Data/hora: 21/06/2024 13:14:45

Biblioteca(s): | Embrapa Solos.
Data corrente: | 16/12/2019
Data da última atualização: | 16/12/2019
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.
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.
Título: | Irrigation requirements are lower than those usually prescribed for a maize crop in Southern Brazil.
Ano de publicação: | 2019
Fonte/Imprenta: | Experimental Agriculture, v. 55, n. 4, p. 662-671, Aug. 2019.
DOI: | 10.1017/S0014479718000339
Idioma: | Inglês
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.
Thesagro: | Evapotranspiração; Irrigação; Milho.
Thesaurus Nal: | Evapotranspiration; Irrigation; Zea mays subsp. mays.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (20375-1) - UPC - AP - DD -  -  - 2019.00283 - DIS