.-1979, Boerma-1979, Specht and Williams-1984) indicated soybean yields have been increased 15.1 kg/ha/year or 0.6%/year over the past 50 years due to improved cultivars (Fehr, 1987). However, continued improvement in yields have become increasingly more difficult due to the lodging barrier to higher soybean yields (Cooper, 1971a, 1981b). In a study in central Illinois in 1967, on highly productive land (13,000 kg/ha maize yields), the then popular cultivars reached a plant height of nearly 1,5 meters before they became severely lodged due to a rain storm. Subsequent research confirmed that potential yieldswere reduced by 21% (4,700 vc 3,700 kg/ha) by lodging at the early seed fill stage (cooper, 1971a). It was evident that cultivars that had been selected for lower yielding environments produced too much vegetative growth for this highly productive environment and that shorter, more lodging resistant cultivars were needed.
Palavras-Chave: | EUA; Soybean; USA.
Thesagro: | Melhoramento; Soja.
Thesaurus Nal: | breeding.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)