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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
16/12/2019 |
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Data da última atualização: |
16/12/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOBENKO, L. R.; SOUZA, T. T.; GONÇALVES, A. O.; BIANCHINI, V. J. M.; SILVA, E. H. F. M.; SOUZA, L. T.; MARIN, F. R. |
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Afiliação: |
LUIZ R. SOBENKO, ESALQ/USP; TAMIRES T. SOUZA, ESALQ/USP; ALEXANDRE ORTEGA GONCALVES, CNPS; VITOR J. M. BIANCHINI, ESALQ/USP; EVANDRO H. F. M. SILVA, ESALQ/USP; LAÍS T. SOUZA, ESALQ/USP; FÁBIO R. MARIN, ESALQ/USP. |
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Título: |
Irrigation requirements are lower than those usually prescribed for a maize crop in Southern Brazil. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Experimental Agriculture, v. 55, n. 4, p. 662-671, Aug. 2019. |
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DOI: |
10.1017/S0014479718000339 |
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Idioma: |
Inglês |
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Conteúdo: |
Due to the lack of basic information on water required by maize (Zea mays L.) in Brazil, the large amount of water applied usually exceeds crop requirements, wasting water and energy. In this study, we measured crop evapotranspiration (ETc) as evaporative heat flux from a centre pivot-irrigated maize plantation in Southern Brazil during winter and summer seasons, using the Bowen ratio method to evaluate how the degree of canopy-atmosphere coupling affects crop water needs and irrigation management. Irrigation requirements were determined by comparing ETc with reference evapotranspiration (ETo), derived from the Penman-Monteith equation and expressed as the ETc/ETo (Kc) ratio. In this study, the average Kc values obtained were 1.31 and 0.90 for the winter and summer, respectively. Using aerodynamic and canopy resistance measurements, the decoupling factor (Omega) was computed. Omega values tending to zero (0.09 and 0.20 for winter and summer, respectively) showed that strong coupling of maize plants to the atmosphere and sensitivity to high air temperatures, vapour pressure deficits and wind speed caused variations in Kc in relation to ETo ranges. During the experimental period, the Kc value ranged from 0.92 when the ETo exceeded 4 mm d-1 to 1.64 when the ETo was less than 2 mmd-1. |
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Thesagro: |
Evapotranspiração; Irrigação; Milho. |
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Thesaurus Nal: |
Evapotranspiration; Irrigation; Zea mays subsp. mays. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02134naa a2200277 a 4500
001 2116972
005 2019-12-16
008 2019 bl uuuu u00u1 u #d
024 7 $a10.1017/S0014479718000339$2DOI
100 1 $aSOBENKO, L. R.
245 $aIrrigation requirements are lower than those usually prescribed for a maize crop in Southern Brazil.$h[electronic resource]
260 $c2019
520 $aDue to the lack of basic information on water required by maize (Zea mays L.) in Brazil, the large amount of water applied usually exceeds crop requirements, wasting water and energy. In this study, we measured crop evapotranspiration (ETc) as evaporative heat flux from a centre pivot-irrigated maize plantation in Southern Brazil during winter and summer seasons, using the Bowen ratio method to evaluate how the degree of canopy-atmosphere coupling affects crop water needs and irrigation management. Irrigation requirements were determined by comparing ETc with reference evapotranspiration (ETo), derived from the Penman-Monteith equation and expressed as the ETc/ETo (Kc) ratio. In this study, the average Kc values obtained were 1.31 and 0.90 for the winter and summer, respectively. Using aerodynamic and canopy resistance measurements, the decoupling factor (Omega) was computed. Omega values tending to zero (0.09 and 0.20 for winter and summer, respectively) showed that strong coupling of maize plants to the atmosphere and sensitivity to high air temperatures, vapour pressure deficits and wind speed caused variations in Kc in relation to ETo ranges. During the experimental period, the Kc value ranged from 0.92 when the ETo exceeded 4 mm d-1 to 1.64 when the ETo was less than 2 mmd-1.
650 $aEvapotranspiration
650 $aIrrigation
650 $aZea mays subsp. mays
650 $aEvapotranspiração
650 $aIrrigação
650 $aMilho
700 1 $aSOUZA, T. T.
700 1 $aGONÇALVES, A. O.
700 1 $aBIANCHINI, V. J. M.
700 1 $aSILVA, E. H. F. M.
700 1 $aSOUZA, L. T.
700 1 $aMARIN, F. R.
773 $tExperimental Agriculture$gv. 55, n. 4, p. 662-671, Aug. 2019.
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Embrapa Solos (CNPS) |
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