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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
21/05/1993 |
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Data da última atualização: |
26/10/2004 |
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Autoria: |
COOPER, R. L. |
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Afiliação: |
USDA-ARS, Department of Agronomy, Ohio Agricultural Research and Development Center. The Ohio State University, Wooster, Ohio 44691, USA. |
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Título: |
Breeding soybean cultivars with specific adaptation to the yield extremes. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989. |
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Volume: |
t.2 |
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Páginas: |
p.895-900. |
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Idioma: |
Inglês |
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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. |
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Palavras-Chave: |
EUA; Soybean; USA. |
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Thesagro: |
Melhoramento; Soja. |
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Thesaurus Nal: |
breeding. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01691naa a2200217 a 4500
001 1451977
005 2004-10-26
008 1989 bl uuuu u00u1 u #d
100 1 $aCOOPER, R. L.
245 $aBreeding soybean cultivars with specific adaptation to the yield extremes.
260 $c1989
300 $ap.895-900. t.2
490 $vt.2
520 $aHigher 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.
650 $abreeding
650 $aMelhoramento
650 $aSoja
653 $aEUA
653 $aSoybean
653 $aUSA
773 $tIn: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.
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Registro original: |
Embrapa Soja (CNPSO) |
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