| Full text | |
| Author(s): |
Sobenko, Luiz R.
[1]
;
Souza, Tamires T.
[1]
;
Goncalves, Alexandre O.
[1]
;
Bianchini, Vitor J. M.
[1]
;
Silva, Evandro H. E. M.
[1]
;
Souza, Lais T.
[1]
;
Marin, Fabio R.
[1]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Biosyst Engn Dept, Coll Agr Luiz de Queiroz ESALQ, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | EXPERIMENTAL AGRICULTURE; v. 55, n. 4, p. 662-671, AUG 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
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 mm d-1. (AU) | |
| FAPESP's process: | 16/17008-2 - Scenarios simulation agricultural futures for maize at the region of Piracicaba/SP based on climate change projections |
| Grantee: | Vitor de Jesus Martins Bianchini |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 16/06363-6 - Scenarios simulation agricultural futures for maize in Brazil based on climate change projections |
| Grantee: | Tamires Teles de Souza |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 17/20925-0 - Brazilian yield-gap atlas: assessing the potential for sustainable intensification of Brazilian agriculture |
| Grantee: | Fabio Ricardo Marin |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 14/50023-0 - Hydro-social and environmental impacts of sugarcane production on land use and food security: an international programme to foster trans-disciplinary science, networking and community building - THESIS |
| Grantee: | Fabio Ricardo Marin |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Regular Program Grants |
| FAPESP's process: | 14/12406-4 - Brazilian sugarcane yield-gap: current status and future projection based on climate, soil and water management changes |
| Grantee: | Fabio Ricardo Marin |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |