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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
09/04/1997 |
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Data da última atualização: |
09/04/1997 |
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Autoria: |
TOLLENAAR, M.; DIBO, A. A.; AGUILERA, S. F.; SWANTON, C. J. |
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Título: |
Effect of crop density on weed interfernce in maize. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
Agronomy Journal, 86(4):591-595, 1994. |
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Idioma: |
Inglês |
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Conteúdo: |
Development of an integrated weed management system requires detailed information on crop-weed interactions, including the impact of the relative competitive ability of the crop during various phases of development on weed growth. The objective of this study was to auntify effects of maize (Zea mays L.) plant density on weed interference in maize throughout the growing season. Experiments were carried out during 1990, 1991 and 1992 at the Elora Research Station, Elora, ON, on a London loam (Aquic Hapludalf) soil that had been tile drained. Maize was grown at three plant densities (4,7, and 10 plants m-2) under three weed pressures. Weed pressures were established by varying the weed-free period after maize planting: all season (weed free), planting to 5 to 7-leaf stage of maize (medium weed pressure), and planting to 3 to 4-leaf stage of maize (high weed pressure). Maize and weed biomass and composition were evaluated at 3 wk presilking, silking, 3 wk post-silking, and at physiological maturity. Maize leaf area index, leaf chiorophyll content, and photosynthetic photon flux density transmittance with and without weeds were also measured. Increasing maize plant density from 4 to 10 plants m-2 reduced weed biomass by up to 50%. The impact of high weed-pressure treatments on maize dry matter accumulation remained in a narrow range of 18 to 21% throughout the growing season. |
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Palavras-Chave: |
Manejo integrado; Planta daninha; Zea mays L. |
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Thesagro: |
Milho. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01911naa a2200205 a 4500
001 1054627
005 1997-04-09
008 1994 bl --- 0-- u #d
100 1 $aTOLLENAAR, M.
245 $aEffect of crop density on weed interfernce in maize.
260 $c1994
520 $aDevelopment of an integrated weed management system requires detailed information on crop-weed interactions, including the impact of the relative competitive ability of the crop during various phases of development on weed growth. The objective of this study was to auntify effects of maize (Zea mays L.) plant density on weed interference in maize throughout the growing season. Experiments were carried out during 1990, 1991 and 1992 at the Elora Research Station, Elora, ON, on a London loam (Aquic Hapludalf) soil that had been tile drained. Maize was grown at three plant densities (4,7, and 10 plants m-2) under three weed pressures. Weed pressures were established by varying the weed-free period after maize planting: all season (weed free), planting to 5 to 7-leaf stage of maize (medium weed pressure), and planting to 3 to 4-leaf stage of maize (high weed pressure). Maize and weed biomass and composition were evaluated at 3 wk presilking, silking, 3 wk post-silking, and at physiological maturity. Maize leaf area index, leaf chiorophyll content, and photosynthetic photon flux density transmittance with and without weeds were also measured. Increasing maize plant density from 4 to 10 plants m-2 reduced weed biomass by up to 50%. The impact of high weed-pressure treatments on maize dry matter accumulation remained in a narrow range of 18 to 21% throughout the growing season.
650 $aMilho
653 $aManejo integrado
653 $aPlanta daninha
653 $aZea mays L
700 1 $aDIBO, A. A.
700 1 $aAGUILERA, S. F.
700 1 $aSWANTON, C. J.
773 $tAgronomy Journal, 86(4):591-595, 1994.
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Embrapa Meio-Norte (CPAMN) |
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| 9. |  | SILVA, D. C. P. da; RIBEIRO, P. P. E.; MILORI, D. M.; FERREIRA, E. J.; JORGE, L. A. de C. Geração de um classificador para detecção precoce do HLB em citros. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 2., 2010, São Carlos, SP. Anais... São Carlos: Embrapa Instrumentação Agropecuária: Embrapa Pecuária Sudeste, 2010. p. 85. (Embrapa Instrumentação Agropecuária. Documentos, 50).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 14. | | MARTUSCELLO, J. A.; JANK, L.; GONTIJO NETO, M. M.; LAURA, V. A.; CUNHA, D. de N. F. V. da. Produção de gramíneas do gênero Brachiaria sob níveis de sombreamento. Revista Brasileira de Zootecnia, Viçosa, MG, v. 38, n.7, p. 1183-1190, jul. 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
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| Registros recuperados : 18 | |
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