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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

IRRIGATION REQUIREMENTS ARE LOWER THAN THOSE USUALLY PRESCRIBED FOR A MAIZE CROP IN SOUTHERN BRAZIL

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: 17/20925-0 - Brazilian yield-gap atlas: assessing the potential for sustainable intensification of Brazilian agriculture
Grantee:Fabio Ricardo Marin
Support type: 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 type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
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 type: Scholarships in Brazil - Scientific Initiation
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 type: Research Program on Global Climate Change - Regular Grants
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 type: Scholarships in Brazil - Master